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They have 5/16" hex-heads and come in sets of (8) with reusable bowl screw gaskets
GM F-Body 1970-81 / GM X-Body 1975-79
No other performance differential has the reputation for delivering traction in mud
standard flangeSince 1938
3500 Plus RPM Stall
Hedman Headers - 3" Collector - Steel - Uncoated - Big Block Ford - 1988-1997 H775C04 They have 5/16" hex-heads andThe Mid Length Tube Header Design Provides Significantly More Low and Mid range Power than Cast Manifolds, and Provide Better Ground Clearance And Component Compatibility Than Long Tube Headers. Ball & Socket Collector Design requires No Gasket, and Allows For More Exhaust System Misalignment than Old School, Gasket Style Header Collectors Includes All The Necessary Mounting Hardware, Gaskets and Reducers (exhaust adapters) Limted Lifetime Warranty On
