Crank end play, destroyed converter, 408 nightmare

Hi, sorry for your loss.

Main Studs normally are tightened with more torque than stock bolts. Higher torque will distort the bore differently, so the mains should be honed after installing the mains and tightening with the desired torque.

Regarding the head Gasket: to me it seems that not all the bolts were tightened, seen this sometimes.

I also would change over to another piston....afaik Scat has got a kit with 20,5cc forged Pistons.

Michael