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12-11-2008, 01:31 PM | #1 | |
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What cam?
I need some assistance picking a cam for my 400. I see alot of info regarding the LSA of a cam, here's specifics:
67 GTO Heads: RA4 (614's) Dougs Headers - 1/3/4 tubes HO455 Al intake (port matched) Flat top pistons TRW L2262F - std. bore at this time* CR around 10:2.1* Rear end ratio: 3.90 TH400 with 2,600 stall TCI converter Weight: about 3575 Cam used last 30 years; Ram Air 4 9794041 "T" Pontiac Carb: Quadrajet 800 CFM Rockers: 1.65 Comp Cams I am in the process of rebuilding the engine, and want to use the latest technology cam, but not too sure which one to use? I may have to overbore the block to .030 and then have the pistons dished to run today's lousy gasoline. Hoping for around 9:2.1 CR with no more than 9:5.1. The combination that I have run forever has been perfect, plenty torque and HP. The "T" cam is has a 113.5 LSA, if I used a newer model cam with the same LSA would I be in trouble with detonation and ping? It's a weekend driver, so the use of Premium is not an issue. The Comp Cams rep said to use their 51-224 cam with a 110 LSA, that's where the confusion started. I'm leaning heavily toward the Crane RA4 model, Edelbrock 7157, or even the Comp RA4 cam. I would like the lope that the T cam had and the excellent mid-range. Comments welcome!! Thanks in advance!! |
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12-14-2008, 08:33 PM | #2 | ||
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Re: What cam?
Quote:
.470/.470 lift Look it up. Run high test you'll appreciate the cam more. Gary |
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12-15-2008, 08:42 AM | #3 | |
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Re: What cam?
This is a duplicate post from another Pontiac site. Find the most accurate answers there... But yes, XE274H is an excellent grind for this application.
66, Not to be rude, but the "Edelbrock" cam you refer to is a knock-off of a 42 year old factory performance grind (Ram Air IV or "041"). While not a BAD cam in a higher compressoin environement, it is a turd in a 9.5:1 engine unless "advanced" 4 degrees. It has been obsolete for no less than 10 years now. This is true with the majority of Edelbrock's cam offerings. Edelbrock BUYS cams, they don't grind them, or even "design" them. Most are Wolverine "Blue Racer" or other Camshaft Machine "generi-grinds". Comp and Crower have leading-edge technology and are far superior. Please, tell me you're refering to a Chevy (or maybe a Harley?) when you say "66 Glide"... Jim |
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02-14-2009, 11:50 AM | #4 | |
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Re: What cam?
I've run the Comp Cams 51-224 cam in a 455. It sounded like a 041 cam at idle but it had way more mid range and top end (1600 to 5800rpm).
I think the 51-224 cam in a 400 will sound more aggressive at idle than an 041 in the same engine. I also believe the 51-224 cam will pull harder. Good luck! |
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02-28-2009, 09:36 PM | #5 | ||
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Re: What cam?
Crane Cams - out of business!
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__________________
Knowledge can be communicated, but not wisdom! |
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03-03-2009, 09:13 AM | #6 | |
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Re: What cam?
HotZ,
Any particular reason you posted the Crane Cam failure here? No good running Pontiacs use Crane cams for MANY years now... Crane is gone because they did not offer competitive products and had very poor customer service after the large corporate "take over" from Harvey. Imagine my surprise... Jim |
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01-06-2010, 03:47 PM | #7 | |||
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Re: What cam?
Quote:
Quote:
__________________
Knowledge can be communicated, but not wisdom! |
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