Differences in LT1 vs. LS1 vs. GenII III IV V etc.

[Leadfoot]

I know the LT1 and LS1 are SBC but is it like a FI, TBI, TPI, MPI thing and the BBC have Gen#'s, anybody have a reference or know what differentiates each.

Thanks, just trying to add to my knowledge base.

 

[Pure Insanity]

LT1 is like our motors. The standard SBC. Cept the LT1 uses a cam driven water pump. But still "pretty much" the same. The standard SBC. The LS1 is a whole new critter. Aluminum block and heads, 6 bolt cross bolted mains, I read somewhere the cams are rifle drilled, and the heads are completly different. Nothing interchanges w/ our motors. Twiz will prob be much better at explaining all the differences than myself. The BBC gen#s I am not super familiar w/. I think some of the gens are 1 piece rear main, different cooling, Stuff like that.

 

[1Blazin71]

LT1 is also reverse cooled, and has that opti-spark timing controlled from the crank at the front.

 

[Blazer1970]

The LT1 ('90s version) is what is called the Gen II small block. The LS1 (aluminum block), and the new 4.8, 5.3, and 6.0 (iron block) truck motors are all Gen III family small blocks. The Gen II motor had only minor differences from 1st generation small blocks (55 and up), the reverse cooling being the biggest difference. The Gen III motors have no parts in common with the Gen I and II small blocks. It is a completely new design.