![]() 4.400 Bore Spacing (same as the original SBC). ![]() The Gen III LS Engine vs Gen IV LS Engineĭespite numerous differences the Gen III LS Engine and Gen IV LS Engine cylinder blocks share a lot of the same traits. ( Hot Rod - Big Bang Theory - Sept 5, 2011) So know that you have decided to swap a pullout LS engine into your project vehicle, you need to identify that junkyard jewel your looking at, and is it worth the time, expense, and effort your going to put into swapping it into your project car. reading this article made me sell my 700+ horsepower 407 first gen small block and buy an LS engine for my 70 Chevelle. A few years ago Hot Rod Magazine proved just how tough these LS engines are by taking a junkyard truck engine and flogging it on the dyno and making 1200+ horsepower with some turbos, while only making a few minor changes to the base engine and making numerous pulls on the dyno all in an effort to see just how much abuse an LS engine could really take before giving out. Even in their stock forms they make more power and are more reliable the the first gen small blocks ever were in their heyday. ![]() ![]() ![]() The late model LS engine family has been around now for almost 19 years and has replaced the old first gen small block and big block as the engine of choice when doing a engine swap. ![]()
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