Thread: Why did nhra change the cam and valve spring rule in 1985?
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Old 07-02-2010, 06:24 PM   #2
Billy Nees
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Default Re: Why did nhra change the cam and valve spring rule in 1985?
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Originally Posted by X-TECH MAN View Post
I dont know how hard the blown Mustangs turn their combos and what kind of spring pressures they use but maybe they would only blow by you at 145 MPH instead of over 150+ MPH.......LOL.
OHC engines use very little valve spring pressure. They don't need it.
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