[67_C-30]

For the record guys, 305 have heads do not have 64cc chambers. They range from 58cc - 60cc chambers. Companies like Aerohead and others enlarge the chambers with valve deshrouding cutters and make them 64cc but they come from the factory smaller. The run-on problem they are notorious for is due to a small chamber with severely shrouded valves that create excessive heat. This causes the "dieseling" effect. If the timing is kept on the low side they do perform OK on a 350, but unless I was on a shoestring budget and had them laying around, I'd go another route. I've ran them in past on 327's and 350's with pretty good results, but I wouldn't buy a set and spend money on valve job when Vortecs and others can be bought so reasonably. They actually work really well on a 307 though...