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What is too hot for a flathead to run on a 90 degree day on the highway at about 2500 rpm? My 40 coupe with 53 merc motor runs about 205 after about 20 minutes. I have never let it go hotter than that, I just slow down and it will stay around 190. I run a 5 blade flex fan and 180 thermostats.

I currently have a 4:44 ratio in my standard coupe. I have recently aquired a complete rearend assembly from a 40 Merc with a 3:54 ratio. Was looking to putting in my Ford. Both are coupes. Could this be done? What are the differences? Any help would be appreciated.

Has anyone changed the rearend ring and pinon gears to a diff ratio to lower the RPM at say 60mph. Is this an easy job? or is there an easy swap of the whole rear end to some other, still keeping the banjo style.

I am tuning my 53 flatty up and replaced plugs (gapped @ 30),wires,cap,rotor,points and condenser. set dwell at 28, timing @ 2 deg. Now I set the idle speed @ 450. I got all specs from Van Pelts. This thing is barely running. seems a little slow. Got great vacuum. It has a little hesitation off...

I have found that the 53 flatty came out of a customline and the oilpan runs very close to the steering rods. I think a pan from a truck or a merc that has a rear sump would work better. Does anyone have a source fora pan?