Holley Jet size

Thanks for the response Gives me something to to start with. I'm no pro but will will start 1st checking the power valve . 15" vac. #8 valve.Then go from there with jetting. I am now definitely too lean with current carb. which 1st leads me to think I had a vac. leak. But don't think that's the case as 15 is about right with stock ( I think ) cam . If I had $$$ I should have upgraded cam (just replaced lifters). All I did was inspect measure for wear and re-used.Motor sounds sweet with 160 psi Comp. check.


If that's 15 inches at idle it doesn't matter. Don't set PV opening from idle vacuum. Do it from cruise vacuum.

You probably have 18-20 inches at cruise, so the best you can do is 10.5 and that's opening it a bit late.