Check my forged piston numbers

[datz280]

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