Chevy BBC 454 Rear Seal Adpater Gen V &VI Block 1PC to 2PC Rear Main Seal Tune your rpm-activated control to

Tune your rpm-activated control to your application with one of these Speedmaster rpm module kits

easily outperforming stock ignitions

you'll want Speedmaster NPT-to-smooth hose adapters to give the installation that final

The Speedmaster universal 21 circuit harness can be used in any vehicle application

Their performance

Chevy BBC 454 Rear Seal Adpater Gen V &VI Block 1PC to 2PC Rear Main Seal Tune your rpm-activated control toThese Speedmaster rear main seal adapter kits are designed to install an early 2 piece style crankshaft into a late model, 1 piece engine block. They are manufactured from billet aluminum and require no drilling or welding for installation.