Piston difference

[snapper67]

Hi guys fairly new here, been checking in on posts frequently to see if there’s anything new. I’m looking at the 31ci pistons and seeing 2 numbers referring to date codes before and after just wondering if someone could tell me the difference between the 2 whether it be thinner or thicker rings, flat top etc etc the numbers are as follows for a 31p677 - 594539 used before date code 14100100
And 594435 used after date code 14093000 so are there any huge differences I should be aware of? Any insight would be greatly appreciated !

[thebandit21]

Both pistons are flat tops, the 594539 looks like a regular piston, the updated piston 594435 is a low friction short skirt piston looks like a race piece. Go with the later piston if possible.

[snapper67]

That’s awesome I appreciate you getting back so quick , low friction and “race ready” sounds good to me! Thanks again!