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-   -   Aftermarket/Replacement Cylinder Head Rule Change (https://classracer.com/classforum/showthread.php?t=68473)

jmcarter 12-22-2017 01:20 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Quote:
Originally Posted by M Brand 505B (Post 552256)
The Aftermarket head has to retain the same specs as the head it's replacing.
....

HR9121 12-22-2017 01:25 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Junior Super Stock

PJ305 12-22-2017 01:29 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Quote:
Originally Posted by Bob Mulry (Post 552248)
I think that we are missing the point on these replacement heads...

Runner volume is just one way to compare castings...

With the new replacement castings I would like to know what the flow numbers are from each head..

Just because the volumes are the same it has nothing to do with air flow or the horsepower that they are capable of making..

It looks like another can of worms just got opened for Stock...

Just sayin'
I agree with Bob, no need for all the choices. You know the flow figures will be all over the map. NHRA needs to choose one brand that is readily available (after all they are only doing this because stock castings are to hard to find for a SBC) and apply whatever HP they show!

Erik Jones 12-22-2017 01:35 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Everyone needs to realize that we all need replacement heads if we want to continue to race Stock And Superstock. The replacement head has to have the same spec as the OEM it is replacing. This is no different than the FE Ford, Big Block Dodge and Big Block Chevy. If anyone thinks the port shape is worth something major in a .400" lift Stocker you probably read to many "High performance Books".
Just relax and grow with the times....

Dan Fahey 12-22-2017 02:24 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Quote:
Originally Posted by HR9121 (Post 552259)
Junior Super Stock
Good point !
That makes Pure Stock the New STOCK !

Saw it coming !
Not sure it is a bad thing.
More racers will select these heads over time.
Hope it simplifies Tech seeing the same Head on more cars.

D

nolongerracing 12-22-2017 02:41 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Quote:
Originally Posted by Erik Jones (Post 552261)
Everyone needs to realize that we all need replacement heads if we want to continue to race Stock And Superstock. The replacement head has to have the same spec as the OEM it is replacing. This is no different than the FE Ford, Big Block Dodge and Big Block Chevy. If anyone thinks the port shape is worth something major in a .400" lift Stocker you probably read to many "High performance Books".
Just relax and grow with the times....
So... how do you plan on getting the 172 cc intake port down to 165 cc without epoxy or welding? That's the problem.

ron mattson 12-22-2017 02:55 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
the mopar 273 has a replacement head WAY bigger than factory cc so do some others, if you live in a humid climate you would welcome the not rusting property
of aluminum.

Erik Jones 12-22-2017 04:29 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Quote:
Originally Posted by nolongerracing (Post 552263)
So... how do you plan on getting the 172 cc intake port down to 165 cc without epoxy or welding? That's the problem.
Its actually pretty easy. Thats what we get paid to do.

KEN BUGAJ 12-22-2017 05:01 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Sounds like NHRA now has Crate Motors !

nolongerracing 12-22-2017 05:26 PM
Re: Aftermarket/Replacement Cylinder Head Rule Change
 
Quote:
Originally Posted by Erik Jones (Post 552271)
Its actually pretty easy. Thats what we get paid to do.
Ok... .140 off the intake rail and some extra, extra thick intake gaskets!!!


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