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ls6 heads on nnbs silverado

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Old 01-21-2008, 12:28 PM
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Default ls6 heads on nnbs silverado
Still wonrdering if ls6 heads will fit on a nnbs 5.3. Anyone try this yet?
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Old 01-21-2008, 12:56 PM
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Originally Posted by cbenavides06
Still wonrdering if ls6 heads will fit on a nnbs 5.3. Anyone try this yet?
Just FYI, I think the 243 heads come on the flex fuel nnbs. I thought they were on all others too, but I know my friend's '07 Avalanche 5.3 has the 243 heads for sure... What casting number are yours?
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Old 01-21-2008, 12:58 PM
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mine isn't flex fuel, and i have 243's. i think the 5.3 truck engine has smaller valves than the z06.
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Old 01-21-2008, 01:07 PM
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Originally Posted by SS_bnoon_SS
Just FYI, I think the 243 heads come on the flex fuel nnbs. I thought they were on all others too, but I know my friend's '07 Avalanche 5.3 has the 243 heads for sure... What casting number are yours?
actually it's random wen It comes to flexfuels.. the majority come with the 799 heads.. all the non-flexfuel nnbs come with 243s
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Old 01-21-2008, 01:13 PM
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Mine doesnt have all the flex fuel emblems. But whenever i ease off the gas it does say it shuts down to 4 cyl.Anyways, I was told to check the bore size on a 5.3 and an ls6. I didn't see any # on my heads
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Old 01-21-2008, 03:33 PM
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check the front outer corner of the passenger head.
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Old 01-21-2008, 03:35 PM
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My 4.8 came with the 243 heads
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Old 01-21-2008, 06:46 PM
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Originally Posted by cbenavides06
Mine doesnt have all the flex fuel emblems. But whenever i ease off the gas it does say it shuts down to 4 cyl.Anyways, I was told to check the bore size on a 5.3 and an ls6. I didn't see any # on my heads
Displacement on Demand has nothing to do with Flex Fuel. As for the valve size, not all 5.3L's have the same valve size.
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