Reply to "Identify rocker arm"

Thanks for the posts. Interesting topic for the OP. I can’t take credit for the picture. I think it may have actually been posted by Blizz on the old 335 series forum back in 2008. I snagged it because these two happened to be from the same manufacture for the two applications of 351c & BBC. It did show the two varied by more than just a small amount in ratio. I added the blue lines and shared what I had seen/measured and it was part of a pretty good discussion on the subject of BBC vs 351c rockers.

Before I posted that picture here I went back and tried to search the thread at the new forum but couldn’t find it. -Maybe someone handier than I can find it.

At the time I had bought a set of Comp Magnum steel rockers from Comp that were advertised 1.73 351c/460 but were marked 1.7 351c/460 when they arrived. The cup position did not appear different on them. When I called Comp they said they were all the same rocker which prompted some discussion but no satisfactory explanation. I did end up using them without issue. It was a hydro-roller stroker sbf. At the time, there seemed to be a rash of complaints of pushrod interference on rocker bodies, heads, and having to split guide plates which can happen due to a variety of contributing factors with about any rocker. At the time I was thinking the difference shown in the picture could have been a contributor. -I never had any problem with them though.

Best,
K