Manifold for CNC-Ported LS2 Cylinder Head
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Only the LQ9 came with the 317 heads, the LQ4 heads were different. There was a SWEET post on the 317 heads that someone recently deleted. 
Too bad, it was funny. The 317 is an LS6 port design with the 72 cc chambers as turd 
already posted. You would be far safer using those heads on a stock bottom end, but there are a few things (primarily rod bolts) I would look at changing if I were to go that route. You can pick up a good budget shortblock with forged rods, pistons, and ARP hardware for right around $3000, if you want it to last that would be the way to go.
Too bad, it was funny. The 317 is an LS6 port design with the 72 cc chambers as turd already posted. You would be far safer using those heads on a stock bottom end, but there are a few things (primarily rod bolts) I would look at changing if I were to go that route. You can pick up a good budget shortblock with forged rods, pistons, and ARP hardware for right around $3000, if you want it to last that would be the way to go.Rich
Last edited by rskrause; Nov 21, 2007 at 05:50 AM.
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Rich,
I will have to look in the shop what that PN is, but the 317 casting is found on all the Iron block 6.0L motors (LQ4 and LQ9)
With just a valve job you can pick up about 30cfm on the intakes and that's a cheap upgrade on a forced induction motor. Just had a set leave the shop for a STS Turbo 408 that's going in a truck.
The CNC ported LS6 heads are ok pieces, ports are huge and can easily be woken up with the correct valve job. They are around 305cfm out of the box from GM and that can be taken up to around 320cfm. They really scream for a larger valve and with that they can move more wind. Either way for the money you can get a better head.
Bret
I will have to look in the shop what that PN is, but the 317 casting is found on all the Iron block 6.0L motors (LQ4 and LQ9)
With just a valve job you can pick up about 30cfm on the intakes and that's a cheap upgrade on a forced induction motor. Just had a set leave the shop for a STS Turbo 408 that's going in a truck.
The CNC ported LS6 heads are ok pieces, ports are huge and can easily be woken up with the correct valve job. They are around 305cfm out of the box from GM and that can be taken up to around 320cfm. They really scream for a larger valve and with that they can move more wind. Either way for the money you can get a better head.
Bret
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Joined: Dec 1969
Posts: 10,745
From: Buffalo, New York
Rich,
I will have to look in the shop what that PN is, but the 317 casting is found on all the Iron block 6.0L motors (LQ4 and LQ9)
With just a valve job you can pick up about 30cfm on the intakes and that's a cheap upgrade on a forced induction motor. Just had a set leave the shop for a STS Turbo 408 that's going in a truck.
The CNC ported LS6 heads are ok pieces, ports are huge and can easily be woken up with the correct valve job. They are around 305cfm out of the box from GM and that can be taken up to around 320cfm. They really scream for a larger valve and with that they can move more wind. Either way for the money you can get a better head.
Bret
I will have to look in the shop what that PN is, but the 317 casting is found on all the Iron block 6.0L motors (LQ4 and LQ9)
With just a valve job you can pick up about 30cfm on the intakes and that's a cheap upgrade on a forced induction motor. Just had a set leave the shop for a STS Turbo 408 that's going in a truck.
The CNC ported LS6 heads are ok pieces, ports are huge and can easily be woken up with the correct valve job. They are around 305cfm out of the box from GM and that can be taken up to around 320cfm. They really scream for a larger valve and with that they can move more wind. Either way for the money you can get a better head.
Bret
Rich
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