Probe piston wall clearance.

[Dragonbat13]

Does anybody know how much clearance Probe puts into its SRS pistons. Specifically part number 12351? I measured my bores in my block with a dial bore gauge, and came out with 4.0442 on the top of the thrust side of cyl 6 and 4.0438 at the same place on Cyl 8.

All the other cylinders are showing 4.0430 or less. Taper is under .0008 for all cylinders except for 3 (.0009), 6 (.0011) and 8 (.0018

Is there enough meat to use the probe pistons with the wall gap on the high side?

 

[80fbody]

You can check their site for suggested gap. That's about what they should be undersized. Forged depends on the material. 4032 expands less and will probably only have 1.5-3 thou built in the piston. 2618 expands more so 3.5-4.5 thou would be a good estimate there, imo.

2618 pistons are a stronger piston from what I've read. You can call Probe Tech dept and ask them for the skirt dim for that specific piston.

 

[Dragonbat13]

Ill give probe a call monday morning. From what I could find they give a range of .003 to .007 on those pistons. I was just wondering where probe sets the clearance on the range above.

I must mention that the above numbers are diameters. First time using a bore gauge also. I should have mentioned that above.