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I would appreciate it if someone could help me identify these 38mm x 105mm AR Engine Valves (8) which have an odd stem shape (see attached pix).
Partial Part number on box and Valve engraved “LIVIA K3 FS”.
 

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The ARI Performance Manual lists 105.11.03.301.00 as exhaust valve for 1300 and 1600 models with a remark of "37 Dia. Single Plug".
 

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valves

Look like GTA /GTA JR. valves. Not sure of head dia off the top of my head. GTA's used 8.5 mm stem /guide ID with an 8MM stem at the top . Used special GTA spring retainers with 750 1300 valve keepers. Groove at top is for valve pad retaining. There is/was a ring that went into the groove.
 
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