Schoenfeld - 1.75 to 1.875 in Primary - 3.5 in Collector - 18 Degree Head - Small Block Chevy (Pair) 3.1171R The mounting housing is strong

The mounting housing is strong and indexes for a quick connection

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new smaller case

13/16"-16 Thread Size

270 in Springs

Schoenfeld - 1.75 to 1.875 in Primary - 3.5 in Collector - 18 Degree Head - Small Block Chevy (Pair) 3.1171R The mounting housing is strongProduct Description: Headers 1. 75 to 1. 875 in Primary 3. 5 in Collector Gaskets Hardware Included Steel Black Paint 18 Degree Head Small Block Chevy Pair Founded in 1974, Schoenfeld Headers is the largest circle track header manufacturer in the world. Schoenfeld Headers is the manufacturer of competition headers, mufflers and exhaust systems. Schoenfeld Headers listen to their customers, understanding your needs and giving you a quality product at a