Is there a reason why (crank clearance?) you can not use a 6 inch rod with a 1.425 CH piston? in a 2002 LQ4. Basically its a rod and piston combo for a genII 383

Thanks

 

other than the fact your piston would be over .060 inch out of the hole, no.

also depends on what crank you use.

my calculations are based on a 3.75 crank for the 383 and a 4 inch crank for the 6.0...

 

and i dont see how that would work on an older 350 block because the piston would be over 1/4 out of the hole...something's not adding up here.

 

Well I believe the rods "offset" measurments are different from gen 1 & 2 to gen 3 & 4 but more importantly The stock LS1 rod length is 6.098" and CH is 1.326" so add 6.098 and 1.326 and 1/2 of the stroke 3.622 or 1.811" so 1.811 plus 1.326 plus 6.098 and You should be right at 9.24" so a longer rod and a piston with larger than 1.326 would mean the piston would come out of the hole about .125 " or whatever ,,,,,I don't remember the CH of the piston You mentioned but it was 1.4xx something .

 

This is what I came up with
.5 x 3.622 = 1.811 + 6 = 7.811 + 1.425 = 9.236



.5 x stroke + rod Length + comp hgt = piston deck height

with a stock deck height of 9.240 and everything else being perfect I figured i'd be .004 down

Did I figure correct?

What are you referring to with "rod offset"

 

Yes that could possibly work with a 6" rod ,,,,,,,,I thought You said the rods You had thinkin of using were 6.2 or something like that .

 

Offset is on the side to side plane inline with the crank from front to back the center of the pistons are'nt on the center line of the rods ,,,,,,they are just a little bit off center ,,,,,,,,not enough that's noticeable when looking at them with You're eyes ,,,,,,,,,,You can kinda see it if You compare the side of the rod that's rounded to the side that's squared off on the GM rods .

 

I guess I was under the impression that they had the same bore centers so I figured the rods would line up properly