I have a stock 350 from a 71, #94 heads hearing some conflicting info on these being 8.2:1 or 8.8:1. Leaning towards 8.2:1 or even 8:1 quite frankly. I think they're 96cc but the info on the net seems to be of varying accuracy (for instance I found a site for instance that said these have screw in studs.)
I currently have a fully stock 3/8 press in stud valvetrain. I know this will make a difference, trying to keep downtime minimal as well as expense but am not going to argue with working smarter instead of harder.
That all out of the way, I'm looking to keep head gaskets in tact. REALLY not wanting to do a set of heads for this engine right now. Really not looking for all out power, just a bit more oomph and more drive time. If I do that I'm looking for a set heads that have chambers in the 10-20cc smaller vicinity.
Other relevant stuff is a 3 spd, 3.23 rear axle. Stone stock exhaust that will get tossed for duals in the 2-2.25" range with an intermediate (X/H) pipe. Headers are an option as well, but I've heard the manifolds are pretty decent. If i get headers I'm doing long tubes though.
My candidates as it stands are 2 Howards cams. 410931-11 is a [email protected]
/.450 lift cam with a 107CL/111LSA on the stock base circle. This means I should theoretically be able to use the stock valvetrain with it. The second cam is similar except it is 213/223 duration instead and a 108CL/112 LSA. Howards recommended the single pattern cam, they said for increased torque. I am looking for a max RPM of the low-mid 5000s. With a SBC this would be a safe combo on press in rockers, how does it make out on a Pontiac?
The springs I was wanting to use have an install height of 1.75, and would be at 270 with the valve open and 135 with it closed. Does this sound about right for this cam? Howards also offers another smaller diameter, shorter spring. Would I need this one for my heads without cutting the spring pockets? I know that the early heads are a good bit different than the later ones, including having valves closer together.
ED:forgot to mention, Qjet and probably an iron intake as well for it unless I can find a Performer/HO/SD intake.