Head Thickness
139.2mm was standard
138.68mm is the 'lowest' you can go down to
However, many many heads are used beyond 138.68mm, but the lower you go the weaker the valve seats become.
138.68mm is the 'lowest' you can go down to
However, many many heads are used beyond 138.68mm, but the lower you go the weaker the valve seats become.
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