I am wanting to put big value heads on my 308 and dont want to go to efi heads, was looking at L34 type heads and wanted to know what the difference is and if their is one between L34 heads and yella terra heads as I have seen some yella terra heads on ebay recently the going price seems to be about a $1000 for decent yella terra or L34 heads. There is a shop in Melbourne who will covert my stock heads and reco them for about the same price, also are roller rockers the best way to go with the heads.