Ford 351C Cleveland Exhaust Valve Guide (3061) The Speedmaster blocks are cast

The Speedmaster blocks are cast from high-density iron with extra-thick cylinder walls and decks

flush-machined set screws for proper contact on the studs

ensuring a perfect fit and maximum efficiency

but both factors can be equally important in a race car

These extreme main cap sets consist of the center three caps

Ford 351C Cleveland Exhaust Valve Guide (3061) The Speedmaster blocks are castSpeedmaster valve guides are constructed from high quality bronze for durability and wear, and built to exacting tolerances, they replace your existing worn or damaged valve guides. These guides are offered in a variety of diameters to suit your application..