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
2000 C3500 Hot Rod Utility Truck
2003 ROAD KING 100th 124ci 6 Speed
145CI M/P Pro Street FXR
2002 FXDP
2007 2500HD DURAMAX. DD
Studio Teamsters / Mechanic
Retired GM Master Tech 20 Years
Retired Ford Tech 15 Years
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