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Discussion Starter · #1 ·
The 5.3 block that I aquired shows that it can be bored out to make a inexpensive LS6.
BUT since the 5.3's and 6.0's use the same crank, what rods and pistons do i use? The 6.o's

Thanks. E
 

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From what I understand the crank and rods are the same specs. The bore and stroke of a 5.3 is 3.780 x 3.622. Rods are 6.098 in length. The iron block can be bored to an LS1 bore of 3.900. The aluminum block has sleeves and can be bored .010. So you can use your crank and rods and a set of LS1 pistons. The rotating assembly will probably have to be balanced. There is 4 versions of a 5.3; LM7 cast iron block, LM4 & L33 aluminum blocks and L59 is a flex fuel spin off. The heads on a L33 have a casting # 799 or 243 (last 3 digits) also have flat top pistons. LM4 has 862 & 706 casting # and dished top pistons. I am assuming the 799 head for the L33 model is best. But I have read you can have any of the heads ported and they will flow 300 cfm. Just try to keep compression ratio under 10.0. Check your block for the casting number 12551358 cast iron, aluminum blocks 12566910 & 12571048. Talk to a machine shop about performance camshaft. I know you can't go to big lift cams on vortec motors unless heads are reworked.
 

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Discussion Starter · #4 ·
I actually praised GOD for you.. Just a GOOD answer, no attitude or 'waste of time' opinions..

If any others have good info to share, 'cmon, lets have it.:thumbup:

I'm going out now to take a lood-see. I forgot what casting heads I got.
Thanks again.
E
 

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You can call the cam manufacturer and they can tell you what the most cam you can run with your heads. Also if you are boring to 3.9 you can run l92 heads for more power. Lots of good LS info on Ls1 tech website too.
 

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Discussion Starter · #6 ·
OK, the block is a 358 iron truck block with the 862 heads and dished pistons.

I wonder if I'll have to go 'bigger' on the injectors If I go to a 3.90 bore (346ci)? Or if I'll be able to just use these.
It will have to be bored out anyway, the kid that I traded with didn't tell me that all 4 cyls on the right had rust in them..
At least i should be able to find a complete set of STD bore for pretty cheap, or some used forged ones would be just dandy.

I'm on LS1tech also, I'll check that out.
E
 

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I actually praised GOD for you.. Just a GOOD answer, no attitude or 'waste of time' opinions..

If any others have good info to share, 'cmon, lets have it.:thumbup:

I'm going out now to take a lood-see. I forgot what casting heads I got.
Thanks again.
E
So my answer was a "waste of time opinion"? Screw you then. So wall thickness isn't an issue for you. I guess your engines do not obey the laws of physics.
 

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You can call the cam manufacturer and they can tell you what the most cam you can run with your heads. Also if you are boring to 3.9 you can run l92 heads for more power. Lots of good LS info on Ls1 tech website too.
According to an article in Chevy High Performance the L92 heads are not compatible to the 3.9 bore of the LS1. See this article: Performance Chevy LS Engine Comparison - Chevy High Performance Magazine. You can probably pickup most of the stuff from a auto recycler. You would use the fuel log, injectors, throttle body from a LS1 engine.
 

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Hi, I have been checking up at GMPARTSDIRECT.com for pistons, rings, camshaft. I don't like their website, they don't give you the part numbers. No telephone number to call. They want you to email them for info. I would go to the nearest GM dealer and go to parts dept. I would ask to check price on Cam, pistons, rings and what ever you want that factory parts. Get him to write the part# down for you. Then you can go to GMpartsdirect.com and order the parts for about 40% off. These LS motors are new to me I'm still a Gen1 big block fan. I would talk to a machinist about your build he may have a good deals on some parts. There is too much unknown! Especially I read if buying pistons from GM Performance Catalog they do not use stock rods. :confused: Good luck with your build.
 

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Discussion Starter · #10 ·
So my answer was a "waste of time opinion"? Screw you then. So wall thickness isn't an issue for you. I guess your engines do not obey the laws of physics.
WOW! Why would you take it that way? :confused:
Are you mad that someone ELSE got praise instead of YOU?

I was asking for the correct pistons to do so. And Cdminter59 gave up lots of good info with casting #'s! And MMadden55 reminded me of that site.
Not just for me, but others that might be looking for the same information..

I have already read and confirmed that the 358 block has enough wall thickness to take it out that far, where it doesn't state the same for other blocks..

E
 

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Well if you google search there's a bunch of threads about this and most people suggest stopping at 5.7 status. No all 5.3 blocks can hadle getting bored to a 6.0 cause it will be paper thin beteween the piston and water jacket. Just because someone doesn't give you the answer you're looking for doesn't mean you bash what they have to say.
 

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Discussion Starter · #12 ·
Wow again.. I didn't bash YOU.. You just didn't like MY reply.

I really don't feel like joining dozens of sites just to ask questions.
I joined THIS site because of the W I D E range of auto enthusiasts.. "One stop shopping" as it were.
In addition, this is the first LS based engine that I've acquired, and just asking questions about it.
I already purchased the book on them, and was just wondering if anyone else has/had been down the same road in building such an engine.

E
 
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