Home First Gen Mustang 1973 Ford Mustang 1973 Ford Mustang Tune-up Information Year Engine Spark Plugs Distributor Timingº IntakeValve opens Fuel pump press Idle speed Cyl cid HP Type Gap Dwell Gap Man A/T Man A/t 1973 6-250 99 BRF-82 .034 37 .027/25 6B 6B 16 4.5-6.5 750/500 600/500 8-302 140 BRF-42 .034 28 .017 6B 6B 16 5.5-6.5 800/500 575 8-351C 165 BRF-42 .034 28 .017 – 6B 12 5.5-6.5 – 575 8-351CJ 266 ARF-42 .034 28 .017 16B 16B 14 5.5-6.5 1000/500 800/500 No Subscription? You’re missing out Get immediate ad-free access to all our premium content. Get Started Already a Member? Sign in to your account here.