no worries , thanks Andy, checked it out and it is a NH-196 so white it is!

Does anybody know what prospec quarter means?

I have been stripping it down to a chassis today ( engines out, wiring looms out , come to think of it its now down to a chassis on wheels!! ) I noticed on the 300 heads a hi and low setting on the side of the head where the cables are located. this is also at the top where the cables feed into ... any idea what this is, im guessing power valves at a higher rev range?? Also whats the adjustment for ? from hi to low? and do they both have to be exactly at the same point between hi and low or both at hi or both at low etc..

Thanks in advance , cheers

rob