November 20, 2006 at 6:02 PM #1 Late 66 build date. Emmission or non on oil filler cap.Using repop chrome hipo valve covers.Thanks
November 20, 2006 at 7:07 PM #3 I believe it depends on if the car is a California emissions car, not so much date. My 66 has no nipple on the oil filler/breather cap