Aftermarket/Replacement Cylinder Head Rule Change - Page 4

jmcarter · 12-22-2017, 01:20 PM

Quote:

Originally Posted by M Brand 505B

The Aftermarket head has to retain the same specs as the head it's replacing.

....

HR9121 · 12-22-2017, 01:25 PM

Junior Super Stock

PJ305 · 12-22-2017, 01:29 PM

Quote:

Originally Posted by Bob Mulry

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

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

Quote:

Originally Posted by HR9121

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

Quote:

Originally Posted by Erik Jones

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

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

Quote:

Originally Posted by nolongerracing

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

Sounds like NHRA now has Crate Motors !

nolongerracing · 12-22-2017, 05:26 PM

Quote:

Originally Posted by Erik Jones

Its actually pretty easy. Thats what we get paid to do.

Ok... .140 off the intake rail and some extra, extra thick intake gaskets!!!

12-22-2017, 01:25 PM	#32
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,467 Likes: 146 Liked 3,363 Times in 731 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change Junior Super Stock __________________ James Williamson W200 J/SA. SS/JA

12-22-2017, 01:35 PM	#34
Erik Jones Junior Member Join Date: Nov 2010 Posts: 61 Likes: 1 Liked 47 Times in 6 Posts	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.... __________________ Erik Jones

12-22-2017, 02:55 PM	#37
ron mattson Member Join Date: Nov 2005 Location: cloquet mn Posts: 466 Likes: 17 Liked 67 Times in 30 Posts	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. __________________ Ron Mattson 5015 STK

12-22-2017, 05:01 PM	#39
KEN BUGAJ Member Join Date: Nov 2001 Location: LEXINGTON NC. Posts: 389 Likes: 43 Liked 18 Times in 7 Posts	Re: Aftermarket/Replacement Cylinder Head Rule Change Sounds like NHRA now has Crate Motors ! Last edited by KEN BUGAJ; 12-22-2017 at 05:03 PM.