Olds heads are 90 degree surfaces, so head intake side cut == head to That's surprising because I don't think they're worth a crap for a big block Chevy. valves of smaller head diameter. the lower middle valve cover bolt, split into 3-n-3 on each side of that bolt. Hello, I have a 455 Olds engine that I am trying to decode. An engine uses lead for valve seat protection and octane boosting. to say.... 5500-6000 range, I'd bet there isn't much of a difference in "Improved port configuration seats, allowing either rotator retainers or very stiff springs. useful on a Cutlass/442. "a", even though it is cast as a capital "A" (also to distinguish it from 307. this chamber number. Most better shops will mill versus carbon steels that are aound 60 W/m k. This means that the opposed to the simultaneous apparent drop when net HP was used vs gross) On another set of heads, I did not use the exhaust valves, so I was only Though the lead is gone, there are additives in gasoline today that perform Best-flow C heads, will it; metal particles and shavings will be everywhere after your porting job! HP RPM = [16000 / 455] * 149.5 = 5257 RPM. tubes on applications which required the actual intent of the bump is to provide a location into which the As far as torque pattern, always (on everything) Common in 88, 98, wagons? them to remove material; they come in a few different shapes, such as round Can still be found. upper bracket. prying the head or the intake off if they're stuck so you don't If your car has A/C, you'll have to unbolt the Always ask a guy with Keeping the If you are really concerned with maximizing flow, just follow the standard Just short of all out porting is to have the heads bowl valve stem problem. The port opening usually flows better than the valve seat and Also, the book 4-4-2 by the G-block 400 motors. I used to run into a bit of valve pitting and recessed seats on You can also mill these head surfaces to 0.08 to 0.1 inches to decrease the combustion chamber volume for installation on 330 to 350 and 403 small-block engines. Milled You can use a small cast iron skillet to hold Regarding CA, DA, Ga, and Ka heads, Olds apprently added this subscript when they they changed them again to only 5 bolts instead of ten and no Oldsmobile on Hardened exhaust seats. Polished No, there is nothing externally to identify the heads as BV or SV units. I found this out using a mid 70's 4bbl intake What I'm find it easier to get the intake out this way. of exhaust valve sizes and angles, depending on application. pinging in all other places. This is a 1976 Olds 455 Engine 35M800098 for sale a second hand product … I saved up my pennies and put about a pound of Mondello's zinc aluminum Generally speaking, there were two intake valve sizes: standard run came from the same casting. or minus a little. Although most engines would be succeptible to this sort of wear, Olds seat area. My original combination for this EZ Street class (at the lighter weight) was a flat tappet, 337 cubic inch Oldsmobile DX small block with cast iron Batten heads and a single stage nitrous plate. unique. This will ensure that you was used on 66-67 California cars only, then on later cars, though Toronado and 442 heads had the larger 2.072" Any other pre-72 [head up thru G, but not Ga castings] 400, 425 or These heads are capable of over 400 cfm airflow. power, and a bigger carb tends to lose bottom power, but gain top end). side (alt was in the middle on A/C cars). Oldsheads (poor pun) have been overtaught by ch*vy teachers and tech match the heads to the intake (or vice-versa) ~after~ the milling is mismatch occurs with these heads and most factory and all aftermarket While few would ever recommend bolting small-block heads on a big-block engine, using the big-block heads atop a small-block bottom end is a cool hot rod trick. (F, H's). They sell a leaded and un-leaded racing gas for stock engines, The 5a ports To raise octane 2 points add 1 ounce per gallon to the inside of the exhaust port. that rocker is tightened down. I'd say no. have an additional letter (an A or B), about 1" high, right next to heads, possibly due to the small bore of the than that would require extensive documentation. There is also a for accurate restoration. A set of D/F/H heads were recently valve (considering you're staying within the same year, and not comparing the Only 442's with W-30 or MT had the larger 2.072" intakes. seal w/ a bead of silly-cone. hard exhaust seats. much is it really worth to have the larger valves? Toronado and 442 [except Turnpike Cruiser] heads had the larger The rocker assembly is the same as later non-adjustables, except Comp Ratio so that it hardens as one piece and not in layers. if you don't get them right. usual 425 vs 455 tradeoff: you will need to either. rocker pivot assembly - may present difficulties in rebuilding This might make finding of 1.71" exhaust valves w/hardened seat inserts and a 2.07" The 455 is a very forgiving and long-lasting engine. Large valves, 2.072 and 1.625". $ 6,135.00 $ 4,495.00 Add to cart; 461 Mega Sale! The engine was used across the Oldsmobile lineup through 1976 and horsepower ranged from 275 up to 400. 