Does anyone have a set of original (or aftermarket Hepolite or similar) piston rings for a Big 4 Norton? Bore size is 82mm and I need some +.060 rings.
Being the same bore as an M20 those rings might be suitable but I thought I'd ask before I start measuring. Also,is the Big 4 the same size in the bore as a 16H?..Ian

Thanks Rik...I haven't tried anyone yet...but I am at Stafford next weekend anyway. I have +.060 M20 rings...just out of interest I will measure those...Ian

Ian, there is amall parcel on it's way to you for Leon, you should get it tomorrow, I thought I'd send it to you as I'm unable to get to Stafford this year.

email (option): davmax@ntlworld.com

Ian, did you find a source of + .060 Big 4 rings ? A friend over here is looking for a set.