Better heads

moper said
I would still preface those numbers with "Your results may vary" Bobby..lol. Your heads, on your car, with you machining, and you tuning, and a car that is a drag race and sorted combo. I also dont feel really great about 207cfm. Good numbers for the valve size and volume surely, but not enough for what I see being considered for the OP's 318, or 1967's 350" engine. I'd rather run a milder cam with a bigger port than a small port. I just get a better result that way on average. My own feeling is the 302s are a bonus in terms of cash outlay and least invasive. But they will limit both combos in the real world of compromises in conditions.

True, I was going to suggest a small valve 340/360 head 1.88/1.60 that comes from the factory at 150-152 cc's. Sure the chamber is larger but with that cam and the lack of overlap on it, this will increase the cylinder pressures a good bit. Also too doing a cleanup cut and the thin head gaskets will help in running the pump gas. I would do a good VJ and a bowl cut on both sides and some light duty hand blending and he should have 230 cfm's or so on the intake side and about 180 or so on the exhaust side. This should be more than enough for what he wants to do.