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Old 01-28-2005, 10:13 PM
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Ls1 question

well so far i havent heard anything other than the Ls1 is an amazing motor, im not very familiar with it but i think its 350ci and im looking for a good motor to rebuild for my 79 firebird and want some opinons on the LS1 or LS6 especialy if u have something bad about it to say cuz then i know wut i need to upgrade and if its a 350 i was going to 383 stroker kit it and put on twin turbo's too


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Old 01-28-2005, 11:14 PM
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the LS1, LS6, LT1 and the LT4 are all the same block. its a 5.7L V8, 349 cid. which is basically a 350. the only differnece between the 4 motors is configuration. cam, different size valves, different computers... the list goes on. but they are very good motors. i believe the biggest problem people have with them is the rear main seals like to blow out due to factory parts. rebuild it with high quality gaskets and i dont think you'll have any problems. if i've missed anything im sure others will correct me. good luck.
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Old 01-29-2005, 06:01 AM
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The LS engines and the LT engines are not the same block. The LS's are aluminum block with liners vs. the LT's cast iron. The cranks, cams, heads, intakes and virtually everything else are not interchangeable.
The LS engines are a deep skirted, cross bolted block that use a cast alum. oil pan. The valve arrangement is different between the two also. The LS's do not have a distributor and use a "reverse cooling" system. (first the heads then the block vs. the block first then the heads.)
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Old 01-29-2005, 09:47 AM
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As stated above, the LS line of smallblocks is a completely new generation of engine design from the LT's. Nothing interchanges from them.

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Old 01-29-2005, 09:55 AM
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If you are thinking about a switch to one of these motors, you would be much better off with a LS1. They are a much better designed motor. As far as draw backs, I really dont know of any mechanical problems, and you can get them for pretty good prices used. Another good thing, If you switch the cam and intake on a stock LS1, 450 hp is pretty easy.

Here are some ideas of how cheap you can get them

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