Join Date: Jun 2007
Location: Los Angeles, CA
Re: what are the main differences between a Gen IV and a Gen V block ?
Primary differences between a Gen IV and Gen V big block:
One piece rear main seal (instead of two on a GenIV)
Some changes to cooling passages (make sure to use the right heads / gasket, otherwise coolant will leak into the lifter valleys)
Block was lightened a fair amount, but cylinder wall thickness is not as great max overbore is .040 on GenV blocks where you could easily get 060 or 120 over on a GenIV
Fuel pump boss removed
They aren't necessarily truck blocks though most of them probably came from them. I am not sure if there were higher deck GenVs or not.
Hope this helps.
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