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What was the actual hp when new... many engines was down rated in that era!

I did the 10L slot initial 12 no pinging anymore stock advance springs. Now on to a afr gauge to fine tune my 670 quickfuel Thanks everyone

Why is it nessesary to change the factory springs location? Its already in the 13l slot so the only thing i was planning to is to make it smaller to 10L and assemble it again

What springs should i get fir the distributor? Keep original! I only have the 13L slot so i think i will weld and grind until i have 410”

Its a bone stock car checked the adavnce slot today its at the 13L position wich produce 26* Advanced timing initial 12 = 38 total If i lower it to 10 initial it should produce total 36 wich should be perfect for a 351C but it still pings/knocks!!! I have the factory double diagram...

On my stock 351C 4V closed chamber M-code engine 4- speed manuel 21 in hg at idle I run 95 unleaded fuel Stock dual vacuum diagram distrubutor only hooked up to the advance to portet vacuum on  Carb metering plate/timed vacuum Idle is 1000 cant go below since timing is so high initial If i...