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charlie6178 06-22-2018 04:45 PM
Intake manifold vacuum
 
Roughly what kind of intake vacuum are you guys seeing with a decent size cam and heads? I am chasing an issue and wondering on vacuum. I checked my stock L98 and it's about 22in of vacuum and this 87 I'm working on has a 224/230 cam, big heads, about 10.5:1 and a big intake on it and it's around 12-13in of vacuum at idle. Is that about right for the size of cam and intake?

ULTM8Z 06-22-2018 08:09 PM
Re: Intake manifold vacuum
 
Originally Posted by charlie6178 (Post 6230831)
Roughly what kind of intake vacuum are you guys seeing with a decent size cam and heads? I am chasing an issue and wondering on vacuum. I checked my stock L98 and it's about 22in of vacuum and this 87 I'm working on has a 224/230 cam, big heads, about 10.5:1 and a big intake on it and it's around 12-13in of vacuum at idle. Is that about right for the size of cam and intake?
I assume the rpm is the same for both measurements. But yeah 13 is pretty good for that size can IMO.

charlie6178 06-22-2018 11:10 PM
Re: Intake manifold vacuum
 
That was high idle for the stock L98, didn't think about RPM variance, I would assume it drops a little once it's warm. I will warm it up tomorrow and check, but if 13ish doesn't seem alarming then I might be ok on vacuum leaks


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