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Marty Buth 09-04-2007 10:17 AM
Valve Diameter Tolerance
 
What is the tolerance on valve diameter from the NHRA apecification?

Bill Harris 09-04-2007 10:56 AM
Re: Valve Diameter Tolerance
 
2007 Rule Book Pg 55. "Valve diameter tolerance +0.005" or -0.015" from NHRA specs."

Dwight Southerland 09-04-2007 10:58 AM
Re: Valve Diameter Tolerance
 
From the rule book under section Engine:1, Cylinder Heads, "Valve-diameter tolerance: +.005" or -.015" from NHRA Specs." You do have a rule book, don't you?

Marty Buth 09-04-2007 12:28 PM
Re: Valve Diameter Tolerance
 
Thanks for the response. That was my memory, but didn't have the rule book handy.

Mike Pearson 09-04-2007 01:42 PM
Re: Valve Diameter Tolerance
 
Marty,

Make sure that you check the NHRA specs. They dont always match the OEM valve size. I got tossed for an intake valve that was - 0.016. By Westley of course.

Mike

Marty Buth 09-04-2007 02:22 PM
Re: Valve Diameter Tolerance
 
Mike,

Thanks for the heads up. My brother and I both run 2300 ford motors and they are different, even though you can buy a lot of valves that are after market for both years of our cars.

Thanks,
Marty


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