My O-rings never fail but I always seem to have a problem with the injector insulators (the really fat O-ring things at the base of the injector where it meets the head), I have always used OEM but also tried others but with the same outcome. Possibly heat? mine seem to dry up and crack quickly after installation, even when using di-electric grease...
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World record holder for Quickest and Fastest 1/4 mile Spyder, 4 cylinder vert, 1st in 10's, 2.0L 4G63 Holset record, Modified Mag December 2010, Self built, self tuned.
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