I have a brand new, in the box, cam for a 364 from Howard's Cam.. will it fit a 322?? Are the cams the same?
Rad**** No! 264 and 322 are the same, 364, 401, 425 are the same. The 322 has 1.5 ratio rockers some later nailheads have 1.6 ratio.
Judd, I believe you are not correct. The earlier (264 & 322) rocker arms are 1.4 ratio and the later ones (364, 401 & 425) are 1.5. Your point is valid, but just wanted to clear up the values. Early rockers are steel, later are aluminum. The sought after adjustable rockers are the early style, but you can just run adjustable pushrods and get the same benefit. BTW, I have heard the rockers interchange, so you can run the later style on the early motors for a little extra lift.
322s have 1.5:1 rockers, later motors have 1.6:1 -- pretty certain of that. What makes the difference in cam interchangeability is that the 364-401-425 cam bearings are bigger diameter, so those cams physically won't fit in a 264/322. You can put the later rockers on a 322 to get a little more lift -- just check for valve/piston clearance before you fire it up! Steve.
I'm not sure on ratio but my info comes from long time Nailhead nuts. Also the 56 322 cam is cast and though it will fit 53 to 55 motors the lifters and distributor gear would have to be changed also. The 56 Dynaflow cam has longer duration and more lift than 53 to 55 cam, and 56 motor has higher compression and bigger exhaust valves and the head chamber is relieved around the exhaust valve for better flow. Judd
There are 1.7 ratio roller rocker for Nailheads in the works that also cure the problem of valve train geometry negating the extra lift from high lift cams. Thomas Telesco is the guys name making them I think. Judd
[ QUOTE ] There are 1.7 ratio roller rocker for Nailheads in the works ... [/ QUOTE ] Just came across this pic of the item in question
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