yes you can find iron block 6.0 liter versions (lq9,lq4) of the alum block 5.7L (ls1,ls6) for about a grand and only gain about 90 lbs over the alum block. and yes alot of guys over on ls1tech have swapped (lsx type) engines into older muscle cars just check in the conversions and hybrids section. gm keeps adding to the ls family of engines there are probably 15 different sizes of engines setup 50 different ways to fit in most of gm's fleet
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