Big boost with rectangular port heads? Step inside
I have the 823s (ported and milled slightly by WCCH) and they are perfectly happy at 22lbs. Never had a gasket issue or lifted a head (knock on wood) using ls9 gaskets and standard arp studs.
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Use LSA heads or LS9 heads. I am almost positive they are the same castings with different size bolt holes anyway. A member a week or 2 ago cut apart a bunch of GM heads he did 243's 317's LS3 ,LSA,LS7s (I believe LS7s as well).
The LSA/s had internal webbing around all the bolt holes, slightly thicker deck and made of a much higher grade aluminium. He claimed he needed to actually use a good cutter to get through the LSA head. Where the LS3 head was the softest of them all.
I run the LSA heads with a LS3 intake no issue beside grinding off 1 plastic locater tab on the LS3 intake. A L92 Vic Jr bolted right on as well but it is really tall for a 4th Gen under the hood.
In my opinion the LSA heads are hands down the BEST stock casting head for boost. Probably will pick up a ton of power from them as well compared to a hogged 317. If I am not mistaking they are 265cc as cast intake runners. Keeping the ports small to maintain runner velocity isnt such an issue when its pressurized lol.
The LSA/s had internal webbing around all the bolt holes, slightly thicker deck and made of a much higher grade aluminium. He claimed he needed to actually use a good cutter to get through the LSA head. Where the LS3 head was the softest of them all.
I run the LSA heads with a LS3 intake no issue beside grinding off 1 plastic locater tab on the LS3 intake. A L92 Vic Jr bolted right on as well but it is really tall for a 4th Gen under the hood.
In my opinion the LSA heads are hands down the BEST stock casting head for boost. Probably will pick up a ton of power from them as well compared to a hogged 317. If I am not mistaking they are 265cc as cast intake runners. Keeping the ports small to maintain runner velocity isnt such an issue when its pressurized lol.
Use LSA heads or LS9 heads. I am almost positive they are the same castings with different size bolt holes anyway. A member a week or 2 ago cut apart a bunch of GM heads he did 243's 317's LS3 ,LSA,LS7s (I believe LS7s as well).
The LSA/s had internal webbing around all the bolt holes, slightly thicker deck and made of a much higher grade aluminium. He claimed he needed to actually use a good cutter to get through the LSA head. Where the LS3 head was the softest of them all.
I run the LSA heads with a LS3 intake no issue beside grinding off 1 plastic locater tab on the LS3 intake. A L92 Vic Jr bolted right on as well but it is really tall for a 4th Gen under the hood.
In my opinion the LSA heads are hands down the BEST stock casting head for boost. Probably will pick up a ton of power from them as well compared to a hogged 317. If I am not mistaking they are 265cc as cast intake runners. Keeping the ports small to maintain runner velocity isnt such an issue when its pressurized lol.
The LSA/s had internal webbing around all the bolt holes, slightly thicker deck and made of a much higher grade aluminium. He claimed he needed to actually use a good cutter to get through the LSA head. Where the LS3 head was the softest of them all.
I run the LSA heads with a LS3 intake no issue beside grinding off 1 plastic locater tab on the LS3 intake. A L92 Vic Jr bolted right on as well but it is really tall for a 4th Gen under the hood.
In my opinion the LSA heads are hands down the BEST stock casting head for boost. Probably will pick up a ton of power from them as well compared to a hogged 317. If I am not mistaking they are 265cc as cast intake runners. Keeping the ports small to maintain runner velocity isnt such an issue when its pressurized lol.
I know they are aftermarket, but these are the ones I'm going with. Will also be spring before testing them. They have .750" deck & 6-bolt for down the road if needed.
http://www.texas-speed.com/p-4008-pr...der-heads.aspx
http://www.texas-speed.com/p-4008-pr...der-heads.aspx
