Forged 5.3 Pistons?

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Originally Posted by mitch cobb racing

and isnt a 327 a 5.3 and 350 5.7?

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A 5.3 is actually like a 325 or something and a 5.7 is a 346 I believe.

wait.. I thought the 4.8L shares the same rods as the 5.3L, 5.7L and 6.0L?? The only difference is the crankshaft. The 5.3L, 5.7L and 6.0L have the same type crankshaft.

nope, 4.8 has diff length rods.

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Originally Posted by whitesilvy04

wait.. I thought the 4.8L shares the same rods as the 5.3L, 5.7L and 6.0L?? The only difference is the crankshaft. The 5.3L, 5.7L and 6.0L have the same type crankshaft.

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Assuming that the pin positions in the pistons are the same, 4.8 would need longer rods. Otherwise, the 4.8 piston would be down in the hole by the difference of the two stroke lengths. Now, if you're running 50 psi boost, that may be a good thing. :burnrubb:

Dudes....

Really?

They could have the same rods but if the stroke is different the pin has to be in a different place in the piston. If the pin height was the same it would have to have different rods. Why is this so hard?

ok i know this is old thread but i can't let it go. the pistons on the 5.3 and 4.8 are interchangeable. the long ass rods in the 4.8 are what make up the difference. if you put 4.8 pistons in a 5.3 you get a high compression 5.3l like the new model tahoe's and what not have the high compression higher hp 5.3's.

so if a person wanted to yes they could run 5.7 pistons in a 4.8 after it being bored out but you would have to use stock rods. or get some aftermarkets that are same length as 4.8 rods. my buddy is building a high compression 5.3l using stock 4.8 pistons.

if you call the dealer the piston part number from new model 5.3l to the 4.8's they are the same part number.

if you really want to get silly, you could run a 4.8 crank and rods in a 6.0 and have a 327. well its a touch more cubes than that but it really close to the ole 327's. 4" bore and 3.27" stroke is what you would have.

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Originally Posted by GasGuzzler

Duh. The difference between a 327 and a 350 is the stroke so the pistons DON'T interchange (without a different length rod). If the stroke changes and the rod does not the pin height must move in the piston hence the 4.8 will never use the same pistons as a 5.3 without changing to custom rods which would mess up other geometry.

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the 4.8 and 5.3 are same everything EXCEPT crank, rods, pistons. the 4.8 and 5.3 pistons have the same pin height and you can use the 4.8 pistons on 5.3 rods and raise your compression alittle more if you have room to clear it for your heads. the 5.3 is actually a 325. the old chevys were the 327.

Go away. First post digging up a year old thread arguing with a GM tech. Go away.