Quote: 4D55 engine is the same as the 4D56. 56 is just a head upgrade.
the 4D56 has different rods im pretty sure too. but basically identical engine
I know the bore is the same, but can't find any information on whether the block height is the same/different and the rod length is the same/different. I have the 4D56 specs but can't find the 4D55 specs. Anyone have the 4D55 specs on block height and/or rod length?
'94 LS, 3.0 V6, Auto, completely stock
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