Part number BLK90134 is a straight-out thermostat housing designed for GM LS-series engines that use a separate water neck and thermostat. Machined from 6061-T6 billet aluminum with a black anodized finish, it features a 1½″ outlet for standard radiator hoses. The housing uses an O-ring seal (no gasket required) and comes with stainless steel mounting hardware for a clean, secure installation. Ideal for performance and custom LS swaps where durability and appearance matter.

• Application: GM LS-series engines with separate thermostat housing
• Outlet orientation: Straight-out, 1½″ hose connection
• Material: 6061-T6 billet aluminum
• Finish: Black anodized
• Seal type: O-ring included
• Hardware: Stainless steel mounting bolts
• Compatibility: Fits Edelbrock and other aftermarket LS water pumps
• Features: Compact design, leak-resistant seal, corrosion protection