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Old 12-13-2017, 10:04 AM   #1
SS734
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Default Aftermarket/Replacement Cylinder Head Rule Change

Any News as to how the HP factors will be effected with the new rules combining them with OEM heads?
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Old 12-13-2017, 11:39 AM   #2
TommyPettigrew3076
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Where are you seeing the aftermarket head rule I am missing something ? I know several combos allow them but I didn't see any new rule about them
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Old 12-13-2017, 11:59 AM   #3
SS734
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Its coming out with the HP releases next week. NHRA is deleting all the different HP factors and combining them all in to one factor for each combo that has approved aftermarket heads.
I was wondering if anyone knew how they were going to determine the new "single HP factor" where the OME head was rated higher than the aftermarket head HP factor and vice-a versa?
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Old 12-13-2017, 12:41 PM   #4
superdart
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Cylinder Head rule has NOT! been approved yet, they are having another meeting next week
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Old 12-13-2017, 12:51 PM   #5
MR DERBY CITY
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Nice, and you guys think that there are NO crate motors in NHRA....
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Old 12-13-2017, 01:29 PM   #6
SS734
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Maybe Mike Crutchfield can give us an update.
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Old 12-13-2017, 02:03 PM   #7
Mike Pearson
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Quote:
Originally Posted by MR DERBY CITY View Post
Nice, and you guys think that there are NO crate motors in NHRA....
Its getting real hard to find some of the older factory heads that are 40 years since they have been produced. I welcome the ability to start with a brand new casting. Just keep the original valve size, port volume and chamber volume as original on the NHRA head CC volume list
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Old 12-13-2017, 02:13 PM   #8
Chris1529
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

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Originally Posted by MR DERBY CITY View Post
Nice, and you guys think that there are NO crate motors in NHRA....
Give everyone a stock replacement aluminum intake too and there you go.
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Old 12-13-2017, 02:21 PM   #9
Jim Kaekel
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

Just say "no".....to aftermarket heads.
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Old 12-13-2017, 02:28 PM   #10
Paul Precht
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Default Re: Aftermarket/Replacement Cylinder Head Rule Change

I could be wrong but I don't think it is practical to use the Edelbrock head on the Max Wedge, the port mismatch would be quite a challenge since you cant enlarge the ports. If they raise the iron head HP to the aluminum head HP the factor would be higher than the original.
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