Depends on the bore size. Apples to Apples the IA II is 5 to 10 pounds heavier because the main webs are 1’’ wide (thick), the deck is thicker and the valley walls are thicker. All redesigned over the IA I block for improvements.
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 Bob C.
Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads
Boss Bird Funny Car
Best pass to date 08/06/2016 [email protected]
Allpontiac Big Chief Aluminum Engine Block
http://www.AllPontiac.com
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