Chevy BBC 454 360cc 115cc Aluminum Bare Cylinder Head Speedmaster valve locks are designed

Speedmaster valve locks are designed for stock or performance engines using 7 degree valve locks

They are manufactured from brass and include thread-in brass jet extensions (where noted)

Speedmaster Keychains are the perfect way to let everyone know where you go for high performance aftermarket parts and accessories

They work under the same principals as OEM tanks

Chevy BBC 454 360cc 115cc Aluminum Bare Cylinder Head Speedmaster valve locks are designedAs with all Speedmaster cylinder heads, our Big Block Chevrolet heads are "Gravity Die Cast". This casting process creates a much more uniform and robust cylinder head. With the increasingly large displacements becoming common, the need for more airflow is necessary. If you are looking to build a 400 500+hp engine, give our PCE281. 1489 heads a try. They offer a smaller cross section to increase the incoming air"s velocity, resulting in great