anybody running the gmpp ls6 heads?
12-12-2010, 11:02 PM
#1
anybody running the gmpp ls6 heads? i recently bought a set of gmpp ported and polished ls6 heads p/n 88958622. i was wondering if anybody here was running these heads and what kinda power and combos yal are running. times would also be nice. thanks
12-13-2010, 11:32 AM
#5
I thought those were discontinued from gm?!??!
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Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
12-13-2010, 11:46 AM
#6
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I ran them for about 5 years ran a best of 11.10's on motor and 10.40's @ 132 on N2O. This was a 383 and 4l60E combo. The castings are very thin in the throat area. The pass head developed a pin hole and leaked. It was hard to find the leak. They make ok power and the valves are very lite weight and strong. Put some good springs on them and you should be good to go. Oh they are milled alot , check you manifold port exit to the head inlet. My LS6 manifold fit good the Fast had some issues.
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12-13-2010, 12:36 PM
#8
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I know that LPE did the porting on those heads until 2007 and they milled them .055 and said they have 60cc chambers, but after 07, I think GM did the porting... Now they have 61.9cc chambers. I wonder how much they're milled now?
12-13-2010, 01:00 PM
#9
I ran them for about 5 years ran a best of 11.10's on motor and 10.40's @ 132 on N2O. This was a 383 and 4l60E combo. The castings are very thin in the throat area. The pass head developed a pin hole and leaked. It was hard to find the leak. They make ok power and the valves are very lite weight and strong. Put some good springs on them and you should be good to go. Oh they are milled alot , check you manifold port exit to the head inlet. My LS6 manifold fit good the Fast had some issues.
12-14-2010, 01:15 PM
#11
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I think they still sell the cnc 64cc non-milled version. Considering that the hollow and sodium filled valves are no longer available through GMPP,it's only a matter of time until the heads are no longer available too.
OP,see my sig for performance results. The nitrous shot was an additional 146 rwhp on the dyno.
OP,see my sig for performance results. The nitrous shot was an additional 146 rwhp on the dyno.
Last edited by david vericker; 12-14-2010 at 01:24 PM.
12-15-2010, 10:43 PM
#20
Cam specs are 246/250 627 in 630ish lift on a 112 dur and the wiseco pistons that are 11 cc valve reliefs I believe.And yes they are the ones that are milled 55 thous.,the car feels very strong and fast but im pretty sure im leaving some hp on the table do to the fact that they were not made for a 4" bore.But I purchased them brand new several years ago with the intentions for heads and cam but then decided to go all out with and LME 408.