79TA_6.6

Like it says, I need the mechanical differenced between the 2 engines, and also any reasons why american sports cars maybe better than japanease, and why pushrods arn't ancient types of engines.

bigsteve7

do a search for lt1 vs. ls1. this topic has come up a thousand times. I'm sure you can find everything you need to know in one of the older threads..

79TA_6.6

Tried that and I didn't come up with much actually, just general differences. I'm looking for mechanical differences, what is different internally and general.

PhantomTA

everything except bore spacing and lifters.. nothing else is the same..

79TA_6.6

alright, well how is everything different.

Erik 94TransAm

A search would turn up more.

Everyone calls pushrods acient- overhead valves came out first, then pushrods. (this is early 1900s)

LS1 = Aluminum LT1 = Iron

LS1 uses 4 bar Fuel Pressure vs LT1s 3 bar - long story short, this helps atomization.

LS1 has even valve setup - i e i e i e i e vs LT1 has e i i e e i i e e means less chance for hot spots between 2 exhaust ports.

LS1 internals can handle more power stock.

LS1 has a composite manifold - less heat soak.

LS1 has tubular cast manifolds - similar to a shorty header.

LS1 CR = 10.1 :1 LT1 = 10.5:1

LS1 has better flowing heads stock w/ more potential for porting.

LS1 has 1.7:1 rockers

That's all i feel like typing.

mike