was this pulley a double groove 1/2" wide deep groove pulley or a single groove 1/2" wide pulley. i realize the idler assembly, in spite of being in the AIM, peobably didn't see usage till the 63 model year. could the double groove deep 1/2 pulley been used in 1962 solid lifter applications in spite of no need for the second groove? thanks,mike
62 340 and 360 hp harmon bal Pulley
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