What is the internal difference between the 5.3, LS1, LS6?

[t72ss402]

What is the internal difference between the 5.3, LS1, LS6?

I have a chance to get a camaro with an LS6 in it right now. The guy also has an STS turbo kit w/ the GT67 and new forged internals for the engine.

I was wondering if you could bore the 5.3 out, the pistons he has is 25mm over speed pro forged, rods are scat.

Is the factory crank good enough for the power levels that the turbo system has the potential of producing?

Thanks for any help?

[Steve1968LS2]

bore size.. piston shape.. Both are different in the 5.3L

Same crank as 5.7 ..

You can bore a 5.3 block to a 5.7 block, especially the iron 5.3Ls

Depends on the crank, lots of guys regularly abusing them. I would start to get worried over 600 hp though, not that it couldn't be done.

[t72ss402]

Steve,

The pistons he has are the 25mm over the stock LS1 bore. I am looking at using just a truck 5.3 block. I beleave I have read about the cylinder walls thinning out to much. Have you heard of any of these problems?

And I really like your qoute "A ship in port is safe, but that's not what ships are built for." Are you or were you in the navy?

[Twentyover]

25mm? 1 inch? Sure you don't mean 2.5mm? Don't think any lock can handle a 25mm overbore unless you wet sleeve it

[Steve1968LS2]

Steve,

The pistons he has are the 25mm over the stock LS1 bore. I am looking at using just a truck 5.3 block. I beleave I have read about the cylinder walls thinning out to much. Have you heard of any of these problems?

And I really like your qoute "A ship in port is safe, but that's not what ships are built for." Are you or were you in the navy?

Oh, I don't think you can bore it that far. lol -- 25mm is HUGE, double check that. After all the diff between a 5.3 and a 5.7 is only a couple of millimeters.
The good news is that I think it uses the same crank as the LS1/5.3L - Just needs to be balanced with the assembley.

Wasn't in the Navy, but I like naval history. Did some work on the Iowa Class Battleships when they were moving to museum status. Spent a week on the USS Missouri and New Jersey.

[Steve1968LS2]

The stock bore of an 5.3L is 96.01 mm (3.78 inch) It can easily go to 5.7L which would be 3.89 inch. I know an LS1 block can only go .010 over that. I think the earlier LS1 block (97-00) can only be honed since the sleeves are thinner.

Double check that piston size.. as said 25mm doesn't sound right.

[t72ss402]

Ok, my appology I looked at the pic wrong. It is a .25mm over Speed Pro #L2621F for the GM LS1 motor.

Talking with some other people and they seem to think this would put the cylinder walls to thin. They recommend that because of the cost of the LS1 blocks that I should go with a 6.0. They are easier to get and cheaper.

If this is the case I would have to sell the pistons because the bore is bigger on the 6.0 correct? But would the rods work? They are a scat 6.100 #2-ICR6100-944P.

[junkman]

There are lots of people going to stock ls1 bore on 5.3's, but I havn't really heard of anyone going farther than that. The 5.3,5.7,6.0's will share the same rods.