Timing Curve on 360 in an RV

mbaird said

I am not home right now but I have the FSM for 78 Motorhomes and they do have 2 stage advances . Plus the vacuum advance.
My question about emmissions was because I wasnt sure if heavy vehicles fell under the laws at that time . I remember 3/4 and 1 ton trucks still ran leaded fuel into the 80s.

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They were catalytic exempt. I can recall being told this in a Ford dealership back in '76. I asked why the F150.... before that, they jumped from F100 to F200, and the 'new' F150 gave them the chance to make a high enough weight rating in a 1/2 ton chassis to not put in the catalytic converter. Sorta a 5/8 ton rating, I guess LOL