Engine Swap Everything about swapping an engine into your Third Gen.....be it V6, V8, LTX/LSX, crate engine, etc. Pictures, questions, answers, and work logs.

305 TBI to 4.2-I6

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Old Jul 27, 2002 | 11:55 PM
  #1  
avro206's Avatar
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From: Calgary
Car: 89 Formula
Engine: 350
Transmission: TH 700R4
Axle/Gears: 3.27
305 TBI to 4.2-I6

Not that I can actaully do this anytime soon- but maybe if I'm stuck with the car a few years (it will be parked) I'll get her painted and do something about that lethargic POS under the hood.

Wonder about the length though- but it's 100hp more and 20lbs. Be pretty cool eh? Make it a 5spd
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Old Jul 28, 2002 | 12:33 PM
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From: Surrey, BC
Are you referring to the Vortec 4.2? Im assuming you are, you should read my post in the sticky at the top of the forum.
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Old Jul 28, 2002 | 04:45 PM
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From: Naples, FL
Car: 1991 Firebird
Engine: 383 stroker
Transmission: T-56
Why anyone would want to drop any 6 cylinder into a Thirdgen is beyond me in my opinion
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Old Jul 28, 2002 | 05:13 PM
  #4  
avro206's Avatar
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From: Calgary
Car: 89 Formula
Engine: 350
Transmission: TH 700R4
Axle/Gears: 3.27
it's called hotroding Quite a few people swapped 3.8 tirbos in Camaros- this would be a cool idea- extremely unique. It's one of GM's most advnaced engines-
featuring variable valve timing.
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Old Jul 28, 2002 | 05:46 PM
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From: Naples, FL
Car: 1991 Firebird
Engine: 383 stroker
Transmission: T-56
I don't exactly know if I would call running a straight 6 in a thirdgen hotrodding, but that's my opinion. If you're shooting for originality, then that's what you'll have for sure.
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Old Jul 28, 2002 | 07:44 PM
  #6  
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
if you want a 9 inch cowl induction hood and have thousands of dollars with nothing better to spend them on

why not?
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Old Jul 28, 2002 | 09:36 PM
  #7  
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From: Surrey, BC
Originally Posted By iroc22

The height of this block is 32.62", which will probably require some sort of custom hood.

Length is 32.86", making it roughly 3 inches longer than a V8. The 3 inches would probably not pose too big of a problem.

The inline six utilizes a 360* bellhousing, so you would need an adaptor to put the D-bolt TH700-R4 to it.

The electronics to operate the variable valve timing are very complicated, and would be a difficult swap until an aftermarket company like Painless steps in and clears a few things up.

The deep sump oil pan is a potential problem because of the F-Bodies crossmember. It may interfere.
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Old Aug 3, 2002 | 02:20 AM
  #8  
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From: Evansville,IN,USA
Car: 89' T/A, 00' Firehawk
Engine: 406 Roller
Transmission: TH700R4 w/2800 stall
Axle/Gears: 3.23 Posi
I saw a straight 6 in a 84 or so t/a in the junkyard last year, it was the strangest thing I have ever seen. My buddy and I were walking past it, stopped, went back, and said WTF? Anything is possible with enough time and money.
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Old Aug 3, 2002 | 10:53 AM
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From: Mays Landing NJ
Car: 2018 Camaro SS
Engine: LT1 w/Paxton 1500SL
Originally posted by Tom91Bird
Why anyone would want to drop any 6 cylinder into a Thirdgen is beyond me in my opinion

oh i beg to differ
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