Been looking at parts for my motor i found this Mahle forged pistons and ring set here are the details

LS1/LS6 Chevy PowerPak Piston Kit
Forged 4032 High Silicone Aluminum Alloy
Bore: 3.898''
Pin Diameter: .945''
-1cc Dome Volume
Compression Ratio @ 64cc: 10.7:1
Precision Ring Grooves for Included 1/16'', 1/16'', 3/16'' Rings

Stroke: 3.622
Rod Length: 6.622
Compression Height: 1.314
Weight: 398g

I plan on running 243 heads....just trying to figure out if these are the correct ones...any help would be greatly appreciated!

 

That rod length is not correct. Stock rod length would be 6.098" on all but the 4.8L and 7.0L engines. It looks to be that the .622 from the stroke got transposed to where the .098 should be.

Do you want your compression to be at 10.7:1?

 

I was trying to find the stock rod length spec.....thanks for claryfying that!

Yea im wanting the compression around 10:5:1

 

Is there something wrong with the motor you bought or are you just improving it? There are the stock rod lengths..

 

I am intrested as well, I am doing the same swap for my 92.

 

Its pretty gummed up nothing was broke just the people didnt maintain it.....so im just gonna go ahead rebuild it

 

how much boring is done to get to a 5.7 on a 5.3 block? How thin will the block be? And is it safe for everyday use?

 

Look around the forums for "5.3 to 5.7" or similarly named threads. Your question has been covered a few times and the machine work has been done. Simple answer, you're going from a 96mm 5.3 bore to a 99mm 5.7 bore and then just use LS1/LS6 pistons.

 

From the above graph posted it's simple subtraction. (3.898-3.779) = .119 inches difference in bore diameter.

 

yea I kinda fiqured that but I guess the question should have been re worded. I have only had sbc bored out and I was always told to keep it at .060 or less and on this block it will be .119 so I was really asking how safe is this for an everyday driver?