The Magic Blue Heads were made by Tom Muggleston who no longer makes them. They are peculiar by the fact that the Glow Plug hole is slanted to the rear of the engine aswellas being anodized Blue. The rest of the modifications to make the Fox .35 run GREAT are: ST NVA, Stuffer Back Plate, and do not shrink down the venturi oriface! The ST NVA will run just fine if left alone! Shorten the Needle by heating it cherry Red, letting it cool, ane then bend it over so as to nor break off if ship is landed upside down. Cut off excess, these mods for profile mounts, file of sharp edges!
Good Luck!
Phil Spillman