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5.3 lmg to 5.7 help

Old 10-11-2018, 09:43 PM
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Default 5.3 lmg to 5.7 help

What all would I need to do to make my 5.3 into a 5.7?
2012 silverado 5.3 6l80e trans
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Old 10-11-2018, 10:37 PM
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Originally Posted by IvAAssassin View Post
What all would I need to do to make my 5.3 into a 5.7?
2012 silverado 5.3 6l80e trans
Iron or aluminum block? The iron block can be bored to 5.7 specs, but I'm not sure the aluminum one can. Besides that, 5.7 pistons and rings are all you need. Call WS6store for this stuff. They'll give you a good deal and great service. They are a vendor/sponsor of this site. You will need a new tune after this, too.
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Old 10-11-2018, 10:38 PM
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Lmg cast iron with 799 heads
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Old 10-11-2018, 10:48 PM
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Originally Posted by IvAAssassin View Post
Lmg cast iron with 799 heads
Should be able to do it then. As I said, call WS6store for the required parts. They'll steer you to whatever else you need. They'll do you right!
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Old 10-11-2018, 10:50 PM
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I didnt wanna ask them till I was for sure I've already asked a bunch of questions about a 5.3 hot cam from them lol
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Old 10-11-2018, 10:57 PM
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They're good guys, and as long as you show that you're just not stringing them along they'll bend over backwards to help you. They know a lot of guys want to get a good idea of what to do in their heads before they cut loose with the long green, lol.
BTW, I hope you know that 799 heads are identical to 243's, so you know you already have pretty decent heads on that engine.
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Old 10-12-2018, 07:34 AM
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Ok cool and ya and I am still planning on porting and polishing them
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Old 10-12-2018, 11:12 AM
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Get them CNC ported. "Porting and polishing" is an old term. Nobody polishes anymore, as it's now known the CNC finish is as good as need be.
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Old 10-12-2018, 11:58 AM
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I'm getting texas speed to do them
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Old 10-12-2018, 02:34 PM
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Why are you starting so many many threads? Im sure i gave you all the info you needed in your original thread plus emails.

One thread will make it way easier to keep track of and use as reference for all of your questions.

As far as the 5.3 to 5.7 build goes, we have all the parts for less than a set of forged pistons. ALL of the parts.
The only thing youll need is a bore to piston size.
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Old 10-12-2018, 03:57 PM
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Ok thank you and I didnt want to ask you so many questions because I have already asked Alot
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Old 10-12-2018, 04:30 PM
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Originally Posted by [email protected] View Post
As far as the 5.3 to 5.7 build goes, we have all the parts for less than a set of forged pistons. ALL of the parts.
The only thing youll need is a bore to piston size.
^^^^^^^DO this! ^^^^^^^^^ One stop, no headache shopping...
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Old 10-12-2018, 06:24 PM
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Engine was changed out perhaps? LMG was a SUV engine, not a truck engine. My 2012 Silverado has an aluminum engine, and every other 2012 I’ve seen had an aluminum engine.
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Old 10-12-2018, 06:37 PM
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Originally Posted by IvAAssassin View Post
I'm getting texas speed to do them
I called them today about my heads on my LM7. Very friendly bunch.
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Old 10-12-2018, 07:34 PM
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I've been sincerely trying to avoid thread-jacking or making a whole new thread, but seeing as I have yet to get a definitive answer I'm going to ask it here....

I acquired an LM4 w/ 243 heads. It's an aluminum block 5.3L.

I want to do a "poor man's" LS1 by punching it out to 5.7L. My one question is.... Is it possible to do it safely without hindering reliability?
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Old 10-12-2018, 08:00 PM
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Originally Posted by RetroModChevy View Post
I've been sincerely trying to avoid thread-jacking or making a whole new thread, but seeing as I have yet to get a definitive answer I'm going to ask it here....

I acquired an LM4 w/ 243 heads. It's an aluminum block 5.3L.

I want to do a "poor man's" LS1 by punching it out to 5.7L. My one question is.... Is it possible to do it safely without hindering reliability?
With our ls1 conversion setup its 100% reliable for the life of the vehicle honestly. ive built iron and alum 5.7s years ago that are running today still.
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Old 10-12-2018, 08:03 PM
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Originally Posted by [email protected] View Post
With our ls1 conversion setup its 100% reliable for the life of the vehicle honestly. ive built iron and alum 5.7s years ago that are running today still.
I appreciate the answer, sir. Scooting over to your site now to check it out!
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