Hi Again, I am getting ready to put a used 400 motor back together that I broke down to inspect and reseal.

My question is weather to lightly scuff the cyl. walls and the rings, or to just leave them alone. If so what grit should be used.

The rings are well seated and show no signs of glazing or cracking. Also there is no scoring or ridge to speak of on this .30 over motor. Pistons skirts are nice too

Any advise would be greatly appreciated

Old 4x4

 

Unless you are going to put new rings in just leave it like it is.

 

Nope, rings are fine. Thanks for the advise.

 

i used an oiled 3M kitchen sink scrubby pad to deglaze and remove the 'frost rust' on my last head gasket job. i just installed a fresh cross-hatch pattern with each piston at the bottom, then crank or turn the engine over a couple times and wipe the cylinder out with a rag. spray a little clean lube in the hole and repeat. it runs like a champ but the kid used the car to stop oncoming traffic to make a left turn... he needs to work on that move.