Pocket valves. F, J, JD '19-'29. Singles '26-'34. VL, VLH '30-'36. DL, RL, WL, WLA, WLC, WLD '29-'52. Servi-car. XA 1942. EL, ELC, UL, ULH, FL, FLH '37-'66. Knucklehead. Panhead. early Shovelhead. 41 TA.
Pocket valves. F, J, JD '19-'29. Singles '26-'34. VL, VLH '30-'36. DL, RL, WL, WLA, WLC, WLD '29-'52. Servi-car. XA 1942. EL, ELC, UL, ULH, FL, FLH '37-'66. Knucklehead. Panhead. early Shovelhead. 41 TA.