http://www.totalseal.com/totalseal3.html

just use OEM rings - rings are installed with a gap to allow for expansion of the ring when they get hot - with proper gap, under operating conditions, the gap closes up to almost nothing - don't believe total seal's numbers about leakdown of 20% with stock rings - i have run lots of racing engines using stock type rings, properly gapped, with leakdown test numbers in the 2% to 3% range - if their's actually were "total seal", wouldn't they have 0% leakdown?