This is an original GM high performance aluminum intake manifolds for Big Block Chevy engines with rectangular port heads and a Holley carburetor. The casting number is 3866963 as shown. The 3866963 intake was used in the 1965 model years only on the high performance L78 396/425HP engines. The casting date on the underside is 3/15/65 which obviously can not be seen when installed. This is a very hard to find production dated 3885069 intake. This intake is in very good condition as shown. It is in bare aluminum finish with no paints or coatings and looks more like a piece of jewelry than a mechanical part. The part number, firing order, and all important Winter’s Foundry casting mark are all intact and undisturbed. I see no breaks or repairs to this intake. All threads are in good condition with no helicoils or thread inserts. The plenum is the open style as used by GM on the 66-67 L88 engines for more high RPM performance as shown. There is no porting or corrosion. This is an awesome factory high performance aluminum intake. This is your chance to own the real deal 3866963 intake you have been dreaming about at a GREAT PRICE. Don’t Miss Out! Check out my other listings for more rare and hard to find parts. The item “3866963 Original GM Aluminum Intake 1965 Big Block Chevy L78 396 425HP BBC SWEET” is in sale since Thursday, July 22, 2021. This item is in the category “eBay Motors\Parts & Accessories\Vintage Car & Truck Parts\Air Intake & Fuel Delivery”. The seller is “super-novass” and is located in Santa Cruz, California. This item can be shipped worldwide.

• Interchange Part Number: 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
• Brand: Chevrolet