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So I'm using the wrong intake valve closing position? If that is correct, and I plug your numbers in, I get a cranking pressure of 165, which is exactly what I measure. That means I didn't do anything wrong with the build, just the calculation to get cranking pressure. Thank you so much...

What type of heads are you using? How many cc's are your heads? I'm using 63cc closed chamber heads. The pistons are flat top, with 5cc recess for the valves.

Here is my cam card. I used the 39 ABDC. I calculated a static of 10:1 and expect 193 psi of cranking pressure.

I used a calculator on wallaceracing.com to get these numbers. The result are below. I started checking my work because I found I need to keep my throttle blades open so much to idle at 800rpm that my idle mixture screw no longer change the way it runs. They do change the idle mixture, but...

5cc dish for valves. No vacuum leaks. Just trying for a slightly hot street car. I actually removed carb to make sure no restrictions. I can't believe a cold engine would drop 30psi.

I could use some help with my 340. I rebuilt the motor two years ago. Its the first rebuild I've ever performed. I rebuilt it shooting for 10:1 static compression, used a Lunati Voodoo cam part # 10200703. The motor runs fine, vacuum is at 10" with a bit of a rough idle, which I assumed was...