[Stan Weiss]

Originally Posted by Cliff R

Maybe on paper, but realize that dyno simulations do NOT tell us how well a cam will work once placed in service. Idle quality, vacuum production, throttle response, power right off idle, and good power and efficiency in the "normal" driving range is NOT well reflected by peak and average power numbers.

From what I've learned from actually doing this coming up on 50 years now is that compression is your friend with these things. Higher compression makes MORE power (torque) at every RPM, all else being equal, and it allows for larger cams with more seat timing and offsets losses in dynamic compression from going tighter with the LSA as well.

I've never built a Pontiac 350, but if I did the FIRST thing I would do was to obtain a late 60's set of small valve small chamber heads (grocery getter variety) like 1969 #46 castings. I'd do some good valve and seat work, better springs, screw in studs and mill them so my "little" 350 engine was closer to 10 to 1 compression than 7.5.

At that point I'd cam it similar to what I do with my 350 SBC builds (the exact specs depending on application/use of the vehicle). Then I'd enjoy closer to 1hp/CID or even a bit more, with good idle quality and street manners vs trying to defy the laws of physics and build a strong running 350 with no compression and too much cam in it trying to push around nearly 2 tons of vehicle without a lot of gearing or converter......FWIW......

Cliff,
I have never seen loses in dynamic (cranking) compression from tighter LSA. What I have seen is loses in idle vacuum from tighter LSA

Stan.