My '65 Formula S Data Sheet

dibbons said

OK thanks, I'll update the liters to 4.5L

After "red engine paint" above I did note dual breaker points already. However, not sure if that changes the dwell angle of 28-33. Or for that matter, how would one use a dwell meter on a dual point distributor anyway?

My gas mileage on the 1,000 mile trip from San Diego to La Paz (here) was terrible. However, I found when I arrived the distributor vacuum advance was defective. Then again, on the same trip the factory AFB was feeding a 318 block a previous owner had swapped in but still retaining the top end of the 273.

Click to expand...

Mileage on my 65 dart 4bbl 273 4spd with 293 gears was 23-25 consistently for many, many years before the rebuild (1975-2004). Even after the rebuild with a slightly larger lift /duration cam with 323s in an 8-3/4 it gets 18-20 mpg. Premium 91 octane.

318 would be a bit different from a stock hipo 273,. ..... , higher rotating mass, and more depending on what previous owner meant by retaining the 273 top end. If you have a 318 it is a 5.2 as you said, not a 4.5L. Should change the Cubic itches in your sheet

Dual pont tuning, Set each side separately 27° to 31°. A paper match or small piece of shoe box can be used to block one side off , combined dwell should be 36° to 40°.