Trying to buy a LT1 the fellow says it's out of a vett witch I really dont want it if so. So I got him to get the #'s off the block looked them up said it was 92-up LT1 2 or 4 bolt I know all vetts where 4 bolt witch other way can I tell what year it is?

Not sure how to tell exact year, i know 93 Lt1's were speed density and not maf so u could ask if it has map or maf

I belive that the cam is different in the earlier years, check the cam #, but I could be wrong. Also 95 and up had the vented opti.

Here is a little more info:
"You can deteremine what year the engine is by looking at the front of the engine. A "vented" Opti, and not crank position sensor is a 95. An unvented Opti and no crank position sensor is a 94. A vented Opti and a crank position sensor is OBD-II 96/97".

The 92-93 doesn't have a front fuel crossover on the intake.

The 'vette LT1s have the fuel lines on the passenger side of the motor where as the F-body and other ones are on the driver side. Block castings are the exact same between the 2 bolt and 4 bolt blocks which won't help, as stated above, the opti is vented on the '95 and '96 versions, '96 will have a different timing chain cover.

Rebuilding the Chevrolet LT1 Engine, Doug Anderson, Automotive Rebuilder, September 1999

All you will ever want to know about an LT1.

ok thanks guys

96-97 has two knock sensors and a crank sensor on the bottom of the front cover.

Ok I have some pics looks like that the fule lines are on the drivers side If any one would take a look at them to see if they might know???

It looks like a '93 model since it doesn't have the crossover in the front of the intake but in the rear.

OK Thanks ALOT for your help!!!!!