Greetings!

We are assembling a 85.5/stock stroke 4G63 for the first time.

Our target is 400 BHP with an 8000 rpm redline.

We received our Mahle pistons after nearly 6 weeks...look quite nice with rings/pins.


We checked the gaps on all the rings:


With the results of:


.015 seems a touch tight...

Mahle's instructions talk to turbo with a calculated .020 gap. But the spec seems at the bottom of the page for serious powerplants - which ours is not.

Any experiences/suggestions?

Thanks.