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 approximately 3/10 of a percent with each 1/8" stroke.