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Old 01-18-2013, 01:36 PM
Mr. P-Body Mr. P-Body is offline
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Yes, rings are EVERYWHERE for the 4" bore. Whoever told you Total Seal was the "only" one, well, NEVER ASK HIM AGAIN! Gapless rings were a good idea, they just didn't "work". That is, while they DO seal the cylinder and generate better "numbers" in a leakage test, they don't make any more power or use less oil (often, more) than "conventional" rings. Gapless rings also tend to taper the cylinder quite rapidly. The Sealed Power E-251K mentioned is a very good ring. If the bores aren't "fresh", though, I'd opt for the E-251X instead (ductile iron). The "K" series are "moly" rings and may have trouble seating in a "used" bore. I haven't seen Perfect Circle available in a LONG time. We use SP as said, Speed Pro (EXCELLENT race ring) and Hastings. We've used Grant in the past with success, as well.

"File fit" rings are among the more used and abused products among DIY engine builders. When building a RACE engine ("custom" specs), one must "fit" everything. Generally, standard clearance (piston-to-wall) is inadequate for racing. As a result, the bore size may increase as much as .005-.006". The "file fit" ring allows you to do this without ending up with too much ring gap. Aside from that, there is no "advantage" to a file-fit ring. We use "drop-in" rings in the majority of our builds.

Jim
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