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Bill Harris · 07-21-2007, 10:01 AM

I run a '71 429SCJ Mustang in D/SA like Vic Guilmino and I have also had a lot of rocker arm breakage in the past. Every couple of passes I would break a rocker, usually an intake (the 429 has a 2.25" intake valve which is pretty heavy). I also had a lot of cases where the "sled" fulcrum would split in two. A couple of years ago I bought a brand new set of rockers and fulcrums and had them cryo treated. I have not broken a single one of them (knock on wood). I don't race nearly as much as Vic, and he is making a lot more power than me so his cam may be a lot more agressive than mine. But I did find that the cryo treated rockers seem to be a lot more durable on my setup.

Bill H

07-21-2007, 10:01 AM	#11
Bill Harris Member Join Date: Mar 2002 Location: Ooltewah, TN Posts: 421 Likes: 13 Liked 26 Times in 13 Posts	Re: Roller Rockers in Stock Elim? I run a '71 429SCJ Mustang in D/SA like Vic Guilmino and I have also had a lot of rocker arm breakage in the past. Every couple of passes I would break a rocker, usually an intake (the 429 has a 2.25" intake valve which is pretty heavy). I also had a lot of cases where the "sled" fulcrum would split in two. A couple of years ago I bought a brand new set of rockers and fulcrums and had them cryo treated. I have not broken a single one of them (knock on wood). I don't race nearly as much as Vic, and he is making a lot more power than me so his cam may be a lot more agressive than mine. But I did find that the cryo treated rockers seem to be a lot more durable on my setup. Bill H