Anybody running the '68 4 speed 340 cam?

1MeanA said

As I mentioned I am not running power brakes. Idle vacuum of 10-12 and 15 during cruise seems low on a new engine. I was curious as to what others were getting and whether I should look deeper than I have done already for a vacuum leak.

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I believe your hg reading is close. I ran a .462" lift 226/226 @ .050 hydraulic with 111 lsa in my 2.02 valve 340 with 2 v relief Sealed Power oem replacement forged pistons. Equipped with Carter Comp 750, the best I could get at Idle, running a mechanical Mallory Unilite Distributor was 13hg. The set up ran far stronger with a spreadbore.