Zero Gap Rings
 

Does anyone have any info or experience on any brand of zero gap or gapless rings? i.e. How much improvement etc. Problems or issues with them. The best thing since sliced bread etc.

Neither of them are really necessary or preferred for a street performance motor.A good moly ring set in + .005 for file fitting is still the way to go in my opinion.Watch that top ring gap with K/B Pistons.They require a different gap than conventional pistons.

yep ZGR rings from C&A or total seal rings aren't needed for the street, actually might even be a bad idea on a street engine. if you want to maxamize the sealing power of the rings file fit them and go for the minimum ring end gap.

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ICON Motorsports
1st & 3rd
MM Black Diamond 538 F&AM