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Punching a 5.3L out to a LS1

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Old 08-28-2013, 11:45 AM
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Originally Posted by cruisin'73
Good point, since when has any of this hotrod stuff been about making sense...we throw cubic piles of $$ and days of time into these cars so that we can break parts and refill the tanks. Obviously common sense left us long ago!

Best of luck on the build!

That's the best way I've ever heard it put! lol... Thanks! Hopefully it'll turn out and make some decent power.
Old 08-28-2013, 12:19 PM
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The 5.3 with a good cam and a decent set of heads will make comparable power to what you have planned for the iron 5.7. And probably come in cheaper.
Old 08-28-2013, 08:15 PM
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Im building an lm7 that I had bored to 346 ci, I only did so because I found a set of brand new unused piston rod combo from a crate ls1 for cheap. machine work with new cam bearing install was pretty reasonable. its hard finding a 6.0 in my area for a good price.
Old 08-28-2013, 09:36 PM
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An LS iron block is about a hundred pounds more than LS aluminum block.

You have the opportunity to remove the equivalent weight of almost three lead-acid batteries by using an aluminum block. Instead of jumping through hoops to increase a 5.3 motor by .2 liters for "that big jump in displacement", I'd say you'd be better off finding a 6.0 aluminum motor somewhere.

And you won't have to fool around with crank balancing or anything else.



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