I'm looking into building up a 408 CID stroker from my LQ4 6.0 engine in my 2000 K2500 Yukon XL with the 4L80E. The stroker cranks (as well as the newer factory cranks with the 3.622' stroke) all have the thinner rear flange as compared to my current crank. If I install the 12563532 Spacer and the 12563533 Bolts between the rear crank flange and the flexplate, do I need to do anything else to mate up again with my 4L80E?

Thanks,

Steve

 

TTT,
Any thoughts on this? I see some folks have read it.

Thanks,

Steve

 

You'll need the spacer and longer bolts to extend the rear crank flange to make your stock flywheel line up with your 4L80E transmission.