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Ring gap/forced induction recommendation ***carnage pics inside***

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Old 03-21-2012, 03:07 PM
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Originally Posted by smokeshow


Thought the 4.8 had a longer rod?
Yes, that is correct. The 4.8 rod is longer. Here's an early 4.8 piston/rod next to one of my 2005 L33 piston/rod. L33 is on top, 4.8 is the bottom.

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Old 03-21-2012, 03:47 PM
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Originally Posted by mcfarlnd
Chevy performance didn't have an issue when they pushed the 4.8 upwards over 28psi........
Never said the 4.8 or flat tops couldn't or could take more abuse. I consider them equal just one creates more compression. Also that magazine article cracks me up. Here is my version.....Twin t76's on a 5.3 or is it a 4.8
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Old 03-21-2012, 04:12 PM
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Originally Posted by chevybowtie
Never said the 4.8 or flat tops couldn't or could take more abuse. I consider them equal just one creates more compression. Also that magazine article cracks me up. Here is my version.....Twin t76's on a 5.3 or is it a 4.8
Pft a Lightening with a pulley swap is going to smoke you
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Old 03-21-2012, 04:22 PM
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Originally Posted by ak2007r6
Pft a Lightening with a pulley swap is going to smoke you
Does my Metco 100mm idler pulley count as a swap too or I'm I at a disadvantage? Don't want to wrestle with those ford boys.
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Old 03-21-2012, 04:45 PM
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Originally Posted by chevybowtie
Never said the 4.8 or flat tops couldn't or could take more abuse. I consider them equal just one creates more compression. Also that magazine article cracks me up. Here is my version.....Twin t76's on a 5.3 or is it a 4.8
Never said that you never said the 4.8 or flat tops couldn't or could take more abuse.........

Also, I measured the top of the top ring land to the top of the piston on both a LM7 5.3 piston and a 4.8 piston. Both are .175.
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Old 03-21-2012, 04:54 PM
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Originally Posted by smokeshow
IIRC, they gapped the **** out of the top ring lol....was something like .030.
correct. I don't remember a number being put in the article. I thought they just said "we had the stock piston rings gapped" but, I'm sure if they were contacted, they would be able to help out.
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Old 03-21-2012, 05:14 PM
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Rodger, sorry for your loss, i have nightmares of this happening to me. Good luck on the rebuild.
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Old 03-21-2012, 05:15 PM
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Originally Posted by mcfarlnd
Never said that you never said the 4.8 or flat tops couldn't or could take more abuse.........

Also, I measured the top of the top ring land to the top of the piston on both a LM7 5.3 piston and a 4.8 piston. Both are .175.
Right on. Put that to a rest. In the Hot Rod article they did mention in one of the captions that they opened the top rings up to I believe it was .028 or .030. I wouldn't go over .026 though. It's going to cause bleed off. Also one back at ya.
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Old 03-21-2012, 09:03 PM
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Originally Posted by chevybowtie
Right on. Put that to a rest. In the Hot Rod article they did mention in one of the captions that they opened the top rings up to I believe it was .028 or .030. I wouldn't go over .026 though. It's going to cause bleed off. Also one back at ya.
Touché sir. I missed the text in that pic.

From the article:
The one change we made to the short-block was increasing the gap of the top rings from 0.015 to 0.028 inch. Piston failures can usually be traced to the rings butting, sticking on the bore, and snapping the ring land. Extra ring gap cures this issue. If you look closely you can see the sizable rust stain midway down the No.8 cylinder.

Read more: Stock GM LS Engine - Big Bang Theory - Hot Rod Magazine
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Old 03-21-2012, 10:30 PM
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I think I'm on the right track here. We'll see what happens after she's back together.
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