Okay. This may be a tough question. Are there any original 67-68 Mk1 owners out there who can confirm the color (if any) of the exposed pushrod tubes? I put a magnet to them and determined they are aluminum. While Thomason in his Guide to Originality says they were not painted black like the rest of th engine, he says no more. My guess is unpainted, untreated aluminum. The were likely pressed in once the head was installed? Thanks, Jeff