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12-13-2017, 04:21 PM
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#1 |
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VIP Member
Join Date: Jul 2002
Location: Michigan
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Re: Aftermarket/Replacement Cylinder Head Rule Change
Just say "no".....to aftermarket heads.
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Jim Kaekel 3836 STK |
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12-13-2017, 04:28 PM
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#2 |
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Senior Member
Join Date: Dec 2001
Location: Elysburg, Pa
Posts: 733
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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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12-13-2017, 04:52 PM
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#3 |
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Junior Member
Join Date: Apr 2016
Posts: 27
Likes: 5
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Re: Aftermarket/Replacement Cylinder Head Rule Change
Guys you are missing the point here.
Aftermarket heads are already accepted with a HP penalty. There is talk that they will become "replacement" heads and this result will eliminate the different factors of OEM vs. Aftermarket heads for the combos that currently have them. Trying to find out "if" this does go through, what will happen to the two hp factors that are currently different? |
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12-13-2017, 05:13 PM
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#4 |
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VIP Member
Join Date: Dec 2001
Location: Arkansas - In the middle of everything.
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Re: Aftermarket/Replacement Cylinder Head Rule Change
Conceptually, when you place a different hp factor on an engine because of the use of replacement heads (aftermarket or OEM), you have essentially created a new engine for the books. The problem is the way that classification is calculated since it uses a weight break of one rating and then the weight of the new hp factor. Eliminating the differential of ratings will simplify the calculation for the guys in the field, which is always a good thing since it helps eliminate confusion and mistakes.
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12-13-2017, 08:30 PM
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#5 |
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Junior Member
Join Date: Feb 2008
Location: Sun Valley,Ca
Posts: 86
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Re: Aftermarket/Replacement Cylinder Head Rule Change
So does this mean that if a combination has been factored 20 HP now its gonna go back to the OG HP rating??
Example 396 Iron head is 375/385 396 Alum head is rated at 405HP Both heads go back to 375? |
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12-13-2017, 09:49 PM
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#6 |
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VIP Member
Join Date: Dec 2004
Location: Cumming GA
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Re: Aftermarket/Replacement Cylinder Head Rule Change
It makes sense to me that there would not be a penalty in superstock. heads can be modified extensively. Stockers should keep the penalty for the aftermarket heads. My opinion anyway.
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James Schaechter 3163 STK |
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12-22-2017, 12:52 AM
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#7 |
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Senior Member
Join Date: Jul 2007
Posts: 964
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Re: Aftermarket/Replacement Cylinder Head Rule Change
5hp off only for aftermarket head.....
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Stephen Johnson #2162 Horace Johnson #2167 SS/D 427 Ford Fairlane NHRA-IHRA |
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12-22-2017, 10:27 AM
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#8 |
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Member
Join Date: Nov 2016
Location: Indianola Washington
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Re: Aftermarket/Replacement Cylinder Head Rule Change
Does Edelbrock then make a SBC head with intake runners 161-165 CC's? Edelbrock is the only approved head? All I have seen is 180 CC and up.
Steve Teeter STK 6380. |
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12-22-2017, 10:30 AM
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#9 |
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Member
Join Date: Jul 2007
Location: Georgia
Posts: 158
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Re: Aftermarket/Replacement Cylinder Head Rule Change
One of the listed heads is close in CC to the stock specs. This rule is good for guys in the cylinder head business. Now we need a head approved for the Pontiac.
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Michael Brand II 505B - F/SA |
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12-22-2017, 10:47 AM
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#10 |
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VIP Member
Join Date: Oct 2008
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Re: Aftermarket/Replacement Cylinder Head Rule Change
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