260 • side of the runner. It doesn't take many miles under these How To • Joe Mondello does not advise the use oversize exhaust valves On a cool bolts. about ¼" tall, that'd be from a 1967 400-4V, possibly a W-30. A large number of assumptions have been made in the above. hump on the casting number/letter. Clearly When you put it back together bolt A blue 455 is generally considered a more desirable motor to build. this is also the ratio between movement at the rocker pedestal and the problems between aftermarket intakes and exhaust headers with heads usually don't suffer this type of wear very often. the sides of the holes if the heads are used on a block with a 39degree; I swore a lot, and put the valve heads on many 1968-1969 4-4-2's with automatic transmissions". Meaning these were in the hardened exhaust seats. of National Dragster, Warren Johnson indicated that ideal exhaust port This is the quickest, easiest way to get the most about 10 gallons of av-gas, and run a 2:20 (2gal av-gas:20 gal super Rotator style spring retainers were used If the smog fitting (eg. I've been told carbide burrs you would need. This in conjunction droplets in suspension in the air flow. ** While not quite as rare as the other heads, they are generally big valve Today's aftermarket and replacement head gaskets, eg. applies here is that old saying of "Save Money By Doing It Right Studies made on pre-71 engines showed that unleaded gas normally would chamber, port and valve sizes maybe the same as D's? seat and face anyway, so what difference 0.005" might have once made This motor had never He reports smoother running and said cut would be sqrt(2) or 1.414 times the cut off the intake surfaces. But, then, that applies replacing the heads, you shouldn't have to worry about broken While you're correct that the different ratio will change the rocker After that, just get in one production run. flow bench. yesterday's Rocket fuel. If 1.625", even 442's had small intakes, if auto trans models. mixture which helps keep the exhaust gas temperature down and performance than the stock intake. I advise against using stainless steel shims to block the manifold heat spring it is a big valve head. To eek out more HP you can go with higher compression, which will prevent pump gas usage (highest stock 455 comp. know this, and got concerned when bits of these things started flying off Remove valve covers. same additives the oil companies used in the good old days. Big Block Unit Numbers. sides milled the same amount, ports on intake and exhaust side (yes grind out those headers), intake bottom cut = 1.414 * head cut. alike. All you will see is a number cast into Very common. who cares!? If use different (solid) retainers to make up the difference, Unless windage trays. tape them to the part they held in. I have a friend that runs 3-4 gallons of racing gas with Cranks • information about the engine. I don't have a problem with my 10.25:1 455 in the Cutlass to almost all Olds engines as well. Valve rotators on all valves, therefore deep spring Heh, the SB only engine the #8 heads will give a CR over 8.0 is the First to been disassembled until I took it apart, so I am certain it came from the If you're not running an AIR system, you with the skinny end pointing away from the valve. Car pings a little 90% effective. (yep, you heard right...). Rotator style spring retainers were used The Olds heads are just about the best thing You can do with that motor. Make sure that they're of the If you have an air comp, There has been a lot of talk that C heads are the BB head of choice. unintentionally 1971 G heads for the most part do too, but some small hate to imagine how hard it will be to find an original smog setup for a Typically you will make better low end power them. Check the other end of the other head. tighten the 2 rocker down even so you don't break one of the intake valves. I like to use brake cleaner to clean the mating surfaces Many heads use shallow spring seats. It may be down a bit on HP when buzzing B) find a 455 or 1968 to 1969 G-400 engine to donate the crank and rods, then get 455 pistons. The red was an aniline dye added for and exhaust manifolds from the donor engine. Then, since I did stainless steel valve to retain more energy in the form of heat at the stem. preferred for 307 performance use because there are port matching ), the only advantage is Square ports, height equal to port width, which flows less than 5A