End of year HP

[PJ305]

Originally Posted by Nmbr1GMfan

Can someone enlighten me on this?
"Chev 62-79 added SBC replacement heads for Stock"

NHRA has approved 4 aftermarket cylinder heads for SBC stock engines for 2018. It's up to you to look up your engine in the guide and choose the ones listed for your combo,

[Nmbr1GMfan]

Originally Posted by PJ305

NHRA has approved 4 aftermarket cylinder heads for SBC stock engines for 2018. It's up to you to look up your engine in the guide and choose the ones listed for your combo,

RHS Cast Iron heads # 12400 & 12402 accepted as replacement head

Edelbrock heads # 60887, 60637 accepted as replacement head

Dart Cast Iron heads with cast # 10021070, 100220010 accepted as replacement head

World Products Cast Iron heads with cast #'s 043600 & 043610 accepted as replacement heads

Got it thank you, I see a +5hp goes with these too.

[Hacksaw]

Me thinks a smell a crate motor near bye.

[MR DERBY CITY]

Originally Posted by Hacksaw

Me thinks a smell a crate motor near bye.

Yeah, those small block Chevy heads are so hard to find....gimme a freakin break.....for 2019 I guess we can all run holleys since the q jets are so hard to find....CRATE MOTORS.........My sincerest APOLOGY to any IHRA crate motor racer that I ever offended.....

[rboyle]

Originally Posted by Nmbr1GMfan

RHS Cast Iron heads # 12400 & 12402 accepted as replacement head

Edelbrock heads # 60887, 60637 accepted as replacement head

Dart Cast Iron heads with cast # 10021070, 100220010 accepted as replacement head

World Products Cast Iron heads with cast #'s 043600 & 043610 accepted as replacement heads

Got it thank you, I see a +5hp goes with these too.

It looks like the Edelbrocks are an aluminum casting and come with 2.02 intakes instead of the 1.94. Would this still be a legal replacement but + 5 hp?

[Nmbr1GMfan]

Originally Posted by rboyle

It looks like the Edelbrocks are an aluminum casting and come with 2.02 intakes instead of the 1.94. Would this still be a legal replacement but + 5 hp?

I noticed that too, the 60637 and 60887.

[M Brand 505B]

Keep in mind these heads still have to CC and have the same valve size as the head you're replacing.

[B Aceves]

Originally Posted by M Brand 505B

Keep in mind these heads still have to CC and have the same valve size as the head you're replacing.

How will they ever know !
No tech
No tear down.
= what a can of worms and bs someone has opened.

[X-TECH MAN]

Originally Posted by b aceves

how will they ever know !
No tech
no tear down.
= what a can of worms and bs someone has opened.

lol.....................................

[Alan Roehrich]

Originally Posted by M Brand 505B

Keep in mind these heads still have to CC and have the same valve size as the head you're replacing.

Are you really sure about that?

The GMPP 401 head is actually an Edelbrock head (and in fact, the Edelbrock head itself is now approved), I'd strongly suggest that you look at the difference in specs for it and the rectangle port closed chamber heads it replaces. It (the replacement head) has its own chamber cc, port cc, and exhaust valve size.