design evolution · FF-0091

Why did Ford change the Flathead V8 from 21 studs to 24 studs?

The 21-stud layout put a stud close to each cylinder bore, limiting bore enlargement while retaining enough head-gasket fire-ring area. The 24-stud layout created more room for a larger bore and more displacement.

Expert

Steve Coppock

Evidence

expert attributed

Component

cylinder block, cylinder-head studs, and head gasket

Applicable scope

1938 and later 24-stud Ford Flathead V8 compared with the earlier 21-stud design