I found this on the net while searching for 'coolant air bleed valve' it seemed a useful thorough article
http://www.v8register.net/FilesV8WN/V8NOTE374%20V8%20engine%20cooling%2029.1.08.pdf
if not please delete [:)]
TR7 V8 1982
Reliant Scimitar GTE 6a 78
Kawasaki ZX636R
Piaggio fly 125
RIP Stick 2013
