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#11
11-30-2009, 06:08 PM
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One relatively simple way to tell the difference between a "standard" 455 piston and an SD is to check the skirt by the pin bosses and the width between pin bosses. The standard skirt is flat across the pin boss opening when viewed from underneath, the SD has a slightly hourglass shape to it. gap between the bosses is 1.5 for a standard for cast rods and 1.275 for an SD/forged rods. TRW's number for the single trough SD .030 was L 2423. Have both styles on my desk. the SDs will also have the snap ring groove.
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