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68gmsee · 08-11-2017, 12:31 PM

Engine is a 350 bored .030 over and is for an occasional driver/street use.

Ordered a set of sealed power hypereutectic cast pistons from local auto parts. Came as a set with wrist pins and rings and had to return the set.

Reason for return:

Pistons fit fairly decent with a tight .002 feeler guage on one side of the skirt. Measuring piston vs skirt width with two digital micrometers showed a .0015 difference which was withing specs. However, the rings showed a wide gap of .040 +/- .005 on several cylinders.

In the past most rings I've bought have had to be filed slightly to gap them correctly so I figured they had sent the rings for a standard 4.00" bore. The .040 ring gap would have been about .010 in a stock block.

08-11-2017, 12:31 PM	#12
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Sealed Power Pistons? Engine is a 350 bored .030 over and is for an occasional driver/street use. Ordered a set of sealed power hypereutectic cast pistons from local auto parts. Came as a set with wrist pins and rings and had to return the set. Reason for return: Pistons fit fairly decent with a tight .002 feeler guage on one side of the skirt. Measuring piston vs skirt width with two digital micrometers showed a .0015 difference which was withing specs. However, the rings showed a wide gap of .040 +/- .005 on several cylinders. In the past most rings I've bought have had to be filed slightly to gap them correctly so I figured they had sent the rings for a standard 4.00" bore. The .040 ring gap would have been about .010 in a stock block. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...