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07 5.3 Heads

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Old 12-28-2006, 01:36 PM
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Default 07 5.3 Heads
i just noticed this on a 07 5.3 truck we got in the shop..they have 243 ls6 heads on them
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Old 12-28-2006, 01:38 PM
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Is it an aluminum block 5.3l??
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Old 12-28-2006, 01:41 PM
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Yes, do tell. Is this the 07 classic or the NNBS?
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Old 12-28-2006, 01:58 PM
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nnbs iron block
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Old 12-29-2006, 04:37 AM
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helll ya is that the increase in power ??
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Old 12-29-2006, 08:46 PM
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yep the 07 NBS come with the 243 casting heads, I drive one at work everyday lol, very smooth ride.
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Old 12-29-2006, 09:31 PM
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Originally Posted by v8
yep the 07 NBS come with the 243 casting heads, I drive one at work everyday lol, very smooth ride.
Take it home one weekend
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Old 12-30-2006, 12:15 AM
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Originally Posted by 1slow01Z71
Take it home one weekend
Better yet bring it to my house. I could use those heads
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Old 12-30-2006, 10:29 AM
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I checked the heads on my truck they are the old 862 castings for the LM7. But my truck is a "Classic" 07
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Old 12-30-2006, 12:57 PM
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yes they are the ls6 style 243 castings, but with the smaller valves from the 862 castings.
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