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R/MR (Alpha One Gen I 1983-1990)
Specifics: 13 3/4" x 21P
Appears it was white
Appears to eventually been replaced by 841963
277000273 Choke Plate 291000457
MerCruiser 140hp 3.0L .060" Oversize Pistons 4cyl 1491H-060 Silv-O-Lite 1972-89 Crankshaft R/MR (Alpha One Gen I*****Missing one of the piston rings, but it might be wise to just contact Silv o lite and just get new rings for all of them.***** Part Number(s) Included Silv O Lite Cast Dish Pistons 1491H 060 (0. 060" Oversize) Piston & Pin Assembly (Set of 4 As Pictured) THESE ARE 0. 060" OVERSIZE PISTONS You can get all of the information in Silv O Lite's catalog (Page 87) Connecting Rods (also included as pictured) and I'd imagine they are still the OEM GM ones