SAE Technical Paper 970915 titled "1997 GM 5.7 Liter LS1 V8 Engine".
This paper is written by seven GM Designers and Engineers and relates the DESIGN of the (then) new LS1 engine. I cannot post the entire paper because SAE sells them at $12 bucks a copy ($9.60 for members). All the specs are in the back of the paper and there are numerous differences to the SBC/LT1. Overall block length is shorter, block width is wider, firing order was changed to reduce crank arm stress and improve main bearing life, the crankshaft nose was lengthened while the overall length of the crank is shorter by more than an inch. Side pods were added to the cylinder block and ventilation holes where added to the cylinder block bulkheads. In addition to these there are significant sealing systems, valve and head design differences, etc. that set the LS1 apart from the SBC/LT1. If you really want to know that the LS1 is NOT the SBC/LT1 "dressed up" but rather a new design, then I suggest you buy the paper. You might learn something. It's very technical but very interesting reading for us engineers.
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