Doug Galbreath 1/2a Conversion Head

Doug Galbreath 1/2a Conversion Head
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Price: $12.00
Product ID : regular_KT50
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Description

Doug Galbreath conversion head. Screw-in fit for Norvel .049s and .061s, Cox .049s and .051s, and the first VA. This head uses Nelson glow plugs and improves engine performance over standard 1/4X32 plug conversion heads by sealing at the bottom of the plug. With Cox and Norvel plugs becoming rare, this head offers a good solution to the plug issue. Standard 1/4X32 plugs seal at the top of the threads, under the washer, and allow the threads to be part of the combustion chamber. Nelson plugs take the threads out of the picture. Accepts the Nelson HD (NL02), Nelson Hot (NL05), and Nelson Flat Element (NL03) plugs. A standard Cox .049 wrench fits this head. Standard 1/4X32 glow plugs will not work in this head. KIT TIP: With the KT50 Galbreath head with AMEs and Big Migs, you may find it necessary to use less head clearance (fewer head shims) than you were using with the Norvel plug. I recommend you first install the KT50 with the same number of shims you had been using. If all is well and power is comparable to the Norvel plug, or improved, you may want to stay there. If you want to optimize compression you can remove one shim at a time until you get maximum RPM or begin to blow glow plugs or have trouble holding a good needle setting. If you have been using a Cox plug you may want to add a shim or two when switching to the Galbreath head and then try removing one shim at a time, if you are down on power.

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