1995 K1500 5.7 TBI Intake Manifold?

[Schurkey]

This is going to be a whole lot of time, money, effort, and enthusiasm to gain an engine smaller than, and approximately as gutless as a worn-out 305.

I suggest re-thinking the entire project.

 

[L31MaxExpress]

Get the GMPP LT1 dual plane, TBI adapter plate and use the TBI distributor to eliminate the optispark. Did that on a 350 LT1 in a 95 years ago. It will need some changes to the chip tuning but both the L99 4.3L and 350 TBI make the same ~200 HP. The fueling at WOT thus will be similar. Idle might be a bit rich without some tuning changes.

 

[City-Slikker]

Get the GMPP LT1 dual plane, TBI adapter plate and use the TBI distributor to eliminate the optispark. Did that on a 350 LT1 in a 95 years ago. It will need some changes to the chip tuning but both the L99 4.3L and 350 TBI make the same ~200 HP. The fueling at WOT thus will be similar. Idle might be a bit rich without some tuning changes.

Right on thank you

 

[someotherguy]

Forgive the electrical mess the truck was a electrical mess since ive owned it.

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Curious where the water feed to the thermostat, and from there to the radiator, is gonna come from. No coolant passages in the heads up there?

Richard

 

[someotherguy]

Get the GMPP LT1 dual plane, TBI adapter plate and use the TBI distributor to eliminate the optispark. Did that on a 350 LT1 in a 95 years ago. It will need some changes to the chip tuning but both the L99 4.3L and 350 TBI make the same ~200 HP. The fueling at WOT thus will be similar. Idle might be a bit rich without some tuning changes.

$450+ for the intake alone.

Richard

 

[L31MaxExpress]

$450+ for the intake alone.

Richard

I still frequently see them used on Ebay, Offerup, Craigslist, FB Marketplace, etc.

 

[tayto]

Get the GMPP LT1 dual plane, TBI adapter plate and use the TBI distributor to eliminate the optispark. Did that on a 350 LT1 in a 95 years ago. It will need some changes to the chip tuning but both the L99 4.3L and 350 TBI make the same ~200 HP. The fueling at WOT thus will be similar. Idle might be a bit rich without some tuning changes.

the gm qjet to tbi adapter has provisions to run coolant in it. probably wouldn't be a bad idea on the unheated intakes of a gen2?

 

[98 Nitro]

the gm qjet to tbi adapter has provisions to run coolant in it. probably wouldn't be a bad idea on the unheated intakes of a gen2?

The big block TBI one? That would be a good idea.

$450+ for the intake alone.

Richard

Look at the price of the Vortec TBI one. $650, though like Max says you can find them on Marketplace/Craigslist for less than half those new prices. BTW A brand new crate TBI or Vortec engine from GM is $4500.

 

[tayto]

The big block TBI one? That would be a good idea.

Look at the price of the Vortec TBI one. $650, though like Max says you can find them on Marketplace/Craigslist for less than half those new prices. BTW A brand new crate TBI or Vortec engine from GM is $4500.

yea the BB one. about 15 years ago i had 2 of those GM vortec TBI intakes, I think i sold them for $200 canadian each....

 

[someotherguy]

The big block TBI one? That would be a good idea.

Look at the price of the Vortec TBI one. $650, though like Max says you can find them on Marketplace/Craigslist for less than half those new prices. BTW A brand new crate TBI or Vortec engine from GM is $4500.

I'm sure prices have gone up a bit in the past years but I used to sell good running TBI 5.7's from air cleaner to oil pan for $500-$650 (w/accessories), shown running before removal. What OP has is a 4.3 V8 with a steep hill of challenges to climb and is only alleged to be rebuilt. If it was my truck I'd be engine shopping, but I do understand one's desire to solve the problem in front of them instead of chucking it.

Richard