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These Speedmaster 8-71 and 6-71 supercharger manifolds are aluminum constructed and suitable for competition or street use
This casting process creates a much more uniform and robust cylinder head
oil temp will run approximately 5-10 degrees cooler
They are heat-treated prior to thread rolling and machining and are rated at a whopping 190
supercharged
Chevy SBC 350 Vortec Center Bolt Fabricated Valve Covers Polished Tall w/o Hole These Speedmaster 8-71 and 6-71
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