Edelbrock Cylinder Heads 1939-48 Model Ford Flatheads w/ Block Letter Logo (Pair)The Edelbrock #1126 Ford Flatheads feature a block logo design for Fords and Mercurys, and are cast at the Edelbrock Foundry in the USA of T 6 tempered A356 aluminum. The Edelbrock #1126 heads are rugged, ribbed internally and externally, with a large water capacity and excellent breathing characteristics. The 65cc heads support 8. 0: 1 compression ratio on blocks with a 3 16" base relief (stock bore and stroke), compression ratio increase is