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I use a C/A ZGF top ring and a Total Seal second ring on the race car.....both are plasma moly...
I cheated a bit since my piston has a 1/16" top and second ring groove...
IMO, if the shop isn't familiar with the surface deformation required to seat these rings, either don't use the shop or don't use the rings...
There is a specific stone set and a specific pressure and dwell required on the CK10 to finish the wall surface to seat these rings...I leave these settings to the gentleman who does the machining on my blocks...he does most of the racing engines in our area...
I recommend plasma moly rings if you can get the cylinder walls prepared correctly....
There's nothing wrong with plain cast rings on a stock rebuilt engine...personally, I've always avoided chrome rings because sometimes they never seat....
Tell me a little more about the rest of the combination and the prospective use...
Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg
I cheated a bit since my piston has a 1/16" top and second ring groove...
IMO, if the shop isn't familiar with the surface deformation required to seat these rings, either don't use the shop or don't use the rings...
There is a specific stone set and a specific pressure and dwell required on the CK10 to finish the wall surface to seat these rings...I leave these settings to the gentleman who does the machining on my blocks...he does most of the racing engines in our area...
I recommend plasma moly rings if you can get the cylinder walls prepared correctly....
There's nothing wrong with plain cast rings on a stock rebuilt engine...personally, I've always avoided chrome rings because sometimes they never seat....
Tell me a little more about the rest of the combination and the prospective use...
Pat
http://albums.photopoint.com/j/View?u=1570936&a=11937754&p=42910787.jpg