Ok,
I am getting ready to order some forged pistons from ROSS. I have the measurements and was checking what was as measured vs. the Engine Design utility and there are some variances. Currently I am refreshing the engine with a +1mm overbore. I will be putting it into my 280. Future goals are to run a holset, intercooler, increased fuel delivery, and MegaSquirt. I am building a weekend road car.
I found
my rod lenth 130.530 and the design utility is 130.2 My rods are +.3
My block height is 207.899 and the design utility is 207.85 a difference of +.049
my head CC is 54 instead of 53.6
and my gasket height as measured off the old one is 1.27 not 1.25
I have never ordered pistons before and do not know how much of a variance in my measurements is acceptable.
If it helps I can lay out all the measurements I gathered. Also I used a formula to find piston height above the block (I did not measure before disassembly) and found +.10 which seems to be about average.
The head and block will be surfaced and have checked out to be sound.
Thank you,
Mike