GM GEN 5 LT1 Header Flange - 3/8" Thick SS. Ports for 1-7/8" Primaries. firebird The compression valving options are

The compression valving options are the same as the Crusader Series

which shows an example of exactly what dimensions we are looking for

Rear bars are detachable using TIG welded couplers for ease of installation and shipping

304 stainless steel adapter spacer bushings

You might need to slightly modify that 3rd hole per side to use the included nut and washer hardware

GM GEN 5 LT1 Header Flange - 3/8" Thick SS. Ports for 1-7/8" Primaries. firebird The compression valving options areKooks Headers and Exhaust has been the leader in the High Performance Exhaust Industry for over 50 Years! Since 1962, Kooks takes pride in offering the best Headers and complete exhaust systems for your street, race and off road applications. We have won hundreds of championships and set countless records in the NHRA, IHRA, NMCA, NMRA, NASCAR, NASA, SCCA and many other racing organizations. Now with three generations of family leadership, we are proud