Abe Posted July 10, 2012 Report Share Posted July 10, 2012 bought a pro design head used and the domes have only a 6 stamped into them , anyone know what size or who these are made by ? Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted July 10, 2012 Report Share Posted July 10, 2012 bought a pro design head used and the domes have only a 6 stamped into them , anyone know what size or who these are made by ? They can be anyone's. Have to talk to the person you got the head from. Quote Link to comment Share on other sites More sharing options...
Abe Posted July 10, 2012 Author Report Share Posted July 10, 2012 They didnt know as well, was hoping this was a pro design marking for a certain size and it would be recognized Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted July 10, 2012 Report Share Posted July 10, 2012 could be anyones domes.... you could either order another set that you know exactly what they are. or you could put the sparkplug into one and then seal it to a piece of plexiglass and fill it (thru a small drilled hole near the edge of the dome in the plexiglass) and measure what it takes to fill the dome.....this will give you the cc of the dome....however it will not give you the squish (which could have been custom cut to compensate for sqiuish) Quote Link to comment Share on other sites More sharing options...
Abe Posted July 11, 2012 Author Report Share Posted July 11, 2012 Just tried cc these my self and got right at 23cc in it, so my next ? Would be is the amount of water the spark plug holds deducted to get actual volume or is this included in the measurement. Plug holds .5 cc and I was a lil short of 23 so I'm thinking I may have 22cc domes Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted July 11, 2012 Report Share Posted July 11, 2012 the measurement needs to be done with the plug fully threaded in. it sounds to me like you maybe near 22 cc domes. The next step when you get your head installd on you bike is to do a squish band test to ensure that there is't anything major that is going to cause problems. Quote Link to comment Share on other sites More sharing options...
Abe Posted July 11, 2012 Author Report Share Posted July 11, 2012 i got some pics in my gallery now of them , also the area i was talkin about with the plug is down in the plug itself around the porcelin insulator Quote Link to comment Share on other sites More sharing options...
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