Chevy BBC 454 Rear Seal Adpater Gen V &VI Block 1PC to 2PC Rear Main Seal All the factory flaws redesigned

All the factory flaws redesigned to be eliminated

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

you will need one of these tach adapters

you'll need to look at every area of the transmission to boost your performance

resistance and turns ratios to deliver10-15% more energy than the OEM coils

Chevy BBC 454 Rear Seal Adpater Gen V &VI Block 1PC to 2PC Rear Main Seal All the factory flaws redesignedThese 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.