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Lead has been present in gasoline pretty much from the beginning. The common thought is Ford decided to get cheap and stop installing hardened seats when they invented the rotating valve assembly, which helped keep the valves from pounding in the same place and taking a set.
I think you nailed it. Looks like my motor is a 1951 EAB motor with non rotating valves. I feel confident now with the springs I need. Thank you, thank you
I checked the lift on my valves and I only had .180-.210 lifts. Fuel pump rod lift was .120. What cams will work? I have found a 7RT-6250 and an EAB-6250. What's the difference? Thanks
There are many flathead cams with slight differences in the grind - I don't know exactly what those differences are. There is a technical reference here:
The 7RT-6250 is not a part I find in any of my Ford documentation. It again seems a culprit of a vendor, such as DC, using a Ford looking part number for some of their items. The EAB-6250 was used in 52 and 53.
Any of last generation cams can be utilized with all the appropriate accompanying components.
Our tucks 239 engines were furnished with 7RA-6250-B, 8BA-6250-A, 8BA-6250-B, and EAB-6250-A.
There are likely markings on your existing cam that can help identify it once uncovered.
I got my cam out today. It was marked EA with the letter A under it. The crank was also marked EA. The rid journal were 2.139 - .020 not 2 ". I assume I can get new bearings for this crank.
Last edited by Goshencars; Jan 24, 2026 at 06:41 PM.
I got the cam out and it looks good. I measured the diameter of the heel and heel to nose and hade over .300 lift. I am not sure why I got lower lift readings off the valves when in the block. I attached pics
