Quote:
Originally Posted by BobBray
Yes, later 305E's used 3 ring pistons. Most V-6's have 4 rings (3 compression, 1 oil ring set).
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I think that pertains to the 351E, some early versions came with 4 piston rings and later switched to the 3 ring. After 1969 when the 305E was discontinued in light duty trucks, GMC replacement pistons for the 305E were superseded to 4 ring pistons for standardization purposes. I'm sure they did the same for the 351E as well. Piston sets that I bought for both 305 and 351 engines have all been 4 ring type.