My vacuum at idle in gear is about 7 inches. Not very much. If you have power brakes, I think you need more than that. I have manual brakes ...
You know................. with all the friggin measuring I did when I put the engine together, I never got around to measuring the piston to valve clearance! I shift at 7200 rpm. This spring I advanced the cam 2 degrees and still didn't check it. I haven't been to the strip yet this year, but it has seen 7200 a few times since the cam advance and it is still running strong. My guess is I'm at the ragged edge. When/if it blows up, I'll find out for sure
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Cheers.
Danford1
PS If the weather is nice this Wednesday, I may go run the snot out of it at test and tune night. See if I can improve on my best of 7.47 in the 1/8 which is a 11.66 in the quarter. The 2 degree cam advance feels good according to my seat of pants-0-meter.
