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#41
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The auto trans W-30 455 and the little brother W-31 350 used the smaller 308* camshaft - and Crane sold a "Fireball" cam that was a very close replacement. The W-30 stick cars got the 328* version, and no power brakes.
In the W-31 350, with its 4.057 x 3.385 bore and stroke, the shift points were as high as you dared to run it. and it got a very specific harmonic balancer that's Big Money today. They're rev happy little monsters without a lot of effort. One of the members of an Olds forum I used to be on - was a GM assembly plant manager during the musclecar years.... told us that the advertised HP of many of the musclecars was the curb weight divided by 10. So it weighs 3700#? 370hp! And the engine did that number but it wasn't anywhere near the peak output in many cases. Yes, theyre all 100hp engines... somewhere on the curve.
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Clutch Guys Matter _______________________________________ 53 Studebaker, 400P/th400/9" 64 F-85 72 4-4-2 Mondello's VO Twister II 84 Hurst/Olds #2449 87 Cutlass Salon 54 Olds 88 sedan |
#42
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Duration @ .050" is 233 in/ex. https://www.compcams.com/factory-mus...e-260-455.html Ponchy
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#43
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First you must decide which is the real W-30 cam. And the source for that number. Comp uses the 402194 specs.
Mondello the noted Olds experts state their W-30 Factory Reproduction Cam as part number MW-30 Hydraulic Camshaft here: https://mondelloperformance.com/prod...lic-camshafts/ As noted in post number 7 One source: Two cams for the hi-perf 455's. One, #402194, is for the 390 HP, the other is #402569. This is for the W-30 unit The 402194 specs are: (.050") 232*/232*x (Adv.) 308*/308* x .474"/.474" x 113* LS. The 402569 specs are: (.050") 244*/244* x (Adv.) 328*/328* x .475"/.475" x 110* LS. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE Last edited by Steve C.; 05-27-2020 at 03:22 PM. |
#44
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Thanks for clearing that up Steve C.
I was unaware of the bigger cam. I looked up the link you left and it appears the smaller cam was used in the 350 W31 engine, while the larger one was used in the 455 W30 engine. ...interesting. Everything I've ever read, heard, seen on the subject always said both engines used the same cam. Sounds like that may not have necessarily been the case. A quick question - Do you know if the first cam seen in that link (JM-18-20) is the '64 Spec 442 cam from the 330 engine? Ponchy
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Last edited by Ponchy; 05-27-2020 at 05:38 PM. |
#45
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The Pontiac split lift profile works goos in Olds engines. A top renown builder and Carb specialist s decades experience saying the Pontiac cam profile is superior.
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#46
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Olds 1964 Spec 442
330 Cid 310 HP Olds Camshaft Specifications 1964-1977 1964 387484 52 278/282 .430/.432 330 Police Pursuit 577994 36 250/264 .380/.390 330 2BC, D88 2BC https://oldsjunction.classicoldsmobi...ofcam.htm#Cams .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
The Following User Says Thank You to Steve C. For This Useful Post: | ||
#47
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The only 455 engines I am aware of to receive the same cam as the w31 350 (308/308) cam were the 68-69 Hurst Olds cars which were 390 hp. One of the McClarens here is built up like a Hurst Olds 455. But has C heads instead of D’s. It has a noticeable ruff idle. The w33 390 hp police 455 had the smaller #400165 285/287 cam like the w30 autos in 70. Lots and lots of Olds 455s get refitted with the 308/308 and call it the W30 cam. It seems like it is a popular cam for a 455 Olds like the 041 type grinds in a Pontiac 455.
I used some single pattern cams similar to the Olds cams in Pontiacs for some dirt track racing. My opinion is the most of Olds 455 engines need the extra duration on the exhaust. More so than many Pontiacs. The cheater version of the w30 had about 20 more degrees on the exhaust than the intake. That is a big split. E/I ratio on the Olds heads is lower than most Pontiac heads. Here is a Hurst Olds car test. You can year the ruff idle right away. It ran good, best et was a low 13 @ 107 mph. Cool old video. https://m.youtube.com/watch?v=kuGjbKUYADs Last edited by Jay S; 05-27-2020 at 06:35 PM. Reason: Edit |
#48
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Leave nothing for the doubt
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#49
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The Following User Says Thank You to PontiacJim1959 For This Useful Post: | ||
#50
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#51
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Nothing missed , My bad to not be more clear. Intention to just inform on comparison performance in cam testing. Olds VS Pontiac cams. The thread had cam specs and comments concerning them, one VS the other. |
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