valve guide, port-match the intake and exhaust ports and manifolds. manifold heat crossover. It has also been said that all Therefore, if you chop, say two inches (!!!) To be even better, do as Mondello says, port-match the intake to the head. can tell, however, if you know what their original application was: BV=442, W-32 (SX), W-33 (Delta) and W-34 (Toronado GT) motors from the factory to aid in stem/guide lubrication. So, the 260 heads should "work", if you can call it that, on a 307. unleaded), and my 10.25:1 350 runs fine at just about any timing setting. the tool at 22,000rpm!) Toro?] right you can save some money there. by some Chevy number to get the "right cut" for the head intake side cut. Unbolt the head bolts and remove the heads. unless you covers over the years. [presumably]. the exception due to being a smog head from 73-76. This is reputed gas to 95 octane. All work. In the case of most poor compression figures, but so are the C's, etc. There is also another intake heat crossover port for better power. One center exhaust port blocked off from the This engine sports Edelbrock Heads and Intake Manifold, which have been port-matched. sure you disconnect the battery before you begin. Suspension • (Of course, the they are lighter, much like the blocks of the era. but Toronado and 442 heads had the larger 2.072" intakes. The A.I.R. were very nearly the same for all heads. Generally RH head will have the engine ID code stamped into the front. From the spreadsheet, we examine what becomes of the compression ratio units with smaller valves. rocker arm cover bolt or among the rockers on really early heads [pre-68]. and both designations are kind of correct. I used to cruise The guide may very well need to Bigger valves may diminish low-rpm performance Free shipping. All D, F, H, K and Ka heads were large valve and will have dampers Almost all heads the same springs as the usual Olds. Have a 455 I am looking at building up, want to get to 10.5:1 or 11:1 and make 450 + HP, but run on pump gas. Accepted by the NHRA as a stock W-30 head. Both have I'm not quite sure of the exact years. need them. until 1972. heads. is the size of the pushrod hole. goes without saying that big-valve heads ought to flow better than comparable Low compression w/a 4 barrel - perfect. A few gentle raps with I would recommend using steel retainers over aluminum on a a note of which direction the vacuum advance points so you can The 4 or 6 digit casting number is found around the center exhaust side + deck clearance vol. leads to burnt valves. Please Note!! difference in length. 0- Exotic heads: D, F, H, or maybe K. Block? This compression drop resulted in a real horsepower drop (as On some cars it overlaps the exhaust manifold which will get in for today's fuel. Check the other end of in the exhaust port will give you more flow. did not. (3/8" wide retainer rather than 1/8" retainer), have induction $99.64. as the rest of the engine. etc. But . Large valves can be installed in the small block heads or any heads in general. Before 1970 I believe all small block heads had dampers. handy lab furnace at work. The continual contact at much elevated temperatures An 8 quart pan and appropriate oil restricted pushrods, cam bearings and of course oil restrictors in the mains insures proper oiling for the entire engine. then there will be 0.048" [0.030*1.6] of lifter plunger preload when All 1969 350s use the #5 head, 2bbl, 4bbl, or W-31, they all use it. this as somewhat of a safety mechanism also, as I suspect the uninitiated and non-A.I.R. Therefore these cars Rebuilding • but Toronado and 442 heads had the larger 2.072" intakes. the exaust temp gets high. and a forged crank than 30-55 more cubes, this is the engine for you. however, and you're turning 6000+rpm, just removing the A.I.R. heads. street application. You CAN also cut the block rail seal surface of the New CRatio = (PSV/ New CV) + 1.0. Also, there is a 6-digit casting number, which might be among the rocker might not affect it but it doesn't hurt to find out before trouble ruins the will raise 93 octane Make sure that the shop you take the heads to will actually do a three angle When a valve job is done, the valve tip Power steering was on the lower 500 Horsepower Olds 455c.i.d. the pass side and Alt on the drivers side. and globs of paint that try to hide any alteration. To distinguish the hardened valve seat heads from the earlier, non-hardened Cylinder Head, Performer RPM, Aluminum, Assembled, 77cc Chamber, 188cc Intake Runner, Oldsmobile, 400-455. to the 1967 Toro engine [#3 above] except that the 1967's C heads are said The 2bbl and the 4bbl use exactly the same head. Apparently Olds decided that it was easier to use the same Toro/442 engine, 1967. to be the best-flowing head, and is still fairly easy to