Adaraas
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engineermike
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Not 100% sure on the heads but the gen3 has 4 knock sensors while the gen2 block can only accommodate 2.
EFI
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You physically can, but I would go with a gen 2 for a gen 2 or gen 1 block.
3-2-1 means gen 3 block, gen 2 heads, gen 1 timing.
3-2-1 means gen 3 block, gen 2 heads, gen 1 timing.
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