The Go-Devil was a cast iron L-head, also known as flathead or valves-in-block. It used only three main bearings, but often had a forged crankshaft. It was undersquare, meaning the stroke dimension was greater than the bore (by more than two inches in this case). This was typical for the era and resulted in slow-revving engines with a lot of torque down low. Breathing was the weakest link due to the intake and exhaust valves being in the block. Our sister magazine, Hot Rod, hopped one up in 1953 with a 7.75:1 compression ratio, ported intake and exhaust, dual single-barrel carburetors, and a hot cam. The January ’53 article didn’t list the output, but similarly-built engines could make nearly 90 hp at a bit over 5000 rpm.