Here is another comparison for you. This is a post by site member "Charlie Cheap said", "for my 65 Mustang. The OEM 200 had to be bored .060" over to clean up...which is not a good idea. I drove it to Tennessee last summer for the M6A show, running 75 and sometimes better just to stay with traffic. It had no problems running up to and above those speeds. After the M6A show we went to Mississippi to visit relatives. It ran great, got 24.5 MPG running the AC all the way, but refused to start after stopped, unless we allowed it to cool. Mine is built for highway running not max power. I will remove the internal goodies to put on this motor as I am well pleased with its performance. Anyone else needed a .060" bore and finding the same problem? It works but has issues with cylinder-wall flex when hot. Hoping a .030" bore will clean up cylinders but have a question. My 65 has 8.8 - 1 compression with 13cc dish pistons. The 73 looks like it has a lower compression when checking info pages. Is this true? Are the 6.5cc pistons the way to go? About 9-1 or 8.5-1 seems like a good road static-compression for a car not racing. With my cam that comes to just below 8-1 dynamic-compression. My dizzy is one I built with BWD SELECT parts and Pertronix conversion with a dual-advance (swing-weights-vacuum) modified with the 925D spring, manifold vacuum and Ford 9mm wire wound plug wires feeding Autolite AP46 plugs gaped at .040". A MSD .8 ohm ignition resistor puts a little more primary voltage to the ACCEL 42,000 volts coil, while the lowest ohms wires reduce that voltage as little as possible. With higher input the coil puts a little more to the plugs plus it has about 10K higher ability than the OEM. Better coil, more primary volts, Pertronix, the best available parts, tuned right, and platinum plugs...works." [image]img1743[/image]
These Falcon Six engines were well know for getting great MPG back in the day (Mobil Economy Run). So there you go mid 20's without much effort and I am sure if you worked at the combo's tune you could get much higher yet to around 27 MPG or so. Good luck