I have a 91 RS with a 305TPi and 5 speed. I also have a 96 350LT1 with the automatic tranny from a 96 Caprice. I would like to mate the LT1 to the 5 speed and put it in the Camaro. I have the wiring harness and computer from the Caprice. Is this a good idea and what do I have to do to make it run correctly (computer, etc..)

 

If that is the stock 5 speed, it will not last bolted to an LT1.

 

I am planning on rebuilding the 5 speed to make it stronger. I am just wanting to know if everything will hook up right and run right with the wiring harness and computer being for an automatic

 

https://www.thirdgen.org/forums/ltx-...ing-t-5-a.html
Not much but hope it helps.

 

Auto shouldn't make a difference, far as I know. As for mating up the trans, you'll need a flywheel for a 1pc rear seal engine ('87+ 305/350 IIRC), but thats about it I think. The 5-spd will be fine as long as you don't abuse it too much. Those iron head LT1s were rated only a little better than the L98 - something like 260hp/330ft-lbs or something. Aluminum head engines were a little higher because of a bit more compression and a slightly better cam... 275hp/345ft-lbs.

 

you sure its an lt1 not an l99 (4.3l baby lt1) only the cop caprices had the lt1s IIRC just given ya the heads up real fast. check the block number to be sure.....
10168588...265...94-96...2...L99, Gen.II, 4.3 Liter V-8, Caprice, reverse flow cooling

10125327...350...92-up...2 or 4...Gen.II LT-1, reverse flow cooling

 

The 5.7 could be had in normal Caprices, Impalas, Buicks, etc. I've seen it a bunch of times.

 

u do know visually the 4.3 looks just like the 5.7? im just saying that he needs to make sure cause most caprices had 4.3 l99s....

 

Yes, always check the block ID numbers. I was almost fooled once. A quick check is to decode the VIN. I believe the 8th digit should be P for the 5.7 and W for the 4.3. But the only positive way is to look on the block itself, as the motor could have been swapped out.

 

yeah my buddy when he was looking for another lt1 drove up to dallas (about 100 miles) to a junkyard that told him they had a corvette lt1 (he wanted the corvettes 4 bolt block) only to find when he checked the block number that it was a l99..he was pissed that he wasted the gas and time for nothing....

 

Yep, I know the 4.3 and 5.7 look the same. I know those cars came with them because I was a service advisor for a few years at a local shop, so it was part of my job to know for certain which was in the car, as it can make a difference in parts req'd, etc. Of all the non-F car/Y-car stuff that came in with a Gen II (L99, LT1) engine, it was about 50/50 between the 4.3 and 5.7 engines. The 5.7 is not particularly rare in those cars, as far as the Gen II engines go, but most had a Gen I 5.0 or 5.7 TBI engine, not a Gen II.

Anyway... the VIN code for the 5.7 is P, like on my '97 Z28, and on the side of the block, cast upside down, is the numbers '327'. Thats your giveaway of a 5.7 block. If you can see the rear of the engine pretty clearly, behind the drivers side head, on the bellhousing flange will be the complete block casting number as well as the original displacement size cast in as well ('4.3L' or '5.7L' will be cast right near the casting number).

 

ok well i wont argue with ya cause ur probably right i dont deal with non f bodies enough lol....all in all always double check block numbers is the point im wanting to get across though

 

lets not forget that it is not unheard of for the canadian lineup to be different than the american lineup. i have alway heard that the caprice had the l99 never that it had a 5.7 except cop cars, but to the op if you want a 100% sure answer ask the lt1 guys, and check your casting numbers.