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Trucknut 02-08-2010 06:10 PM

Could someone tell me if Chevy made an LT1 in 1986? I'm looking at one with an AT that is said to be a 1986 with 76,000 miles on it. Supposedly from a Z-28.



old fords 02-08-2010 06:18 PM

not in 86. I believe it came out in 93

Trucknut 02-08-2010 06:21 PM

Thanks. I'm going to run the numbers. It might be a 96.

curtis73 02-08-2010 06:44 PM

Late 92 for vette, but for the most part they were in 93-96 vette, 93-97 in F-body and B-body.

BogiesAnnex1 02-08-2010 06:59 PM


Originally Posted by Trucknut
Could someone tell me if Chevy made an LT1 in 1986? I'm looking at one with an AT that is said to be a 1986 with 76,000 miles on it. Supposedly from a Z-28.



LT-1 is from 70 thru 72, it is a 350 inch Gen I small block.

LT1 (see the big (dash) difference in the name) is from 92 thru 96. It comes in 350 inches and a bunch of power outputs depending on vehicle year and model. There are aluminum heads used on the 'vette, Camaro, and Firebird and cast iron heads used on the Impala, Buick Roadmaster and a Caddy. There is a kissing cousin, the L99 of 263 inches and all iron that is often confused with being an LT1, it isn't. It shows up in B and d bodies so you've got to investigate which displacement you're looking at before plunking down your Visa card. The L99 uses a 3 inch stoke stuck in a 350 block one could come up with an injected, reverse cooled 302, food for thought. But both engines (LT1 and L99) are considered to be GEN II small blocks. They are injected from complex to really complex. They have the Optispark distributor on their noses. They are reverse cooled, heads first then block identified from the outside with a really gompy looking water pump and no radiator return hose from the intake. The L99 heads are the same design as LT1 but only in cast iron with smaller valves to fit the 3.74 inch bore. The heads can be made to interchange blocks between the LT1, L99, and LT4. however, they do not backdate to GEN I SBCs though the bolt pattern is the same, the coolant passages are not.

The LT4 was made for only two years 96 and 97. It looks a lot like an LT1 on the outside. It came with more cam and compression, bigger valves and ports, and with many of the Optispark's problems fixed. It comes only in 350 inches with aluminum heads that feature even better combustion chambers than the LT1 and have the usual bigger stuff as mentioned, plus they include roller 1.6:1 extruded aluminum rockers on bigger, but metric, studs.

Is this a great country or what?


Trucknut 02-09-2010 05:59 AM

Very interesting. Thank for all the help.


Trucknut 02-10-2010 07:37 AM

1 Attachment(s)
Sorry guys, I'm not having any luck identifying this engine. I know it's a 5.0L. That is clearly in the casting on the left rear of the block. But, it has been my experience that Chevys have an ID number on the front, right side of the engine (passenger side). I can't seem to find it. Any ideas?

Trucknut 02-10-2010 07:39 AM

Yes....I pulled the alternator to get a better look. Also, The head on the drivers side has the numbers 59378 stamped on the back. It has an aluminum intake and "TUNED PORT INJECTION" at the front, top over the intake. I'd also like to know the value of this engine, w/trans. It is said to have about 76,000 miles on it. As you can see, all of the harnesses are there.

SSedan64 02-10-2010 07:55 AM

Should have a Suffix # on block, right in front of Passenger side head.
Look up>> TPI started in 85.

Trucknut 02-10-2010 07:58 AM

Thanks SS. But, that's what I can't find.

SSedan64 02-10-2010 08:03 AM

It will be on the Block Deck, looking straight down not on front of block. Just in case you didn't know. Also some are more towards the center of the block and Oil fliter pad.

nick8 02-10-2010 12:12 PM

Looks like 305 TPI motor. It was available in 1986 (1985/86-1992) in camaros, firebirds, vettes.

zildjian4life218 02-10-2010 01:44 PM

sure looks like a tpi motor could be either a 305 or 350. the lt1 or lt4 i believe had different style runners. The went straight down from the plenum a lot like a holley stealth intake instead of out then back down and across.

Trucknut 02-11-2010 05:43 AM

I found the stamping numbers. It's a 305. The guy that owns it wants $1500 for it, but I doubt if it's worth half of that, based on market research. It was built in 1986 and said to be rebuilt. No documentation at all.

Once again....

Thanks guys :thumbup:


LS SIX 02-11-2010 06:07 PM

I bought my 1990 TransAm with a 350 TPI motor for $1500!

For what I see in the pic I would say $400-$500, add a hundred or so if theres a complete harness and ECU.

There should be a price differential for it being the lesser 305 but at this level it's all about what you want to spend and what he'll sell for but I bet he'll never move it for $1500, thet'll get you a complete LT1 swap or a basic LS1 long block easily. Bith are stronger and more desireable motors.

The engine code is LB9 by the way, L98 for the 350 TPI.

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