Im at 24 on a 40k block. But its got a spun bearing now.
Idle at 750. Y8 block/Y7 head

Bro's Gsr is 24 also at 750-800.

 

yep 20 here

 

was at 16 vac 2 days ago and now 21 vac after valve adjustment

 

21-22 at idle, 24 on decel...use to be 20 all the time till i broke a piston...then it started pulling more vaccum? even with new pistons....Autometer gauges are gay (but damn for the price a couple inchs/PSI +/- who cares?) ...

 

I've heard that aggresive cams give a lower vac reading.
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Really ?

Why do you think all the big cam V8 guys get electric vacuum pumps to run power brakes ?

 

i've got 14 on mine, maybe my valves need an adjustment

 

is it just me or it happend to all the autometer boost gauges.
in hot weather the needle always stays BELOW 0 with the engine off
in cold weather the needle always stays ABOVE 0, the colder it is the futher it gets, this few day it sits at like 2 to 3 psi with the engine off. so my idel reads like 17 inches. (but it is still 20 after u do the math :P)

 

I'm not a "big cam V8 guy" so I don;t know. :P
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Haha.

Well if you were.. lol

Yea anyway. When I get my 272 cam for my y7 head ill let you all know the difference.