Back in the day, I know there was a LS6 engine(427 i believe making 425), a LT1 engine(60's or 70's corvette), and i think even an LS7, but what was the original LS1.

 

LS6 = 454ci. famous in the 72 chevelle
LT1 = 350ci. famous in the 72? camaro
LS1 = 346ci. famous in our cars!

 

I was fairly sure there was a 60's LS1. And the LS6 started in 69 i believe.

 

LT-1 made it debut in the 70 Corvette.

It was also dropped in 70 Novas under a COPO order, and in Z28.

I believe the last LT-1s were built in 72.

 

LS6 = 454ci, 450 HP, 500 ftlbs, found in 1970 Chevelle. Highest rated FACTORY GM V8 even today.

LS1 = ??

LS2 = 455 Super Duty 310/290HP, 395 torque, found in 1973-74 Super Duty Trans Ams

LS5 = 455 H.O. Pontiac, 335 HP, 480 ftlbs, 1971 Trans Am
LS5 = 454 Chevrolet, 360 HP, 500 ftlbs, 1970-71 Chevelle, 1970-72 Corvette

LS7 = 454 Chevrolet, 460 HP, ??? ftlbs, crate engine never "officially" installed in Corvette

All engines besides the LS2 455 SD engine were rated in gross HP.(Typically net HP is 80% of gross rating.)

 

LS1= 400 Ram Air IV in 1970 Trans Am. 345hp@5400rpm 430lb-ft@3700rpm

 

thanks, im a big car history guy.

 

For the 70-72 350 it is LT-1 (note the hyphen). The LT1 is that wonderful (and most powerful stock chevy small block until the LS1) Gen II small block from 92-97.

 

didn't a corvette have a LT-1 in the early 70's

 

Correction, it's 390 HP. I just checked the plaque in my Father's 1970 Stingray.

 

My 72' Corvette's engine is actually an LS5 out of a 70' Chevelle. When I looked up the rating though, I believe it was 370 hp.

 

I thought LT-1 production started in 1968 or 1969 and was over in 1972. Could be wrong on that, but I remember a friend of mine owning an original 69 LT-1 Vette.

 

I could have sworn the LT1 made an appearance in the late 60's vette.

 

The LT-1 made its debut as an optional engine in the 1970 Corvette. It was also found in the 70 1/2 Camaro. The production run was 1970-1972.

 

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