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Old 12-06-2003, 09:23 PM
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Need some advice please

I've got a 3,55 sbc sitting on my engine stand just waiting for my pickup to get put back together,witch is a 1976 GMC shortbed that is 3900 lbs, it has a 350 tran's, and 3.40 gear's. Now the engine has a stock crank and reconditioned rod's, a set of .30 Hypr Speed Pro piston's with a .125 dome, a set of S/R torquer's, an Edelbrock EPS manifold and 1405 carb, a Lunati flat tappit cam with a .458 lift, .218@50.) Im a little nurvice about the breaking in of a flat tappit camshaft, because this block had a cam with a rounded off lobe on it, there for im kind of think'in of a roller cam instead of the flat tappit cam. The roller cam im lookin at is the Comp, 12-422-8 that has a @50 of .218-.224 and a lift of .498-.502,(The truck will be a daily driver and crouser) my ? is would this a wise choise and is it worth the cost of a retro-fit roller cam.

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Old 12-06-2003, 09:27 PM
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roller cam is always a good choice
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Old 12-06-2003, 09:28 PM
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Don't be afraid of breaking in a flat tappet. The problem with your old cam shouldn't transfer to the new one. If it did a roller cam wouldn't work either.

That roller cam you mentioned wouldn't be worth the swap. It has pretty weak duration to lift specs. If you are going to run a roller cam, you should take advantage of the steeper ramps. I don't think that one does.
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Old 12-06-2003, 09:40 PM
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If i decided to do a roller wich one would you recamend
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Old 12-06-2003, 09:43 PM
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The Comp retrofit cam: 280 HR, 12-430-8 looks good.
280o advertised
224 @ .050
.525 lift
110o lobe sep.
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Old 12-06-2003, 10:01 PM
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Yea sound's good to me>< the only thing is that from what the tech guy's at Summit and Comp tell me is that anything bigger than the 12-422-8 cam would need a stall wich would kinda hurt fuel milage a little to much in a heavy truck. With the roller cam's being so expensive i want it to be right one the first time around.
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