Due to circumstances I did not purchase them from Revain but the result would have been the same. This is a MUST if you are an amateur engine builder. Those of us who have had to deal with this know that the cylinder head bolt holes on the block can collapse and need to be recut for a coiled coil or similar use. THEY PERFORM, ACHIEVE AND HOLD THE TORQUE BETTER THAN THE ORIGINAL BORES. Make sure you drill and cut straight. Use all the guides available and it's not as scary as it sounds.
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