Pinging on acceleration.
If its a mystory distributor, then the timing curve is a mystery too and you'll have to do some testing and measuring.
Its not the engine that caused the 750 idle rpm, its the emissions control setups used from the late 60s to mid 70s.
Then when cats came in they were able to split the difference to some extent.
Basically non-smog timing for '66 fell into this spec when set at 5*BTDC
And for comparison the '73 225 automatic with its original distribitor advance specs
Pinging is usually noticed up in the driving rpm range.
Setting a distributor with an advance curve like the '73 to the '67 initial of 5 * BTC could put the engine timing at 27 degrees at 2000 rpm. And if it pinged, that would be the cuase. The advance curve and the initial are tied together in terms of what the timing is at a given rpm. If we don't know the distributor, then we don't know the advance and initial becomes guess work resolved by measuring and testing.
If its a mystory distributor, then the timing curve is a mystery too and you'll have to do some testing and measuring.
Its not the engine that caused the 750 idle rpm, its the emissions control setups used from the late 60s to mid 70s.
Then when cats came in they were able to split the difference to some extent.
Basically non-smog timing for '66 fell into this spec when set at 5*BTDC
And for comparison the '73 225 automatic with its original distribitor advance specs
Pinging is usually noticed up in the driving rpm range.
Setting a distributor with an advance curve like the '73 to the '67 initial of 5 * BTC could put the engine timing at 27 degrees at 2000 rpm. And if it pinged, that would be the cuase. The advance curve and the initial are tied together in terms of what the timing is at a given rpm. If we don't know the distributor, then we don't know the advance and initial becomes guess work resolved by measuring and testing.