Z28_DAD

iTrader: (18)

a friend of mine wants a ported and polished t/b and i said i would do it for him. but the GXP is his daily hoopty and cant have the downtime for me to do the p&p. i looked on ebay under LS4, but no t/bs came up. any other ones that will work?

TiredGXP

iTrader: (2)

I haven't come across one. (although my searching was mostly for an adapter from a 4 bolt throttle body to a three bolt intake flange)

My calipers tell me we have a 76mm TB, four bolt pattern. I believe the 5.3 truck engines have a 85mm TB, which won't match up too well to the intake.

Area47

COLORADO 04-05 Throttle Valve Assm; 3.5L
ENVOY 05 Throttle Valve Assm; 4.2L
TRAILBLAZER 03-05 Throttle Valve Assm; (4.2L)
HUMMER H3 06
BRAVADA 03-04 Throttle Valve Assm; (4.2L)
ENVOY XL 03-05 Throttle Valve Assm; 4.2L
ENVOY 03-04 Throttle Valve Assm; (4.2L)
IMPALA 06 Throttle Valve Assm; 5.3L
ISUZU ASCENDER 03-05 Throttle Valve Assm; 4.2L
GRAND PRIX 05-06 Throttle Valve Assm; 5.3L
ENVOY XUV 04-05 Throttle Valve Assm; 4.2L
TRAILBLAZER EXT 03-06 Throttle Valve Assm; 4.2L
CANYON 04-05 Throttle Valve Assm; 3.5L
MONTE CARLO 06 Throttle Valve Assm; 5.3L
TRAILBLAZER 06 Throttle Valve Assm; 4.2L
RAINIER 04-05 Throttle Valve Assm; 4.2L
SAAB 9-7X 05-06 6 cyl

Z28_DAD

iTrader: (18)

wow, all those are the same as the 5.3s in the GXPs?

Area47

yulp

Z28_DAD

iTrader: (18)

nice. if i can aquire one, expect to see ported and polished t/bs for sale soon

supercatxr7

iTrader: (5)

I'll take one if you do.

Z28_DAD

iTrader: (18)

ill make a thread once i get some done

supercatxr7

iTrader: (5)

You could do some type of core exchange. Send us one with a core charge, and then credit back once you receive core.

Area47

don't port them too much. they are super sensative

Z28_DAD

iTrader: (18)

i plan on doing a core exchange.
ive done plenty of LS1 t/bs, so im not worried about going too far

Mels SS

iTrader: (1)

Will the TB from the LS6 on the GTO bolt up and work?

Z28_DAD

iTrader: (18)

aparently not. its not on "the list".
but ill take it

TiredGXP

iTrader: (2)

IIRC, the GTO came with the LS1 with a cable operated three bolt TB or the LS2 with a 90mm electronic throttle body (4 bolt throttle body, but I believe the bolt spacing is different from the LS4 throttle body). I don't believe either will work.

SILVER LS4

I figure I will add this to the Throttle Body trilogy. The following was episode 2, titled "You Can Make the Shoe Fit, But You May Not Be Able To Wear It Because of Wiring Differences"
https://ls1tech.com/forums/ls4-performance/843096-different-tb-topic-revisited.html

Area47

don't "knife edge" the butterfly. this will cause severe idle issues. found this out the hard way.