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The original castings for the 2 blocks probably started off very similar but go through a very different production process. They have the same bore and bore spacing but the
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01-04-2012, 04:43 PM
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A True Z Fanatic
 
Join Date: Mar 2009
Location: North East
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Drives: 09 370Z Sport M6
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The original castings for the 2 blocks probably started off very similar but go through a very different production process. They have the same bore and bore spacing but the VR38DETT is lined (using Ford's PTWA process) and pretty much everything else about the engines is different (crank, rods, pistons, heads etc).
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