Join Date: Aug 1998
Location: Waldorf Md. USA
Keith Black pistons are the only ones that require a larger top ring gap due to thier design !!!! All of the other hypereutectic pistons use normal ring gaps. This includes all of the Sealed Power, Ohio, Badger, Speed Pro, Federal Mogul and all the OEM hypereutectic pistons. If you use the big ring gap on those pistons, you will have some blowby. I quote from the page xiv of the 2000 Sealed Power piston catalog ..."our hypereutectic pistons operate perfectly with standard ring end gaps, and have conventional ring land locations" I think you will find the same is true with all the others exept the KB's. If you do not believe me, call the piston manufacturer and ask them, which you should do if there is any doubt anyway.
Let me know which pistons you are using and I will find out for you for certain. There should be a part number on them.
Advanced Automotive Machine
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 ..one family car...Brother bought it new in 73
[This message has been edited by BillK (edited 04-07-2001).]