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Not sure why some have dual belts... I pulled one off a six cylinder truck with no real options... It just went bad yesterday so I had to swap it out with another, but I went with a single pulley type alternator.
Might be for that california smog emission air pump or something like that.
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Senior active founding member.
70 3/4 ton GMC Suburban 4x4 250/4 spd.
71 1/2 ton Suburban Chevy 4x4, 350/350
72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane
2005 FLSTSCI Harley Springer
85 FXSB Harley Lowrider
72 Triumph 650 Bonneville 5spd
"Poor people don't have hobbies" Quote from wife.
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