I was doing a little reading about the lump port mod. They showed a open chamber head being cut for a 1.94 valve and it looked like the chamber was cut back for shrouding reasons. Is this a needed step or a race mod searching for every ounce of power? Also, Im not in a huge rush to get this head done so I may as well do it proper. Would the lumps be of good use in a truck application ? Also will these large valves and such have a major impact on fuel mileage? And last but not, Guides. Normal iron guides or those bronze liners. Is one better then the other?
