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+--- Thread: Addition to plug queries (/showthread.php?tid=8149)
Addition to plug queries - Tiger - 08-11-2022
Just noticed on Jamie’s site the 2 plugs listed appear to have different base shape?
RE: Addition to plug queries - Reckless Rat - 08-11-2022
One is threaded 18mm diameter and the other one is threaded 14mm diameter. The 18mm plugs are for the low compression head and the 14mm for the late Ruby high compression head. They are not interchangeable.
Both these plugs have a flat machined base and should suit your car. (unless it has been modified by someone)