Efficient Oil Pump Priming: Our oil pump primer allows you to effortlessly spin the oil pump using a drill motor, increasing oil pressure and circulating oil to the top of the engine before starting. This crucial step helps prevent unnecessary wear and tear on rotating and valve train components, ensuring a longer engine lifespan. Universal Fit for All Block Sizes: Designed to accommodate both small and big block engines, this primer is compatible with a wide range of popular sizes including 327, 350, 355, 383, 388, 400, 406, 427, 434, and 454. Perfect for any DIY mechanic or professional engine builder. Durable Billet Aluminum Construction: Featuring a specially designed billet aluminum sleeve, our primer accurately positions the shaft, minimizing wobbling and ensuring reliable operation every time you use it. Innovative Thick Shaft Design: The thick shaft includes a triangle-shaped end that provides a secure grip, eliminating slippage during use. Compatible with both 3/8" and 1/2" chuck hand drills, making it versatile and easy to use. Perfect for Chevy Engines: Specifically designed for SB/BB Chevy V8 and Chevy V6 engines, this oil pump primer is a must-have tool for any Chevy enthusiast looking to maintain peak engine performance.