Lokar Flexible Engine Dipstick 4.6 Modular is a Billet aluminum and stainless Dipstick for the pre-1980 Small Block Chevy. The application is straight into the engine block - no upper tube necessary. The dipstick seals at bottom of the handle with double O-rings. The Billet aluminum handle has been designed to coordinate with the Lokar Flexible Transmission Dipstick.