Derale High Performance Aluminum Flex Fan 17" # DER-19817 Cylinder Head This is because there are

This is because there are two mounting locations for the Ford Alternator depending on what accessories you are running

EDELBROCK 4150 1" Phenolic Carburetor Spacer Square-bore 4 hole + studs # ED8711

For cable driven applications

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Ford 351 Windsor Edelbrock Pro-Flo 4 EFI Fuel Injection System 625HP # ED35950

Derale High Performance Aluminum Flex Fan 17" # DER-19817 Cylinder Head This is because there areDerale High Performance Aluminum Flex Fan 17" # DER 19817 17" HP Alum. Flex Fan (Red Blade Black Hub) Aluminum Fan Specifications: Diameter: 17" Flange bolt spacing: 1 3 4' 2 1 4" Depth: 1 1 8" Mounting surface to front: 1 4" Mounting surface to rear: 7 8" Blade pitch: 500 Rotation: Standard (clockwise) Hub construction: Powder coated black steel Blade construction: Anodized red aluminum