Aftermarket/Replacement Cylinder Head Rule Change

SS734 · 12-13-2017, 12:04 PM

Any News as to how the HP factors will be effected with the new rules combining them with OEM heads?

TommyPettigrew3076 · 12-13-2017, 01:39 PM

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

SS734 · 12-13-2017, 01:59 PM

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?

superdart · 12-13-2017, 02:41 PM

Cylinder Head rule has NOT! been approved yet, they are having another meeting next week

MR DERBY CITY · 12-13-2017, 02:51 PM

Nice, and you guys think that there are NO crate motors in NHRA....

SS734 · 12-13-2017, 03:29 PM

Maybe Mike Crutchfield can give us an update.

Mike Pearson · 12-13-2017, 04:03 PM

Quote:

Originally Posted by MR DERBY CITY

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

Chris1529 · 12-13-2017, 04:13 PM

Quote:

Originally Posted by MR DERBY CITY

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.

Jim Kaekel · 12-13-2017, 04:21 PM

Just say "no".....to aftermarket heads.

Paul Precht · 12-13-2017, 04:28 PM

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.

12-13-2017, 12:04 PM	#1
SS734 Junior Member Join Date: Apr 2016 Posts: 27 Likes: 5 Liked 4 Times in 3 Posts	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?

12-13-2017, 01:39 PM	#2
TommyPettigrew3076 Junior Member Join Date: Sep 2006 Location: Fishers Indiana Posts: 63 Likes: 9 Liked 26 Times in 11 Posts	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

12-13-2017, 01:59 PM	#3
SS734 Junior Member Join Date: Apr 2016 Posts: 27 Likes: 5 Liked 4 Times in 3 Posts	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?

12-13-2017, 02:41 PM	#4
superdart Junior Member Join Date: Oct 2008 Posts: 20 Likes: 0 Liked 65 Times in 7 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change Cylinder Head rule has NOT! been approved yet, they are having another meeting next week

12-13-2017, 02:51 PM	#5
MR DERBY CITY VIP Member Join Date: Feb 2014 Location: Derby City, USA Posts: 3,645 Likes: 1,085 Liked 7,967 Times in 1,524 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change Nice, and you guys think that there are NO crate motors in NHRA....

12-13-2017, 03:29 PM	#6
SS734 Junior Member Join Date: Apr 2016 Posts: 27 Likes: 5 Liked 4 Times in 3 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change Maybe Mike Crutchfield can give us an update.

12-13-2017, 04:21 PM	#9
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,229 Likes: 133 Liked 535 Times in 110 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change Just say "no".....to aftermarket heads. __________________ Jim Kaekel 3836 STK

12-13-2017, 04:28 PM	#10
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 733 Likes: 360 Liked 327 Times in 121 Posts	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.