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Author Topic:   Vaccum
Dirt Full Roller

Total posts: 41
posted March 12, 2003 05:13 PM
Will 305 heads help pull more vaccum.
they came off a stock motor no work done to them. i have to pull 12"

Dirt Maniac

Total posts: 167
posted March 12, 2003 08:20 PM
12" of vacuum really ain't a whole lot. I run a pair of 461's 2.02 int, 1.96 ex, flat milled, & pocket ported. and pull 17" at 1000 RPM's. But other variables come into play when pulling vaccuum not just your heads. I'm no engine expert, but I think you'd be plenty safe w/ the 305's, and if it were me I would invest in a better set (if rules or $$$ allow).

Dirt Roller

Total posts: 8
posted March 12, 2003 09:16 PM
No , they will not help pull more vacuum.You need a cam with wider lobe separation.

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