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The first gens had a lousy transmission, got much better for 87+. Also for 87 or 88 can't remember which, the block got better as well. However if you're not looking for over 200hp or so, the stock stuff can be made to work just fine.



86 they went to 11mm headbolts, in 89 they went to common block.

The 86-88 block is pretty stout, they handle 300+ hp for years. I have had the 89 block over 440hp and 600 ft/lbs torque.

Never had a block failure either way.

Gary