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Discussion in 'The Garage' started by PsychoticDeadGuy, Aug 19, 2005.
What type of 5.7 350 do i have in my '87? Gen. 1, 2, or 3?
Gen I. LT1 is gen II, and Gen III is the new LS1, and the 4.8, 5.3 and 6.0 truck motors.
gotta love the 1st gens but its hard to argue with aluminum blocks and 6 bolt mains.
there is a gen iv now...engine in 05 gto and corvettes...not really much changed, except for the knock sensor location and the lifter valley is redesigned for the 4-6-8 crap.
i know from the choices its 1st gen but it is the 2nd or third design of that block, wouldn't it have passenger side dipstick and one piece rear main seal? maybe even centerbolt heads? Duntov Rocked
Actually that engine is nothing more than the 5.3 SBC and it is a 4-8 engine not a 4-6-8 engine and is only offerd in the Trailblazer based SUV's and the new front drive V8 powerd midsize cars like the Monte Carlo, Impala and Grand Prix.
Yes, in '86 IIRC Gm went to a one piece main seal and in '87 they went with the center bolt valve covers. Also, I think they started getting provisions to accept roller cams.
And GenIII all aluminum 5.7 346" found in camaros, corvettes, and t/a's.
so the 6.0 in the corvettes and gtos is actually a 5.3? i dont get it. the 05 6.0s are a gen iv but they dont have the 4-8 (excuse me), but they do have the castings for it.
That is the LS1. There are actually a bunch of different RPO versions of the Gen III engine.
yup. The "LS1" RPO really only applies to the 1997 engine when it first came out. so 98 up 5.7's aren't ls1 rpo's.
Since then, gen III motors have been generally referred to as LS1 motors.
the '04 corvettes and gtos were 6.0L not 5.3 Gen III motors just have those four displacemants... for now gm is supposedly coming out with a 427 smallblock gen III in '07
all gen III 5.7's are LS1s or LS6s
here is the others:
1998-present Generation 3 small-block pushrod V8 family:
1998-2004 LS1 - 5.7 L V8
2001-2004 LS6 - High-output LS1
LR4 Vortec 4800 - 4.8 L
L33 Vortec 5300 - 5.3 L
LM4 Vortec 5300 - 5.3 L
LM7 Vortec 5300 - 5.3 L
LQ4 Vortec 6000 - 6.0 L
LQ9 Vortec HO 6000 - High-output 6.0 L
2005-present Generation 4 small-block pushrod V8 family:
2005-present LS2 - 6.0 L
LS4 - 5.3 L Pontiac
2005-present LS7 7.0 L High-performance Gen IV engine
Separate names with a comma.