Tips for avoiding things that can bite you
By John Mummert
In disassembling Y-Block core engines, I have noted a number of common mistakes that are made during the assembly of Y-Blocks during rebuild. Take care to avoid these mistakes.
Block I.D. number generally on side of block above oil filter for blocks cast at Cleveland. Dearborn block I.D. number near distributor and above generator. Most Dearborn blocks used in trucks. No Dearborn blocks after 1957. There were no special truck blocks. Heavy-duty trucks with steel cranks used C1AE or C2AE car blocks.
The Ford Y-Block was introduced in 1954 to replace the well-know flathead. Displacement was unchanged at 239 cu. in., but the new engine had five main bearings, five cam bearings and overhead valves. Bore was 3.500″ and stroke was 3.100″ with 6.324″ connecting rods. Model year 1954 Mercury vehicles had a 256 cu. in. version with 3.625″ bore and 3.100″ stroke. Displacement was increased in 1955 to 272 cu. in. for most Ford car production.