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The JBA Cat4Ward header for 1987–1991 Chevrolet Blazer and compatible GM trucks with 5.0L/5.7L SBC engines (silver-coated primaries) replaces restrictive manifolds to improve exhaust flow and engine efficiency. It pairs mandrel-bent stainless tubing with 3/8" machined flanges, oversized ports and JBA's Firecone collector, and includes factory-style emission connections and installation hardware for a no-leak fit.
JBA 87-91 Chevrolet Blazer 5.0L/5.7L w/o A.I.R. 1-5/8in Primary Silver Ctd Cat4Ward Header
