Supra_Shopper
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  • You have a 5.3 right? I am looking to swap in the LM7 peferably the lm4 because it is aluminum but i think it is going to be harder to find. But i was just wondering it you had the aluminim or cast iron block and if it was really that big of a change in weight and or handling? Also if you had any pointers on the swap? Thanks in advance. Justin
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