4.8L to 5.7L LS6
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On The Tree
Joined: Feb 2004
Posts: 106
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From: North Georgia
4.8L to 5.7L LS6 Hi, I have a 1999 GMC Sierra with 4.8L and 4L60E tranny. I have been hording up parts to build an engine. So far I have the Ls6 crank, Ls6 rods, Z06 cam. Yesterday I bought a brand new LS6 block. And Yes, I plan on putting a Z06 motor in my truck. Any Ideas or comments would be appreciated.
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Joined: Sep 2002
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From: Azle/Saginaw, Tx
well, if you're gonna have the motor out already, get a different cam, that LS6 cam is great in a car but a turd in a truck. also, if you don't already have a set of heads, i know a guy (me) that has a set for sale that would kick **** on an LS6....as far as your internal motor, do you not have pistons yet? i would get a set of crower forged connecting rods (kick ***, and cheap) and a set of off the shelf forged pistons, that way if you decide down the road to spray it, you can spray double what you could otherwise.
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Joined: Sep 2002
Posts: 5,581
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From: Azle/Saginaw, Tx
the heads are LQ9 #317 casting heads with a full stage 2 port/polish, stock valve sizes, rev dual spring kit with harened seats and titanium retainers, all new parts used on the heads. as for a cam in a 5.7 i would go with something like the thunder 224 cam, it makes great power. i have a 222/226 .569/.573 112 comp grind for sale also. off the shelf pistons for a 5.7 are just ones that don't have to be ordered in a custom size, say 4.030 or 4.125", off the shelf is usually a very common size used, and 3.905 is definatly a very common size.
