Why so much inital timing???

MOPAROFFICIAL said
Now you are splitting hairs...
7.1 is when you finally call it a dog, hmm telling. You picked a line or two, took them funny and then ran with it.
Talk about triggered...

Cause below 7:1 is a dog. 7:1 would run on pump regular. Why build a performance engine to run it on regular?

I didn't pick a line or two. In one post you straight up said his cam was too big for good DCR. That he needed 8:1 or more. When he was already at or very close to 8:1. So which is it? lol Don't get bent out of shape cause you got caught skipping the homework. And triggered? No. Triggered is taking the 10 minutes to go through and dislike every post in a thread cause you're having a hissyfit lol.

mopowers said
I used this one- RSR Static Compression Ratio Calculator and used positive 7.5 cc's for the piston valve reliefs and -.015" for deck height since the pistons are out of the hole. It seems backwards, but that's the way the calculators work. The calculator I used doesn't take the larger bore diameter of the head gasket into consideration though. The wallace one does and produces 9.64 with my numbers. Either way, the SCR I get is 9.6-9.7:1, depending on the calculator. Obviously, the 0.1 difference is lost in the noise.

Ahhh ok. When you said -7.5 cc volume. I took it the other way. Usually negative volume means you ADD compression. By making the compression chamber smaller. Make sense?

So lets just say 9.6 for sake of argument. With 61.5 IVC, put's your dynamic compression ratio at 7.80:1 .Your dynamic cranking pressure is 154.70 PSI. According to the wallace calculator.

So yeah. There's more in there for DCR. You could go to a .040 cometic head gasket. Pick your static compression up to 9.92 and DCR to 8.05. IF that really matters to you.

mopowers said
You think??? Even though the venturi and throttle bore sizes are the same as the proform? It'll be interesting to test when I go to the track. I've got a wideband to help get them both tuned well enough before the track shootout.

Well I whenever I say double pumper I just mean the style itself. Holley, AED, proform, quick fuel. Whatever. 750 doubles seem to work great on 340s.