question about trucks
Sep 8, 2002 | 07:32 PM
#2
Adkoonerstrator
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Re: question about trucks
The 4.8L, 5.3L, and 6.0L motors are LS1 based. The 8.1L is a big block.
The 4.8L and 5.3L have smaller bores and strokes than your 5.7L. The 6.0L shares the same crank as your 5.7 but, has a 4" bore to give it a few extra cubes.
The truck blocks are all iron but, the new Envoy will have an all aluminum 5.3L motor starting in '03. I think the trucks will also start getting aluminum blocks but, I'm not sure about when that will happen.
There are more small differences with the fuel system, MAF, etc. but, the blocks and heads are all interchangeable. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
John
The 4.8L and 5.3L have smaller bores and strokes than your 5.7L. The 6.0L shares the same crank as your 5.7 but, has a 4" bore to give it a few extra cubes.
The truck blocks are all iron but, the new Envoy will have an all aluminum 5.3L motor starting in '03. I think the trucks will also start getting aluminum blocks but, I'm not sure about when that will happen.
There are more small differences with the fuel system, MAF, etc. but, the blocks and heads are all interchangeable. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
John
Sep 9, 2002 | 05:52 AM
#3
TECH Resident
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From: Baton Rouge, LA
Re: question about trucks
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by XLR8NSS:
<strong>The 4.8L and 5.3L have smaller bores and strokes than your 5.7L. The 6.0L shares the same crank as your 5.7 but, has a 4" bore to give it a few extra cubes.
John</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The 5.3 has the same stroke as the 5.7 and 6.0 (3.62), just different bores on each engine (3.78,3.90,4.00). AFAIK the cranks are all the same. The 4.8 has the same bore as the 5.3, but different stroke.
<strong>The 4.8L and 5.3L have smaller bores and strokes than your 5.7L. The 6.0L shares the same crank as your 5.7 but, has a 4" bore to give it a few extra cubes.
John</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The 5.3 has the same stroke as the 5.7 and 6.0 (3.62), just different bores on each engine (3.78,3.90,4.00). AFAIK the cranks are all the same. The 4.8 has the same bore as the 5.3, but different stroke.
Sep 9, 2002 | 06:08 AM
#4
GTO Forum Director
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From: Chicago (Elgin), IL
Re: question about trucks
The 6.0 and 8.1's will remain iron blocks at least in the pickups simply for HD usage.
Also, the 8.1 is a mixture of Old School Mark IV Big Block design with LS1 technical cues. The only way you'll be able to get the 8.1 is if you opt for a 2500HD (which is a single axle 1 ton truck) or a 3500 (which is the dually). Both also upgrade you to the the Allison 1000 series transmission which is a Godsend for towing but is a boat anchor for performance. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
You can also get a 2500 Avalanche with the 8.1 which you'll get the 4L80/85E transmission. THe Allison isn't an option here.
Also, the 8.1 is a mixture of Old School Mark IV Big Block design with LS1 technical cues. The only way you'll be able to get the 8.1 is if you opt for a 2500HD (which is a single axle 1 ton truck) or a 3500 (which is the dually). Both also upgrade you to the the Allison 1000 series transmission which is a Godsend for towing but is a boat anchor for performance. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
You can also get a 2500 Avalanche with the 8.1 which you'll get the 4L80/85E transmission. THe Allison isn't an option here.
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