GM Aluminum Heads

JCChildress · 08-12-2021, 03:35 PM

Did GM ever produce any performance based 23 degree, aluminum heads ? If so....how were they ?

FED 387 · 08-12-2021, 03:51 PM

GM #19300956 FAST BURN HEADS ---other wise everything was 18-15-12 degree- no idea how they worked no experience with them

Henrys Toy · 08-13-2021, 08:23 AM

Quote:

Originally Posted by JCChildress

Did GM ever produce any performance based 23 degree, aluminum heads ? If so....how were they ?

Good morning ,
In "as cast" condition, most of GM's cylinder heads ( stock or performance) are not to spectacular, flow wise. Quality of the castings are very good. The machine work from the factory is good, I would still strip them down and check your clearance's. In a performance application I would install bronze guide liners and perform a multi angle valve job on both intake and exhaust valves and seats..
The biggest operation is making sure the valve springs match the camshaft that you would be planning on using, be sure to get the open and close pressure's corrected. Also making sure the retainers clear the top of the valve guides and seals for the lift the camshaft will be opening.
Then check and equalize your combustion chamber CC's .
That's my two cents worth, new castings with up to date improvements are money well spent.

Respectfully,
Henry Kunz 1534 H/SA

Pat6868 · 08-13-2021, 03:34 PM

113 corvette head, also used on ZZ4.

FED 387 · 08-13-2021, 07:49 PM

AS I SAID the fast burn head ---same head as on ZZ4

Pat6868 · 08-14-2021, 11:45 AM

113 corvette(ZZ4) and 956 fast burns are not the same.

ron mattson · 08-14-2021, 01:24 PM

The Fast Burn heads are decent out of the box
but with a little work on the short side they become
Stellar!

JCChildress · 08-15-2021, 08:26 PM

What intake works good with them, on say a 327 super stock type engine ?

08-12-2021, 03:51 PM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,354 Likes: 335 Liked 280 Times in 150 Posts	Re: GM Aluminum Heads GM #19300956 FAST BURN HEADS ---other wise everything was 18-15-12 degree- no idea how they worked no experience with them

08-13-2021, 03:34 PM	#4
Pat6868 Junior Member Join Date: May 2010 Posts: 94 Likes: 5 Liked 66 Times in 21 Posts	Re: GM Aluminum Heads 113 corvette head, also used on ZZ4.

08-13-2021, 07:49 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,354 Likes: 335 Liked 280 Times in 150 Posts	Re: GM Aluminum Heads AS I SAID the fast burn head ---same head as on ZZ4

08-14-2021, 11:45 AM	#6
Pat6868 Junior Member Join Date: May 2010 Posts: 94 Likes: 5 Liked 66 Times in 21 Posts	Re: GM Aluminum Heads 113 corvette(ZZ4) and 956 fast burns are not the same.

08-14-2021, 01:24 PM	#7
ron mattson Member Join Date: Nov 2005 Location: cloquet mn Posts: 458 Likes: 15 Liked 54 Times in 26 Posts	Re: GM Aluminum Heads The Fast Burn heads are decent out of the box but with a little work on the short side they become Stellar! __________________ Ron Mattson 5015 STK

08-12-2021, 03:35 PM	#1
JCChildress Member Join Date: Apr 2007 Posts: 194 Likes: 7 Liked 9 Times in 4 Posts	GM Aluminum Heads Did GM ever produce any performance based 23 degree, aluminum heads ? If so....how were they ?

08-15-2021, 08:26 PM	#8
JCChildress Member Join Date: Apr 2007 Posts: 194 Likes: 7 Liked 9 Times in 4 Posts	Re: GM Aluminum Heads What intake works good with them, on say a 327 super stock type engine ?