Now you can bolt BIG tube headers onto your SB-Chevy!

When using GM and aftermarket cylinder heads with standard Chevy bolt pattern, you are limited to a 1.75'' header tube. Dynatech bolt-on adapter plates let you increase header tube size for maximum power. Dynatech adapter plates are CNC machined from 5/8'' billet aluminum, and have square windows machined to aid in port matching. Outer bolt pattern features threaded 3/8'' steel inserts. Includes plates and hardware for two heads.