[David_Hayward (RIP)]

I find the postings fascinating as I grew up from early teens with sparking plugs and as a result when I was working for MOTORCYCLE MECHANICS magazine [30 years ago] on their advice column, I was able to advise on plugs.

My mum worked for Champions near London Airport for many years and she used to get me free plugs, some including the latest at the time Gold-Palladium, were brilliant when used in my two-stroke motorcyles. That is why I stuck with Champions, and grew to respect them, the company and the expertise. The company used to produce a little booklet with recommended sizes for every make, and hot and cold versions either side of the norm. Champions were taken over by Coopers years ago but I bet that they still have their central office that deals with queries of this nature. [THEY ARE NOW PART OF FEDERAL MOGUL of the USA]

May I take it that the position with regards to Chevrolets is better? I had an original, 1944 boxed AC that was fitted to CMPs. Do I take it that modern ACs equate to WW2 versions?

FURTHER COMMENT: I just checked on the web and see that other flathead users have tried the Champion H10, although there were comments that an Autolite equivalent was better. Do we know what the H10 translates into in the Autolite range? Types 216 and 437 were discussed on one site...437 for tuned engines, and 216 for stock.