Above the guide. There is nothing between guide and rocker box but when fitting the guides, I put a smear of blue hylomar round the guide under the lip. Having warmed the head and (already fitted) rocker box in the oven, when you fit the guide the hylomar will give you a good but flexible seal between guide and rocker box.
36 4G, 37 VH, 54 KH(A), 75 Healey 1000/4, 52/53 ex ISDT KHA (project).
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.