Motor is a fresh 350 with .060 bore, 9.5-1 comp (for now) hypereutectic pistons, 10-10 stock crank, victor jr intake, 750 q jet, 306 duration 518 lift cam, headers, th350 tranny.
So I'm looking at the 202/160 heads, what would be better for me, the 64 or 72 cc head?

Thanks for any info

I'd say the 64cc considering the cam might like more CR, but you're in CA so gas may be a problem.

Are you using flattop pistons?

What cc head are you basing your 9.5 to 1 on - a 64cc head or a 72cc head? Your piston manufacturer should tell you compression based on either.

Also, I would think you would want much higher compression than 9.5/1 to run that kind of duration. I think you will go faster with a smaller cam (if that's your goal).

This sounds lame but I really don't have much info on the engine. I had it built by a local hot rod guy and pretty much was burned. It runs great but it wasn't what I asked for so now I'm trying to get some power into it.

I don't think they are flat top pistons.

A smaller duration cam would give more power? That cam would be good if I had more comp though right?

What did you build the engine for? Is it street, strip, or street/strip?

If this a primarily a street engine, I'd get a smaller cam for torque and a dual plane manifold. If it's 100% strip, I'd tighten up the quench as much as I could and raise the compression with a 64cc head. Maybe even shim the head for more compression if necessary. For street/strip I'd take the quench down to around .040 if it's not there already, raise the compression, and get a slightly less radical cam.

What is your stall speed? What is your rear end gear ratio?

Street/strip.

Stall speed is 3000 and rear gears are 3.55

I run about 3200RPM on the highway with my 4.10, so you are going to be below your stall at cruising speed with those 3.55s. I personally would think about camming that car down and putting in a converter that's slightly over stock. That would be the cheapest way to some happiness. How fast do you want to run? What type of heads do you have now with that 9.5/1?

I agree. Either you put in a smaller cam and converter to match your gears and compression... or up the compression and stick in some numerically higher gears.

The first method would be better for a street car...the latter would be better for a strip car. Take your pick.

Just rebuilt stocker heads but a buddy has a set for sale 64cc 2.02/1.60 He ran 12's with them on his small block. I'll probably pick those up.

What gear do you guys think would be better for my set up? I do a little Highway driving, 3.73?

If your going to keep that cam, I'd get some 4.10s or so. As long as you're not concerned with gas mileage, they'll match your cam and stall better.

EDIT: As long as it's a little highway driving. With 4.10s, your RPMS will be at 3K or more at 65 mph (depending on tire size).

Let's get the casting numbers off those heads so you can figure out what CC they are. That will tell you where to go. If they are 72s you will pick up some compression, but I still don't think it will be enough for that cam.

Again... How fast do you want to go?

I checked the numbers a year or so ago, I'm almost positive they were 72's.

Fast, really fast.

I'm going to bandaid this motor for now. I still have the original block that I'm going to build into a 383.

A 306 cam is going to want about 11:1 SCR minimum. flat top pistons in a .060 350 is about 10.4:1. You need a smaller cam or more compression. Given the gears and other specs, I agree with the others, a smaller cam would be a good idea.