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post #1 of (permalink) Old 08-04-2002, 07:13 PM
dezelman
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4.3 liter questions

I have a K1500 short bed with a 4.3 liter and it says Vortec V-6 on the valve covers but the intake is TBI. I have never heard of a 94 pickup with vortec heads and tbi but I do know that the s10 trucks and blazers had a cpi vortec. If anyone has some info on this engine please let me know. Oh, and I also was wanting a better exhaust sound so I put a gibson cat-back system on and it seems like a lost some power and the sound it only good to about 2000 rmps and only under load doesn it sound good. If I am cruising it is just a drone and above 2000 it sounds like a drone type of sound. If anyone knows if removing the cat and/or putting on headers would give a better sound please let me know.

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post #2 of (permalink) Old 08-05-2002, 12:49 AM
 
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Re: 4.3 liter questions

It is a vortec engine, even though it has throttle body. As far as the exhaust, you robbed the engine of back-pressure. That's why you have a lack of power. Putting headers on and removing the cat, or installing a high-flow cat would lessen exhaust back-pressure even more, cutting down on torque. The engine was designed with a certain amount of back-pressure in mind, especially with a heavier truck. My advice is to put it back the way it was and drive it.
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