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The mustang GT and 03 cobra blocks are cast iron. The 01 and earlier cobra blocks are aluminum. The best block that I know of is the mach 1 block. Its aluminum as well but the sleeves or something is thicker than the traditional cobra blocks
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2007 Z06--Bone Stock LS7
overpriced piece of plastic with a big ass motor
2006 Trailblazer SS:
TrickFlow 215's
Comp Cam 591/598
Fast 102
FLT Level VI
The DD
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