valve adj. on engine while on engine stand before. start up

str12-340 said
I'm curious, everything here says 1/4 to 1/2 turn preload. The machine shop set mine at 1/2 turn (340 TA heads and rockers), but both the DC Engine book and the FSM say 1&1/2 turns... Can anybody shed light on this?

Yeah, 1 to 1.5 turns down is too tight, IMO. I never go by the number of turns. I throw that out the window. I manually MEASURE preload.