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Old Apr 29, 2012 | 10:41 PM
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Default 853 ls1 heads

are they worth a crap on a 5.3?
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Old Apr 29, 2012 | 10:50 PM
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They flow a little less then a 243 but they aren't bad. Pull the valves get a porting bit for aluminum and do some pocket porting. Clean up the exhaust runners. I have done it. Ran 10's.
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Old Apr 29, 2012 | 11:21 PM
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excuse my ignorance, but what is "pocket porting". should I port the intake side as well as the exhaust side?
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Old Apr 30, 2012 | 08:39 AM
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Only down side, is if they have the "notch" you can't run anything but stock graphite gaskets.
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Old Jul 30, 2012 | 12:47 PM
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Originally Posted by bww3588
Only down side, is if they have the "notch" you can't run anything but stock graphite gaskets.
http://www.summitracing.com/parts/FEL-26192PT/
You can use this gasket!
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Old Jul 30, 2012 | 01:46 PM
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Using those heads will drop compression...they will flow more than 5.3 heads but the lower compression will prob knock you down to like 9:1
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