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Difference between 5.3 and 5.7 engines...

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Old 09-08-2002, 11:52 PM
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Default Difference between 5.3 and 5.7 engines...

The aluminum block engines that is. Are they pretty much the same block? Could a 5.3 be resleeved to the same dimensions?
What is the respective bore , stroke, etc...?
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Old 09-09-2002, 01:08 AM
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Default Re: Difference between 5.3 and 5.7 engines...

Right now the 5.3 is iron vs. the aluminum 5.7 but I heard a rumor of aluminum 5.3 in the near future. Here are some links for a few specs. http://www.gm.com/automotive/gmpower...ec5300_lm7.htm http://www.gm.com/automotive/gmpower.../gmpow/ls1.htm
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Old 09-09-2002, 08:59 PM
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Default Re: Difference between 5.3 and 5.7 engines...

They have announced a new LM5 5.3 aluminum vortec that will go in the 2003 Trailblazer. But not the Avalanche at this time.

Looks like the bore is the same... So potentially the newer 5.3 could probably be resleeved if someone wanted to.
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Old 09-09-2002, 09:20 PM
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Default Re: Difference between 5.3 and 5.7 engines...

What are the relative costs of each motor? I did an internet search for 5.3L crate motors but didn't find anything. I'm asking because I had a thread discussing the feasability of using the 5.3L in the future F-body as a midrange performance offering and I wanted to know if there'd be a significant price savings.
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Old 09-11-2002, 12:49 AM
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Default Re: Difference between 5.3 and 5.7 engines...

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by squirrels:
<strong>I'm asking because I had a thread discussing the feasability of using the 5.3L in the future F-body as a midrange performance offering and I wanted to know if there'd be a significant price savings.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">What future F-Body?

I don't know the costs.
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Old 12-19-2012, 12:35 PM
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I have a 2000 silvy 5.3L 4x4 that I want to twin turbo, and convert to AWD what's some good advice as to heads needed a a trans that'll hold at least 1000 horses, and I figure Dana 80s will hold up to that?
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Old 12-19-2012, 12:42 PM
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10 year old thread...if I were you is start a new thread.

Are you looking to go auto. Or manual tranny?
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