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A few years ago I was using the Speed Pro file fit rings when I freshened the motor I went with gapless rings and saw zero difference. I will stick to the Speed Pro file fit from now on.



He said Zero!
I have built engines week in week out for a LONG time--we dyno lots of engines--we have built some killer circle track stuff over the years at shops I helped at--I have seen for myself and heard many of the best engine builders in the business say that--gapless rings do make beautiful leak down test--BUT..engines don't run like ring test--I was at a shop that did a back to back test--yep! Not long after getting a new dyno they ran it night and day Proving things and DISPROVING much conventional wisdom--
I will stand on this: In what we as Mopar guys do--street/ hot street/ bracket race it is silly to spend over $200 on rings that in our application are NO better than some house brand ( PBM, Liberty, Engine Works etc) rings $70
You guys are fooling yourselves and spending extra cash because you heard or read something--Every magazine article I have ever had anything to do helping out the writers -- was done for reading and entertainment NOT for facts. Do you believe Street Outlaws is real?
Save your cash --Gapless rings are handy when you run and eat dirt--they keep making cylinder pressure a little better after it has been eating dirt and worn itself out--run them in an alky injected where at idle it is usually very rich and can get past rings to screw up your expensive oil but there is no good reason to run them in a plain old bracket or street Mopar--



THIS ^^^