My home inspection of Speedmaster heads
This plug is probably too long, but there are a limited (so far 1) number of 14mm gasket plugs with a reach longer than .750
NGK Spark Plugs LFR6CGP: G-Power Resistor Spark Plug 14mm x 1.04" Reach | JEGS
https://www.ngk.com/product.aspx?zpid=9873
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