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Feb 14, 2012 | 07:46 PM

#41

02'Z71ONDUBZ'

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From: Tahlequah/Norman, OK

Quote:

Originally Posted by TIM Z

So the newer 5.3's should be boost powerhouses also? I mean as they are they arent a slouch !

No, the pistons/heads aren't where the strength of the 4.8 comes from, its the shorter stroke that helps them resist detonation. Thats what differentiates them from all other LS based engines

Feb 14, 2012 | 09:19 PM

#42

slow67

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From: DFW

Quote:

Originally Posted by kbracing96

Compression is the same, 5.3 has a dish piston, 4.8 is flattop to make up the difference with the same heads. 4.8 has shorter stroke and longer rods. Both are about 9.5:1

I'm pretty sure all the NNBS 4.8s and 5.3s both have flat top pistons and 799/243s....making the LY2 4.8L 9.1:1 compression.

Feb 15, 2012 | 01:53 PM

#43

youngone2011

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Joined: Oct 2011

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From: Cypress, TX

I'm inspired now !!! My 4.8 will be there in December ... If not earlier

Feb 18, 2012 | 03:46 AM

#44

05RST2NV

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From: Brandon, MS

This thread dang sure got my attention.. Plans to pull the ole 4.8 and build a LS2 just got put on hold until i do some more homework on boosting a 4.8.....