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5.3 to 5.7 compatibility and pistons questions

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Old 08-03-2015, 10:42 PM
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Default 5.3 to 5.7 compatibility and pistons questions

Hey guys, I have a 5.3 short block that I want to bore out to 5.7 specs. Will my forged ls1 crank and rods transfer over? Also what forged pistons you would recommend?

Im unsure of the "dish" and all the other parameters that matter for buying a piston set. I have port and polished 853 heads (milled .004's off); not sure what other components you need to know. Looking for 800whp until upgrade my fuel system more, then 1000whp.

$150 to bore out the motor and $250 to balance the rotating assembly, decent price?
Old 08-04-2015, 06:38 AM
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Any point in over-boring the engine?

The best thing about the 5.3 block is that there is enough meat between the cylinders to make the block incredibly strong. As soon as you over-bore it, you thin out the cylinders. I would stroke a 5.3 long before I would bore it.

Yes, your 5.7 crank and rods will work.
Old 08-04-2015, 10:11 AM
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Default 5.3 to 5.7 compatibility and pistons questions

Yes, bore it and everything else will fall right in. That's what I did. Making over 1000 hp to the wheels
Old 08-04-2015, 11:25 AM
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Originally Posted by JoeNova
Any point in over-boring the engine?

The best thing about the 5.3 block is that there is enough meat between the cylinders to make the block incredibly strong. As soon as you over-bore it, you thin out the cylinders. I would stroke a 5.3 long before I would bore it.

Yes, your 5.7 crank and rods will work.
Does the added displacement outweigh the benefit of the thick walls?

Originally Posted by THADD
Yes, bore it and everything else will fall right in. That's what I did. Making over 1000 hp to the wheels
What pistons did you go with?
Old 08-04-2015, 01:15 PM
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I went with diamond pistons in my 5.3 bored to a 5.7
Old 08-04-2015, 03:46 PM
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Originally Posted by SCott5
I went with diamond pistons in my 5.3 bored to a 5.7
Any sponsors or sites you would recommend to buy from? What about the "dish" of the piston and stuff. What compression ratio are you at?
Old 08-04-2015, 05:43 PM
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My pistons are at a -2cc dish and with my 317s and everything calculated I'm at about 9.6 cr.

As far as sponsors go I try to stay local to me which there are a few local places to me that sponsor this site so I usually go to them.



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