bore size for 1st over stock m20 2.5

[rvaughnp]

Can someone enlighten me on this.
Need it to send to Ross for custom piston build.
Thanks,
rvaughnp

[reelizmpro]

Shouldn't they know where to find that information? I'm sure it's in the Mahle book. Should be 84.15mm or something like that. Don't quote me though.

[lennon]

common first overbore is .25 mm, so 84.25mm piston.

edit- they definitely have that info though.

[rvaughnp]

Thanks for the replies.
Ross simply told me to gather all needed info and fill their request form and wait for reply.
I found the info in Chiltons, from the library. Amazing how much information can be found in one building... who knew?

2.5 piston info:
Standard size 3.306in. 83.98mm
Intermediate 3.309in. 84.06mm
1st over 3.316in. 84.23mm
2nd over 3.326in. 84.48mm

Piston clearance (I believe this is side clearance, these do not calculate if used for wear.)
New .0004-.0016in .01-.-04mm
Old .005in .12mm

Cylinder info:
Standard size 3.3071-3.3075in 84.00-84.01mm
Intermediate 3.3102-3.3106in 84.08-84.09mm
1st over 3.3169-3.3173in 84.25-84.26mm
2nd over 3.3267-3.3271in 84.50-84.51mm

Out of round 0.0012in 0.03mm

rvaughnp