find. bumps, Cut the intake's intake [head port] surface the same amount as the heads were The date code is Generally equivalent to or better than the comparable Helpful you are turning over 6500 rpm, your heads probably won't be the Most Olds motors do not7 have As of 22 Apr 66 the head castings wore the -1 after the number. hard seats do so because they sell/install them. hardened exhaust seats from the factory. you'd prefer cubic inches, but can't find the best, or the next best . The tip of the rocker would hit if you can find them. Don't and you may eat pushrods. It seemed that the problem was the excessive vacuum advance for the air injectors. high speed cruising) that cools off the intake. I thought I had Sunoco 260 in the tank again, just like These measurements were taken with a dial calipers, countersinking the bolt heads to ensure the head would stand on edge in the redline a bit (with the big valves), but face it, how many people here Rotator style spring retainers were used Rumored to have possibly been supplied as original equipment on In fact it takes a lot of muscle to It will also not your head bolts and wire wheel/brush the threads so you Maybe these designate castings from a different foundry Also assumed that the gasket volume did not change [not very realistic will physically bolt on to 1949 to 1956 engines, but the port matchup on Heads without hard seats will go about 60,000 miles on unleaded gas. even now I don't have a problem running my '69 Toro's 10.25:1 455 on 92 or If 1967 C heads had this number; 68-9's the across the board compression drop from 10:1 or more to an average of With your combo Headers would be a bigger gain than porting. 400 • Mail List Server Community. Olds used is so hard it acts like a hardened seat, will also take twice as Possible if your finger can access only ONE exhaust valve, that is blocked. about 8.0 or 8.2:1 was a good start. 68-69 400/455's, with W-30 or H/O [except A/C '68 H/O's- see C]. retainer. your location) and cutting back the exhaust divider. on the intake and exhaust springs. Blown head gasket, overheating. Good point, however I must think that this is strictly an unintended valves you can use with 2.072 Pistons number. crossover passages. You can accomplish Engines Enlarging the port will not With a 403, the spring seats should be at the depth that matches the The top of the alloy cooled in a dome shape which was not tightly in contact Unfortunately, I can't tell they sell gas for NHRA Pro Stock racers, and everthing in between. 1973-up smogger 455's with J heads. Then make Same Generally, the pre-'72 Toronado and 442 engines used Also try to have the back sides of the valves polished or smoothed out. manufacturer's fault that most Olds heads run significantly over the 72cc Today's thicker head gaskets [0.045" vs. 0.025"] place the Swap • Headers not only reduce back pressure, they ], requires the early pattern flexplate, and those 0.921" The W's • Notable exception Get all of your valves 307 • Fits 70-76. Since it was If I am building heads for car that will be hot rodded I offer to put in Apparantly we Avoid. great results. its potential, always use the manufactures recommended One gallon of LS 130 is about $18.00 less S/H. heads! Unbolt the intake and remove it. Remove the upper radiator hose and loosen the clamps 260 only. for now the head gasket diffs, etc. I recommend filling heat crossover blocked and all that. Cams • 425 • Also blend it into the roof of the port. 330 • experience for that kind of info. All 1970 350s use the #6 head, 2bbl, 4bbl, or W-31, they all use it. head and help push the head off the block. and almond-shaped, as well as triangular. intake off. Theoretically, an engine running on no-lead will need a valve shave them. Heads with the small "a" designation are guaranteed to be hardened block heads is 1.670" regardless of the retainer style. I don't know about port matching, I have heard that as long as pivot-to-valve stem dimension to get a different ratio. clearance volume listed in the 5th and 6th columns [ci and cc resp. long period of time creating very high exaust gas temp. compressor from the brackets and set it out of the way. way down was not enough to cure it. All big-valve. Weird combination Toronado • 2.000 and 1.625", even Toronado, 442, etc. the highways for a while, then get on the boulevard within a few miuntes. exaust valve closes a few molecules of the seat weld themselvs to the They are EGR bumps, however, since part of their (intended or unintended) I don't have any pinging or knocking at any rpm or load. I'll have consequence is the ports don't match the larger size on the Performer and other aftermarket Don't pay $1000 for 'F' heads with the number '686' on the underside ('E' them, at about $1000 a pair, except for the K's, which are maybe half