Features Will bolt to all 32-53 Flat Head Ford V-8 blocks Made of High Quality T-304 Stainless Steel Headers drop-down approximately 7.5" from mount surface to the bottom of the collector. At the exhaust ports, the header sticks out approx. 2.25" At the bottom of the block, the collector sticks out approx. 4.25" Collector OD is 2.5" Tube OD is 1.75" Fitment For 1932-1953 Ford Car Truck Flathead V8 For 136, 221, 239, 255, & 337 Cubic Inch Flat Head Ford V-8 engines