Identify DG Performance head

[Cowboy Don]

Hey Guys,

I've got this DG Performance head laying around the shed and I don't know what it's off of.  The distance between bolt hole centres from front to back is approx. 53.5mm, from side to side is approx. 54mm and the bolt holes themselves are 10mm in diameter.  A rough measurement of the bore size by what I've got is around 51mm.
Check out the pics

[Freakshow]

These things usually fit hondas or so it seems every time i try to buy one for a Yam.

What size is the combustion chamber ?

[LWC82PE]

here is a yamaha one Freakshow

http://cgi.ebay.com/ebaymotors/Yamaha-YZ125-DG-Gold-Radial-Cylinder-Head-Vintage-AHRMA_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1207Q7c39Q3a1Q7c66Q3a2Q7c65Q3a12Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem150307110131QQitemZ150307110131

[Doc]

possibly YZ80 Don. Not RM80 as the stud size is too big but that's not to say it couldn't be made fit the early RM also if indeed is is for an 80..possibly yz100 also. Bore size to me says its not 125. Ya wanna sell it? 

[LWC82PE]

looks a lot like this one

http://cgi.ebay.com/ebaymotors/VINTAGE-YAMAHA-YZ125-DG-NOS-HEAD-EARLY-YZ-MOTOCROSS_W0QQcmdZViewItemQQcategoryZ34284QQihZ010QQitemZ200272755131QQrdZ1QQsspagenameZWDVW

[Freakshow]

here is a yamaha one Freakshow

http://cgi.ebay.com/ebaymotors/Yamaha-YZ125-DG-Gold-Radial-Cylinder-Head-Vintage-AHRMA_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1207Q7c39Q3a1Q7c66Q3a2Q7c65Q3a12Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem150307110131QQitemZ150307110131

No good LWC  - Smallest engine i own is a 250. so i need Dt1,2, SC or mx

[LWC82PE]

i will keep an eye out for you though

[LWC82PE]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230306750300&ssPageName=ADME:X:RTQ:MOTORS:1123

any good for anyone?

read detailed description