Oldsmobile 307-403ci V8 Designed for street 307-330-350-403ci Oldsmobile V8s, 1966-85 with EGR. Will fit 1980-1/2 to 1985 307ci V8's with 5A heads (casting #3317). Installation Notes: Port exit dimensions: 1.18'' x 1.86'' Manifold height: (A) 2.50'' , (B) 3.90'' Carb pad height: 3.20" Click here to determine carburetor pad height. Edelbrock Performer Series carburetors and AFB carburetors will NOT fit this manifold. Use OEM 4-bbl only with 403ci Pontiac Trans-Am (for shaker hood clearance). EGR block-off plate included. Use choke block-off plate p/n 350-8951 (included). Factory cruise control will not clear EGR valve without linkage alteration. For EGR applications, use stock carb only. HEI will clear this manifold. Carburetor Recommendations: OEM 4-bbl. carburetor
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