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My speedometer is off and has been reading low since I've owned it... It has the factory 2:76 rear ratio... it reads about 5 mph off between 35-55 mph. Then once your traveling 60-80 mph its starts to vary around 7-8 mph off. Example : When the speedo says 60 your only traveling about 54-55...

What is everyone running in their 440's instead of the j11y champions that are obsolete ? J12YC ? Looking for the same heat range or one step hotter . I tried auto lites but their too cold of a plug for initial start up

Where can I find the correct idler pulley for a 1974 Imperial , factory installed AC. All the ones I've tried from napa, oreilly's, etc are all to narrow for the double V belt system