Huicho417
Well-Known Member
Car is a 1967 Coronet 440 with 318, automatic 727 Torqueflite. I have been having a lot of fun with it after chasing a rear main seal leak and bad distributor gasket/clamp. I have upgraded the engine with hooker headers, flow master dual exhaust, Edelbrock intake and four barrel carb. The distributor has also been converted to electronic and switched to a double roller timing change. When I get on the highway I get the feeling that it just lacks power when pushing past 60. It will do it, just felt forced. After reading several articles on timing I decided on tuning this to see if it makes any changes. When I checked it this weekend with my timing light showed 11 btdc, I cannot recall why I tuned it to this. Possibly because the service manual suggest 10, but for the stock engine. Which it no longer is. I changed it to 15 btdc and noticed a very positive change when I drove it this morning. It accelerated much quicker from light to light and it seemed to get up to 75 with little effort.
Question is: How much more timing should I add and what can I look for before it starts having a bad effect on the engine? One article I read mentioned you can add until you start hearing pinging from the engine. Which in their case was to about 18 btdc. TIA.
Question is: How much more timing should I add and what can I look for before it starts having a bad effect on the engine? One article I read mentioned you can add until you start hearing pinging from the engine. Which in their case was to about 18 btdc. TIA.