replacement Stock heads

Dave1695 · 05-06-2021, 10:17 AM

The 291 castings on my 67 350 Stock eliminator engine are about used up. Of the listed acceptable replacement castings (Dart, RHS, World), is there any one part number that is a better starting point, than the rest. Finding old original castings worth buying, has not been successful. Appreciate any input or personal experience.

Angelo DiTocco · 05-06-2021, 11:26 AM

Factory 462's and 041's are accepted on that application too.

Henrys Toy · 05-06-2021, 11:51 AM

The small valve ( 1.94/ 1.50 ) 186 castings should also be good.
Check for ex. seat cracks in the two center cylinders and if they are not cracked, those would be about the Best Stock castings to use.
As per usual if you can find a couple of pairs, crack check and flow test then picking the best pair. You should be happy with the final outcome.

Bobby Lundholm · 05-06-2021, 11:56 AM

Quote:

Originally Posted by Dave1695

The 291 castings on my 67 350 Stock eliminator engine are about used up. Of the listed acceptable replacement castings (Dart, RHS, World), is there any one part number that is a better starting point, than the rest. Finding old original castings worth buying, has not been successful. Appreciate any input or personal experience.

If you can find older Dart castings those would be best. Any of the new Dart castings are 180 cc + intake runners. You can't make the small enough to get to 165.

Terry Cain · 05-06-2021, 05:09 PM

Quote:

Originally Posted by Dave1695

The 291 castings on my 67 350 Stock eliminator engine are about used up. Of the listed acceptable replacement castings (Dart, RHS, World), is there any one part number that is a better starting point, than the rest. Finding old original castings worth buying, has not been successful. Appreciate any input or personal experience.

Please correct if I'm wrong but I didn't think any of the replacement heads were legal for a stocker because of the volume numbers . Am I wrong?

SDT1DYI · 05-06-2021, 10:18 PM

They are legal so long as the runner volumes meet the OEM stated requirements. 165 CC SBC intakes are difficult to get down to. 161 CC is near impossible.

RHS heads I don't believe are manufactured any longer?
Hard to understand how some of these heads become approved by NHRA when in fact none actually "in a out of the box condition" are legal.
So a lot of machining and innovation is necessary to get them to pour correctly.
Making it expensive compared to using a good condition OEM casting and you then have no HP penalty.

Steve Teeter STK/SS 620

Dave1695 · 05-07-2021, 09:10 AM

Some aftermarket castings are accepted with a 5 HP penalty. I have been shopping for a pair of untouched castings without success so far. Will look for older Dart castings now too, thanks guys!

Bobby Lundholm · 05-07-2021, 10:43 AM

Quote:

Originally Posted by Dave1695

Some aftermarket castings are accepted with a 5 HP penalty. I have been shopping for a pair of untouched castings without success so far. Will look for older Dart castings now too, thanks guys!

Give Chris Hardy a call 231-740-5862 he does my cylinder heads and he's a wealth of knowledge.

B/S 428 · 05-07-2021, 12:16 PM

All American Classics in Vancouver Wa has used OEM heads.

05-06-2021, 10:17 AM	#1
Dave1695 Member Join Date: May 2009 Posts: 160 Likes: 0 Liked 15 Times in 11 Posts	replacement Stock heads The 291 castings on my 67 350 Stock eliminator engine are about used up. Of the listed acceptable replacement castings (Dart, RHS, World), is there any one part number that is a better starting point, than the rest. Finding old original castings worth buying, has not been successful. Appreciate any input or personal experience.

05-06-2021, 11:26 AM	#2
Angelo DiTocco Senior Member Join Date: Dec 2001 Location: NY, NY Posts: 737 Likes: 162 Liked 174 Times in 39 Posts	Re: replacement Stock heads Factory 462's and 041's are accepted on that application too. __________________ Angelo DiTocco '98 Firebird SS/HA '98 Firebird B/SA

05-06-2021, 11:51 AM	#3
Henrys Toy Member Join Date: Oct 2020 Posts: 254 Likes: 3,448 Liked 496 Times in 167 Posts	Re: replacement Stock heads The small valve ( 1.94/ 1.50 ) 186 castings should also be good. Check for ex. seat cracks in the two center cylinders and if they are not cracked, those would be about the Best Stock castings to use. As per usual if you can find a couple of pairs, crack check and flow test then picking the best pair. You should be happy with the final outcome.

05-06-2021, 10:18 PM	#6
SDT1DYI Member Join Date: Nov 2016 Location: Indianola Washington Posts: 364 Likes: 0 Liked 402 Times in 130 Posts	Re: replacement Stock heads They are legal so long as the runner volumes meet the OEM stated requirements. 165 CC SBC intakes are difficult to get down to. 161 CC is near impossible. RHS heads I don't believe are manufactured any longer? Hard to understand how some of these heads become approved by NHRA when in fact none actually "in a out of the box condition" are legal. So a lot of machining and innovation is necessary to get them to pour correctly. Making it expensive compared to using a good condition OEM casting and you then have no HP penalty. Steve Teeter STK/SS 620

05-07-2021, 09:10 AM	#7
Dave1695 Member Join Date: May 2009 Posts: 160 Likes: 0 Liked 15 Times in 11 Posts	Re: replacement Stock heads Some aftermarket castings are accepted with a 5 HP penalty. I have been shopping for a pair of untouched castings without success so far. Will look for older Dart castings now too, thanks guys!

05-07-2021, 12:16 PM	#9
B/S 428 Junior Member Join Date: Jan 2011 Posts: 83 Likes: 15 Liked 144 Times in 30 Posts	Re: replacement Stock heads All American Classics in Vancouver Wa has used OEM heads.