Hourglass Spacers 3/8in ID x 1in OD x 1in Long

The Hourglass Spacers 3/8in ID x 1in OD x 1in Long by Allstar Performance are precision-engineered cylindrical spacers designed for engine builders, drag racers, and street machine enthusiasts who demand exact positioning of rotating components. These hourglass-profile spacers maintain critical clearances between crankshaft, camshaft, and accessory drives, ensuring proper alignment and preventing wear on precision bearings. Whether you're assembling a competition engine or restoring a classic muscle car, these spacers provide the dimensional accuracy required for reliable long-term operation.

Machined from hardened steel with a 3/8-inch inner diameter and 1-inch outer diameter, the hourglass spacer profile—narrower at the center, wider at the shoulders—distributes load evenly across bearing surfaces while reducing friction and vibration. The 1-inch length provides the exact spacing needed to separate components without introducing harmful axial play. Allstar Performance's precision manufacturing ensures tolerances tight enough for high-RPM applications, preventing component migration that can cause catastrophic engine failure in forced-induction or nitrous-assisted builds.

These spacers are essential for anyone rebuilding small-block or big-block V8 engines, particularly in racing and performance applications where tolerances matter. Installation is straightforward—slide them onto the crankshaft or camshaft journal between the block and pulleys or gears—making them compatible with virtually all American V8 platforms from classic iron to modern LS variants. At just 0.11 lbs per unit, you can stock multiple spacers for various applications without inventory burden, and the compact 1-inch length ensures they fit tight engine bays and tight-tolerance builds.