67mm gasket

[leevarnado]

can someone tell me whats so different from this gasket(other than its copper)than a regular gasket.http://cgi.ebay.com/ebaymotors/Honda-185s-200x-Rare-67mm-copper-Big-Bore-Head-Gasket_W0QQcmdZViewItemQQcategoryZ43977QQihZ022QQi temZ350148672046QQrdZ1QQsspagenameZWDVW

[cr480r]

it just means that before the 200's were out a big-bore gasket was needed for bigbore kits on 185's.. that gasket allows up to a 4mm overbore on a 185 depending on what is available for pistons