12V marine 370 pistons machining for valve reliefs

Have somebody ever machined Cummins 12V marine 370 coated pistons for valve reliefs.

The normal non-coated marine piston have 14mm ring landing and some have 0.150 machine reliefs, but the coated piston have 10mm ring landing if I machine the same reliefs (0.150) will they be to close to piston rings.

Here is picture of my piston.





just for comarison


non coated marine piston:


and new Mahle machined marine style piston

Well there should still be approximately 6mm left to the ring land if you cut .150 reliefs, I can't see that being an issue.

It interestiin, marine 370 piston use the longer piston pin.

The same pin what is installed to CR engine pistion.

Here is side by side , left CR pin and right regular 12 piston pin



I am still looking input about valve reliefs in piston

My mahle are cut .250 so u won't have any trouble I got about 20 pulls on Them

Rich dzl said:

My mahle are cut .250 so u won't have any trouble I got about 20 pulls on Them

Click to expand...

You had coated with 10mm ring landing pistons?

nice pics