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Old 07-22-2010, 09:24 PM
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94-97 chevy votec 350 swap

Hey ya'll just had a few basic questions about a 94-97 vortec 350 Vin (R) motor I'm putting it in my 89 S-10..The motor in it now is a 305 with 350 vortec heads an edelbrock intake and 650 carb just wanted to know if I can use my existing intake with the new vortec 350 also can I use my mechanical
fuel pump also..Any little bit of information would much help out I'm on a budget and kind of in a rush do to it's my every day driver..Want to keep the bottom end stock but would like a bigger cam I'm looking to get around 300hp.Thank you very much for any help and info...

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Old 07-22-2010, 11:22 PM
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Vortec heads REQUIRE a special intake. but vortec heads ran from 96-98, it almost sounds like your talking about TBI heads 88-95.

SOme roller blocks are machined for a mech. fuel pump
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Old 07-23-2010, 06:47 PM
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Quote:
Originally Posted by 89S-10trouty
Hey ya'll just had a few basic questions about a 94-97 vortec 350 Vin (R) motor I'm putting it in my 89 S-10..The motor in it now is a 305 with 350 vortec heads an edelbrock intake and 650 carb just wanted to know if I can use my existing intake with the new vortec 350 also can I use my mechanical
fuel pump also..Any little bit of information would much help out I'm on a budget and kind of in a rush do to it's my every day driver..Want to keep the bottom end stock but would like a bigger cam I'm looking to get around 300hp.Thank you very much for any help and info...
L31 Vortec starts in 1996 production with central port individual cylinder injection. The 94 and 95's would be the earlier L05 Swirl Port headed engine with TBI and OBD I computer technology.

All EFI blocks have no provision for a mechanical fuel pump. Neither do their cams. The block can be machined out, and an older cam used to get the pump lobe, but it's easier to just put on an electric pump.

Your Vortec heads and intake can be fitted to the earlier L05 Swirl Port engine and certainly to the 96 up L31.

Pre 1996 truck engines have a flat tappet cam, depending upon the block they may, or not, have provisions for a roller cam. The 1996 and up L31 will have a roller cam but it's timing is close to that of the wimpy L05 engine. The L31 can run the earlier flat tappet cams with a FT timing set. A Swirl Port TBI block can run a factory roller with the correct parts consisting of thrust plate, spider, lifter guides, shorter push rods, lifters and cam. If the TBI block isn't provisioned for the roller cam, it isn't worth trying to convert it, it's a pretty PIA job. The L31 uses a plastic timing cover, for a carb the electronic TDC sensor isn't required, an ordinary steel timing cover can be substituted.

All blocks from 1986 to end of production use a one piece rear seal. This requires a flywheel or flexplate that will accommodate the smaller bolt circle of the one piece crank flange.

The computer managed distributor of the both the Swirl Port TBI L05 and the Vortec L31 can be replaced with a conventional distributor, either HEI or points.

Bogie
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Old 07-23-2010, 09:30 PM
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Quote:
Originally Posted by oldbogie
L31 Vortec starts in 1996 production with central port individual cylinder injection. The 94 and 95's would be the earlier L05 Swirl Port headed engine with TBI and OBD I computer technology.

All EFI blocks have no provision for a mechanical fuel pump. Neither do their cams. The block can be machined out, and an older cam used to get the pump lobe, but it's easier to just put on an electric pump.

Your Vortec heads and intake can be fitted to the earlier L05 Swirl Port engine and certainly to the 96 up L31.

Pre 1996 truck engines have a flat tappet cam, depending upon the block they may, or not, have provisions for a roller cam. The 1996 and up L31 will have a roller cam but it's timing is close to that of the wimpy L05 engine. The L31 can run the earlier flat tappet cams with a FT timing set. A Swirl Port TBI block can run a factory roller with the correct parts consisting of thrust plate, spider, lifter guides, shorter push rods, lifters and cam. If the TBI block isn't provisioned for the roller cam, it isn't worth trying to convert it, it's a pretty PIA job. The L31 uses a plastic timing cover, for a carb the electronic TDC sensor isn't required, an ordinary steel timing cover can be substituted.

All blocks from 1986 to end of production use a one piece rear seal. This requires a flywheel or flexplate that will accommodate the smaller bolt circle of the one piece crank flange.

The computer managed distributor of the both the Swirl Port TBI L05 and the Vortec L31 can be replaced with a conventional distributor, either HEI or points.

Bogie
some cams have provisions for mech. fuel pump and also so do some roller blocks, i am looking at both right now, block is a 638, fully machined factory for roller and has 4-bolt main, one-piece rear and fuel pump spot fully machined, also, its cam (TBI) has a fuel pump lobe.
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