Never over 225 and when it hit that was shut down... added fans and now never over 200. Timing at 20. Edelbrock heads. AF unknown. No smoking..... Runs smooth. Just not a screamer.
1966 Fairlane With 502
Installed a ATK 502 525 HP engine in the Fairlane. Had some over heating problems at 1st......fixed that with 2 elec fans and water pump fan.......... Now seems not to be producing 525 HP. Should be a screamer but not living up to ATKs HP claim ?
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ATK recommends 30 to 34 initial timing.Whoa!Initial (base idle) timing is 30°? That's dangerous, as it will add unknown timing as it revs.
As you do not know the centrifugal advance in your distributor, you can set timing by total (all-in) advance at high-rpm. Disconnect and plug the carb-side of your vacuum advance (if you have it). While watching the timing with the timing light, rev the engine until the timing advance stops adding timing. Note the degrees. Adjust the distributor position until the total timing (all-in) when revving to all-in is 34°.
If it were me, I would confirm exact timing mark location with a $10 spark plug thread timing stop (or make your own). Then if you do not have a dial-back timing light; add measured marks every 5° to 40°, before setting timing as-above. 34° is only a place to begin timing tuning, but should be much closer than guessing, and certainly safer than what it is.
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