wrong spec submitted by MOPAR

[David Barton]

Originally Posted by Andys dad

I know Arrow built these as good as any engine builder out there - they just did not know MOPAR made a mistake - they used the valve which was identifed to go in the heads - stock size for a Gen IV viper engine - The TI sheet was submitted to NHRA after the engine building started - the valves used were appearently incorrectly measured by MOPAR engineering - used a blue print to figure out how to do it - LMFAO

Ron

It sounds like Arrow is not up to speed on how racing NHRA Stock Eliminator works. I don't doubt they know how to build engines, but they really should have reviewed the spec sheets provided on NHRA's web site. Actually, they should have been one of the first people to point out the mistake if there was one.

I can guarantee you that if I built the engine I would have checked the spec sheet instead of blaming Mopar. Sure, maybe they submitted the wrong info, but the fact is that the rules were in writing and that is what we go by in NHRA.

[Andys dad]

Originally Posted by David Barton

It sounds like Arrow is not up to speed on how racing NHRA Stock Eliminator works. I don't doubt they know how to build engines, but they really should have reviewed the spec sheets provided on NHRA's web site. Actually, they should have been one of the first people to point out the mistake if there was one.

I can guarantee you that if I built the engine I would have checked the spec sheet instead of blaming Mopar. Sure, maybe they submitted the wrong info, but the fact is that the rules were in writing and that is what we go by in NHRA.

OK - I will make one last comment - there was no spec sheet.........get it.......the specs were not published until after the engines were built..... I am not sure how that process worked....if I could delete this thread I would - I was only defending Dave - sorry - my humble apologies to all of you top flight engine builders who know so much more than anyone else


Ron

[Tom P]

Don't the OEM's usually measure differently than the total OD of the valve? I have seen the 428 CJ being called 2.06" in old Ford internal documents instead of 2.09".