The CAD390 header fits 390/429 Cadillac engines in 1966 Coupe DeVille and other street rod and classic truck applications. Featuring a 3-tube design, the outer primary tubes are 1-5/8" diameter, while the center (or inner) tube is 1-7/8" diameter, and then exiting through a 2 " collector.We are finding that this header is fitting many more applications than what we have listed it for. The only issue we have found is that the various applications need different styles of reducers (or none at all). Typically this header set does not need a reducer, especially if you are running a 2.5" exhaust system. On some applications though there is not enough room to get around the bell housing (on one side only) unless you use an angle reducer. Additionally, if you are running smaller than 2.5" exhaust and you had enough room, you could then use a straight reducer. You can select which reducer option you want below to meet your needs. Includes all hardware necessary for installation. Features a 16-gauge primary and collector tube thickness with a 3/8" thick flange and a patented flange design requires NO gaskets. Tightest fitting header available anywhere! Made in the USA. Includes the header bolt set. Our Aluminized Ceramic Coating is available and RECOMMENDED on all Sanderson Headers. We apply a multi-layer inside and outside silver ceramic coating in-house to meet our high standards of quality, and polish the coated header to a high luster. This coating provides aerospace and military technology to your vehicle to control the heat in your engine bay, improve cylinder scavenging of exhaust gases, and increase the longevity of your header investment. Copper Collector Gaskets are recommended for all Sanderson headers. Sanderson Headers do not include collector bolts due to our customers' wide range of preference. We do offer a collector bolt set that features Grade 8 Bolts with Locking Nuts. The Patented Leak-Free Design that Sanderson Headers offer you is the only leak-free flange design on the market ... Do Not Attempt To Use Flange Gaskets! The raised flange on the Sanderson Headers will buckle the gasket during tightening and actually cause a leak! Sanderson Headers are NOT emissions legal on pollution-controlled motor vehicles. It is the purchaser's responsibility to verify local regulations for compliance. Wrapping your Sanderson Headers with ANY thermal tape voids your header warranty. The best thermal protection for your headers is our Aluminized Ceramic Coating that is available for every Sanderson Header. Limited 5-year warranty.
This part fits most Cars and Trucks.; exceptions may apply. Please read the complete description to see if this part fits your specific vehicle and application.