SBC Modified Header Long Tube Crate 1-5/8 - 1-3/4 by SCHOENFELD $298.99 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Headers - IMCA Modified - 1-5/8 to 1-7/8 in Primary - 3 in Collector - Steel - Black Paint - Small Block Chevy - Kit