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Yeah i can tell by looking at the valley if it has the bullseye or not. also if the block is super bright alum its an ls1 block where the 6 is dull dark silver.

hit or miss both years, my car bing an 01' that was built in aug of 00' had the ls6 block. something like 10% of V8 car prod between both years had them.

LS6 blocks your thinking of. All them came with the standard 241 heads yet.

Stay away from 98's too if u can too...