LT1 vs LS1

03cavyTT · 03-15-2004, 08:52 PM

What is the difference between the LS1 and the LT1??

inspiron · 03-15-2004, 09:02 PM

power

Chevyracincamaro · 03-15-2004, 09:11 PM

the LT1 is refered to as the Generation II chevy small block and the LS1 is the Generation III. the LS1 was introduced in 1997 in the corvette and it showed up in the camaro in 98, before then it had always been the LT1. the LS1 was an all aluminum block with 6 bolt mains, while the LT1s in the fbodies only had 2 bolts. both engines had aluminum heads and the LT1s had a reverse coolant flow...

phantomz28 · 03-15-2004, 09:12 PM

wow ok ls1 is more aluminum lt1 has an iron block, th elt1 also has the optispark, the main downfal of the lt1. slao like inspiron said power. the lt1 i think are easier to ass nitrous to than the ls1. but exhaust and the dtributors are alot easier towork on ls1's

89IROC&RS · 03-15-2004, 10:08 PM

LT1 = old school small block with modern tech grafted to its aging body. same old 4in bore, 3.48in stroke. but because of the optispark/waterpump setup. the cam is different. it has the familiar distributor setup, better intake than a TPI, but same basic setup. the reverse flow cooling. the LT1 first came out in camaros in 1993. not sure about the vetts. and the aluminum heads were only on the LT1's in the vettes, camaro LT1's had iron heads. the ports on the intake for the LT1 go -II--II-, exhaust goes o-oo-o.

LS1 = not just a clean drawing board, a whole new one. this engine is the first small block chevy to be fully original since 1955. 3.9in bore, 3.62(?)in stroke six bolt mains standard, rather than the standard two bolt mains of older blocks, and optional four bolt mains. six bolt mains also have horazontal bolts rather than just splayed bolts. the cam is different, the heads use a elongated port that changes to a round hole at the valve, allowing more airflow, and a more direct path to the valve. the intake is composite, instead of the aluminum used before, and is seperated from the lifter vally by a metal "lid" over the vally bolted to the block. this setup virtually eliminates heat transfer from the engine to the intake charge. intake and exhaust ports are evenly spaced. and exhaust manifolds are better desighned and a bit more header like. and provide for less backpressure.

phantomz28 · 03-15-2004, 10:30 PM

my 97 z28 has aluminum heads and an iron block

89IROC&RS · 03-15-2004, 10:51 PM

???? did they do that at the end run?? cuz i know they were iron for most years.

phantomz28 · 03-16-2004, 02:00 AM

i think the 96 and 97 went to aluminum heads. they changed a whole lot the last 2 years. of the lt1's

FormulaLT1 · 03-16-2004, 02:21 AM

All F-body's & Vette's LT1's got aluminum head's , The Impala's and caprice's got Iron heads

phantomz28 · 03-16-2004, 11:52 AM

ah ha! i knew something seemed wrong with the f-bod having iron heads

89IROC&RS · 03-16-2004, 06:03 PM

um, not to my knowledge, i am quite sure that the camaros got the iron ones, cuz it was a very popular swap to put the corvette aluminum heads on the f-bodies, thats why around that time, the junkyards were littered with the Iron tpi heads. dont know about the changes in the last two years though.

phantomz28 · 03-16-2004, 07:21 PM

tpi is not an lt1 their similar but not the same.

89IROC&RS · 03-16-2004, 08:52 PM

sorry, typo, meant to say LT1.............. waiiiit a minute, i think i was talking about TPI's the whole time, but somehow connecting it to LT1's. yeah i think that was it. the TPI vettes got aluminum heads, the TPI F-bodies got iron ones, ok guys, sorry, i was on the wrong path up there, got my engines confused. but yeah, i know they are quite different. ignore all the crap i said up there. my nice little brainfart for the evening.

Chevyracincamaro · 03-16-2004, 10:28 PM

its ok 89 we know you got the whole third gen thing going on. however, what about the LT4 and the LS6, they were the same engine blocks just with different heads and cams and stuff right? i know the LT4 has a diff intake manifold also, but i dont know much about the LS6. they were both corvette motors right, or am i mistaken?

caw333 · 03-16-2004, 10:42 PM

Yea, all camaros came with aluminum heads on the LT1s. My 95 has aluminum heads. As for as the LT4 and Ls6 that is the same comparison as the LT1 and LS6. The LT4 is a corvette engine with better heads intake, cam, and roller rockers giving it more HP over the LT1. The LT1 can be upgraded to a LT4 but the LS6 is still a differant creature.

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