what are the main differences between a Gen IV and a Gen V block ? - Team Camaro Tech
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post #1 of 3 (permalink) Old Jan 5th, 08, 01:42 PM Thread Starter
 
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what are the main differences between a Gen IV and a Gen V block ?

Just wondering what the main differences are between the Gen IV and Gen V blocks.
ALso, is the Gen V considered a truck block ?
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post #2 of 3 (permalink) Old Jan 5th, 08, 02:53 PM
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Ed
 
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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:

GenV
One piece rear main seal (instead of two on a GenIV)
Improved oiling
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.

Ed

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post #3 of 3 (permalink) Old Jan 5th, 08, 04:51 PM
 
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Re: what are the main differences between a Gen IV and a Gen V block ?

I just built a gen V 454. I used gen IV heads and gaskets on a V block. So far with no prob. But I have found that if you use V block and heads you must use V gaskets. Like said above there are some cooling passages changes.
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