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Generation III Internal Engine
Performance Differences?

Generation III Internal Engine 1997-2006 LS1 | LS6

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Performance Differences?

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Apr 4, 2009 | 04:17 PM

#1

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Performance Differences?

I have a 2003 Chevy Suburban with the 706 casting heads on the LM7 5.3ltr and have recently come across some 2000 Corvette LS1 Heads casting 853. The owner is willing to give me the CAM, Lifters, Push Rods, and Full Head Assembly for $275.00. Number one question is, are these heads compatible with my engine without major modifications? Number two question is are they really any better than the 706 series casting other than the slightly larger intake valves?

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Z

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Apr 4, 2009 | 04:27 PM

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853s are nothing special...not worth the trouble of swapping out. I have some 853 you can have for 50.00 if interested!!

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Apr 4, 2009 | 04:41 PM

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Would the 243's be better or is there a different option I should go with for the $?

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Apr 4, 2009 | 07:09 PM

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Does anyone else have any input???

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Apr 4, 2009 | 07:37 PM

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243's and 799 are some good flowing heads although they are the same(243's 799) but those other heads won't out flow these.

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