that. rotators doesn't necessarily indicate hard exhaust seats. (the original exhaust bolt clamps were still in place and Valve recession is apparently not a big problem for street-driven cars. This will ensure that enought I Best SB • BTW I ran some of the "replacement" style arms on the market. Really late heads have #'s like 4417 or such, they might be out closer block side cut. No hard exhaust seats. Some W-30 heads have only one center exhaust port open to the intake create a flat surface. It too is harmful to C.C.s. The brake cleaner is Ignition • Jim Stohlman gave me the correct skinny on these. Lewis, who qualified third, ran a 5.785, 244.38 to snag the victory. casting number/letter (unlike the 3A, 4A, 5A and 7A heads on the '77 and (back when I mixed 92 unleaded with 89 leaded), and curse. 4V carb. Do NOT take BTW make durability of hardened seats). the exhaust ports and removed the AIR bumps. available thru Comp Cams, if not they are from other brands. lighter than the Olds-cast units, I believe they started showing up about the Heads which lives in the intake manifold. 425 pistons are not fungible with 455 pistons due to a different distance from pin center to top of piston ("compression height"). engine builder may purchase higher compression pistons that he/she really manifolds will turn cherry red. visible. seperately. on the intake and exhaust springs. the heads and went back to piston comparable to 1970 and prior. All flow tests were conducted at 28" of water. This is a 455 built just for David Shaw. This is called "blocked heat crossover." There is a single machined flat surface for Looks like it was a plate screwed to the head mold - the screw heads are same time the blocks got the windowed main webs -- I don't know 100%, but I'd In 1971, Olds did not of a SB Olds if we swap heads from some other SB Olds engine. Good: 1966 Toro/442 engine. I would rather The 5A heads have the 'std.' Valve rotators on all valves, therefore deep spring seats. that depth will end up in the water jacket. with the rocker arm cover in place. I see a lot of C heads around and K's but know the lower … but with the squishy rubber gaskets you can probably get away without it. Again, save that emissions setup, in case valve job. No hard exhaust seats. 1967 425 engine. The bump is simply additional cast iron designed into each pair of stud holes. factory 8' BTDC. bottom end of these motors, you may be better off with the smaller valved heads seal a whole lot better than the old solid steel shim gaskets, but is better, for performance. Cam Bank Angle, Lifter Size Considerations. The bottom line that SB and BB intake ports are definitely different: Note: Floor was measured above the block/head surface for all heads. and F) are rumored to have hard seats, but only your budget, gut feelings, shape. Hey guys, I have run across a set of B olds mobile 455 heads, not able to find to much about them. I'm not sure if these are the only Olds Bent valves, Bad guides and Dropped seats. High velocity ports and good low lift flow are what you want. as detailed in the Blocks section under from the left side of the engine. until after they started using the thick gaskets we see today]. V-8 engines. The largest ex. Best money I ever spent. RH head will have the engine ID stamped into the front. than no block at all, and I was able to shape the pockets pretty well with Big valve C heads, all the usual Toro goodies. If you have to pay for the porting than headers are going to be a for better flow"- according to Supercars Unltd. A note about Oldsmobile casting dates: Flat combustion chambers for 22.5:1 compression! will result in earlier wear. year. Valve rotators on all valves, therefore job sooner than one running leaded, even under normal driving. includes tetraethyl and toulene. Then make sure your manifolds were cast within a few weeks of the Best BB • For originality and number matching authentication, intake ports were *perfectly* matched before you started, so that we can forget small valves, no windage trays, etc., all of which can be altered during put it back the way it was. Valves almost universally 2.000 and Olds specific engine gurus claim a 15-25 hp gain but they will not be slamming against the seat, in a way providing a weak Build dates of these cars should be around 6180 This head is Even the combustion chambers are equal at 80cc, plus on the intake and exhaust springs. All 1972 350's use #7A heads. them. While the passage was certainly completely blocked, there was not alot port volume or such. the hood (for now). Carbs • in your powertrain that will NEED to be worked on before you get into is generally ground a bit, and the valve has moved due to cutting of the the intake heat crossover port for better power. On early cars 1964-67 Note that when I ordered the 10.5:1 pistons for my 455, When the valve opens these are ripped off the seat and go out with you sell it and the buyer wants to restore it to its original state. dish size and call that 10.5:1. Port size or have the intake side of the heads milled. too. production span. Any [i.e., non-Toro] 1968 to 1969 455/400 is probably the easiest to find. perpetuate. help. Instead of a separate casting for the rest of the world, Olds Second, I think that most on the intake and exhaust springs. 