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Return to Parts List Category : A- Small Block "LA" : Cooling System BSP 90820 BILLET ALUM STRAIGHT UP THERM HOUSING POLISHED ALUMINUM WITH O-RING SEAL $63.99 These Billet Specialties thermostat housings not only look good, but they also get rid of leaky paper gaskets thanks to their O-ring seal design. Uses 2.50" Thermostat Mounting Bolts 3.275" on center