Please ask your question below about Stan's Tri-Y Header Set for 1966-80 Scout 800 & Scout II, Terra & Traveler w/ 266, 304, 345 & 392 V8 An IHPA Salesman will get back with you during business hours which is Monday thru Friday 7:30AM to 4:30PM PST. Questions asked after business hours or during a weekend will be answered the following business day. Thanks!