Ron Ron Ron... need help with the 450?
It's D-Jetronic. Valve specs are listed on the hood ID tag I believe, but they should be 0.004" (.010mm) intake and 0.008" (.020mm) exhaust when cold.
My 4.5 pre-head upgrade pinged on less than 92. Now I ping slightly on 93, but I never used less than 93. Some people get by fine on 87, but I kept my timing a little more advanced for power and liked running premium to ease my mind. If your temps on the highway cruises ever go above 175 on pure 87, no matter how fast you cruise at (eg: 120MPH for 2 hrs nonstop), then try 89 then 93...
Measure your chain stretch. Replace the rails first if they're plastic and stretch reads >8° on the right cam. If it still reads >8° then replace the chain. It sucks to hear your rails were replaced - early 4.5 had the much more preferable aluminum-backed rails that didn't crack. Mine does.
Any misc 4.5 parts you need?
