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.

 

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!

 

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

 

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.

 

Ok cool and ya and I am still planning on porting and polishing them

 

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.

 

I'm getting texas speed to do them

 

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.

 

Ok thank you and I didnt want to ask you so many questions because I have already asked Alot

 

^^^^^^^DO this! ^^^^^^^^^ One stop, no headache shopping...

 

 

I called them today about my heads on my LM7. Very friendly bunch.

 

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.

 

I appreciate the answer, sir. Scooting over to your site now to check it out!