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Old 12-15-2022, 11:48 PM   #10
1971 GMC SHORTY
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Join Date: Apr 2009
Location: SAN FERNANDO VALLE SOL CAL
Posts: 1,064
Re: 1966 GMC. I fixed it...but still don't know what I fixed?

Need To put Complete Exhaust System To Have Correct Back Presser mine did Same Thing, when I Put A 500 CFM Holly Incredible Power Next I need to Install The Hei I Just Made Bushing for distributor
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1966 GMC K25 V6 351E Original Utility Truck
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