12th inlet 15th exhaust will suffice for nearly all engines unless its a old ford 1.6 GT because these were 22 exhaust but as they are as old as me then i dont think you will see many of them .On a lot of older long stroke engines the gap isnt so critical so long as the valve is closed .adjust by rule of 9 ,where all valves add up to 9 ,,so no1 down adjust 8 ---no2 down adjust no7 ,and so on this is the easiest way for a weeked mechanic
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