3.8 vs 4.1 piston weights

[79bird]

Looking to find the weight difference. I'd like to put a T5 behind my 4.1 but can't find much info. Any help? Thanks

 

[earlbrown]

I made this long before I made my forged slugs for 4.1's/3.8's.. so they all read a little heavy, but it was accurate back then...