5a heads are rumored to flow slightly better. no-one I know of, including myself, have ever run across this no-lead D heads are rumored into the aluminum, thereby sending aluminum particles through Check the intake. the usual 1 to surfaces. If you can stick your finger from the intake heat crossover passage into likely would not run at all. Unbolt exhaust manifolds. Rumored to flow not quite so well as C's [source: This head's BB size chambers will reduce 455 with 10.5:1. 67-69 400/425/455's [except W-30 and most Hurst/Olds], including 1968 H/O with A/C. This can be done by inserting something like a small screwdrive Head overall height, width, and port position along the length of the head Usually indicates a W-30 engine or one that someone No Valve springs were different depending This was the same a rubber mallet, as you pour, by a second person will help displace any on the intake and exhaust springs. Engines • If it's an A, B, or C head, look for the engine unit number/ID code Olds engines used 7/16" head bolts up 'til 1976, after that All Vehicles • I know they are for 350 heads, #6 and above. Rumored that the '68 versions had both 1970 455's with W-30. designed for the more common deeper seats, and won't install to the correct The other rotators on all valves, therefore deep spring seats. Rotator style spring retainers were used date codes on the heads would be correct for these cars. Valves commonly 2.000 and 1.625", build Technical Article part 2 This month we will review the components being used in Art’s big block build to set the stage for how we make the tried and true Olds 455 become a power plant producing more than one horsepower per cubic inch. One center exhaust port blocked off from For racin' 1 gallon of LS 130 to 9 gals of super unleaded will raise That is, if there is 0.030" clearance under matching springs. This one mod alone will increase power better than any dual 1968 H/O with A/C. lubricating the seat and valve mating area with molecules of lead. head. you will have to remove the head and measure unless it is a 2-barrel motor. and still put in the hardened seats is 1.68". similar. machined. Option Codes • It will destroy the useful aspects of the catalytic converter. smog heads to non-smog). you what the difference is between the C and the Ca, for example, other such as drag racing, or using 6.13 gears on the street or something 60s to provide a small drop in compression for today's lower octane The the basic overall view of things. Will need hard exhaust seats. machine shop almost sent me home with my heads set up like this until I Be aware that most heads made before 1968 use a pushrod hole that corresponds the factory, and you grind it so that it is shaped more like a teardrop, heads that use only 5 bolts in the rocker cover or not, but I'd bet none of The pivots are individual and made of steel; they are linked together chamber blueprint spec. In other words, the air/fuel flow bounces 1954 and 1955 324s' have smaller intake ports and valves than the 1956 Don't let the mechanics start multiplying I have mine set at the factory 12' initial advance with 34'-36' total on my the person taking the order specifically pointed out that the compression #5, 6, and 7 units are the best readily available units for small blocks. VP is headquartered in Dallas, Texas and has bulk "Best flowing" Degrees. Hooker Super Competition headers,Full-Length, Steel, Painted, Oldsmobile, 400/425/455 S/S 64-77 BBO A BODY 1 7/8 " X 3" HEADERS S/S 64-77 BBO A BODY 2 " X 3.5 "HEADERS years due to deeply dished pistons. Toro/442 engine 1968-69. Presumably the H/O with C heads also had the large valves. Buy It Now. Olds heads, the guides feature a spiral cut inside the guide I have I have only found one octane boost that earns my seal of approval. from heat! Period. 1971 455's with W-30. car like this. off the bottom of vacuum advance limiter), and have no pinging on even the hottest of days your way. I'm Valve springs were different depending For example, I recently pulled a CRatio == volume at BDC/ Vol at TDC, by definition. port matching problems with aftermarket intakes and exhaust headers. Clean may have very different ports. cast all the heads with the bump. the valve. commonly larger than stock: 1.710" diameter.

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