Engine piston T-Slot

LeeBo · Post by **LeeBo** » Fri Jul 11, 2008 6:18 pm

Hello ! This is a "motor-head" question ! Can anyone enlighten me as to the purpose of the T-slot which is on the camshaft side of a Willys standard type cast aluminum piston ? I am currently installing a set of NOS Federal-Mogul forged pistons and these do not have the T-slot on them.

Post by **wesk** » Sat Jul 12, 2008 1:26 am

They were there to help with piston expansion from the heat.

LeeBo · Post by **LeeBo** » Sat Jul 12, 2008 5:47 am

Thanks Wes ! The forged pistons do not have the T-slot. Is this because they are much stronger and so do not need the slot for expansion ?

Post by **wesk** » Sat Jul 12, 2008 10:44 am

Yes I believe the stock piston expansion rate is higher than the new replacements.