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Old 08-16-2011, 07:41 AM
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chevy engine swaps

how much trouble is to swap a 1993 Chevy motor into a 1999 suburban with a vortex 350

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Old 08-16-2011, 07:52 AM
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I think you pretty much have to unbolt bolts and then reinstall them.

Maybe "lefty loosy righty tighty" would help? Honestly, just joking, I am not Chevy guy and could be off a hundred miles with my humor here but I think it is a direct bolt in.

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Old 08-16-2011, 07:54 AM
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The engine swap will bolt right in, depending on what you are running for fuel and ignition you may need to swap some parts over
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Old 08-16-2011, 07:57 AM
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Not much trouble at all. However, you`d have to make some changes. The `99 Vortec heads would have to be bolted on to the `93 block so the injection would bolt on. You would also have to lower the oil pan, remove the timing cover, (I`d install a new timing chain while I was in there) install the reluctor ring off the `99 Vortec, and the plastic timing cover so the crank position sensor would be in use. You`ll also have to use the Vortec 8 inch harmonic balancer which is made shorter to compensate for the reluctor ring thickness so the crank pulley would line up with the other accessories.
The `93 engine won`t make the power the Vortec engine does since the 99 engine uses a roller cam and the 93 uses a flat tappet cam. If the 93 engine has high miles it likely wouldn`t be a bad idea to replace the cam with a stocker unit while your in there or find a replacement flat tappet cam that matches the Vortec`s roller cam specs in LCA and duration @.050 figures.
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Old 08-16-2011, 12:42 PM
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Originally Posted by drbull
how much trouble is to swap a 1993 Chevy motor into a 1999 suburban with a vortex 350
Potentailly a lot these engines use totally different operating systems. The 93 and 99 systems are not interchangeable on a part basis, it has to everything from one or the other.

The 99 is OBD II Multiport injection and the 93 OBD I TBI. The computer from one will not drive the other.

The 99 uses Vortec heads and 93 uses Swirl Ports the heads have to match the intake as the bolt pattern is different. The intake has to match the injection system.

The blocks are similar but the front ends are different, these can be swapped with a little work. The 93 would need to take the 99 timing cover and damper assembly. The 99 heads, intake, injection, and distributor would have to be put on the 93 block.

Both blocks are one piece seal mains so the 93 will bolt to the 99 flywheel/flexplate.

Forget about going with the 93 TBI you'd have to touch all the underhood wire harnesses, change to the 93 fuel tank and pump, change a myriad of detail systems to get it to run. Lots of work way beyond the concept of fast and cheap. Not impossible, it's been done, but it ain't fast nor cheap to do at this level. But using the 93 as a short block is pretty quick and cheap to do.

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