I saw an ad today on E-bay for high-lift rocker arms for the 235/261 and wondered what advantage, if any, they offered over stock?

http://cgi.ebay.com/ebaymotors/216-...Z004QQcategoryZ33624QQrdZ1QQcmdZViewItem


'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi