Pretty simple question. I have what appear to be generic Crane roller rockers in my TF heads on my 347. I can't find any branding on them, except for the 1.6 ratio.
What's the advantage of going to a more expensive rr? I've read that TW heads need a select rocker arm because of the valves geometry. Is that the only reason to upgrade?
TIA
Hi,
You certainly want a good, solid yet lightweight rocker from a reputable MFG., especially with higher spring tensions
(I’m guessing you’re running Hydraulic roller, not solid roller-correct?)).
WhichTF head’s are you running, 170’s, 11R 190’s, 205’s?
If the Rockers you have are indeed Crane’s Gold series, it’s a great selection for a stout hot street level build. Crane is usually a fairly avid one regarding product ID.. even if a stamped ID atop the Rocker.
A few less than resilient brands have anodized in their color, can you post a pic?
TF Head differences..
TW’s specific centralized valve in chamber locations necessitate a lateral swing from front to back in the Rockers for proper valve stem to pushrod alignment (studs are offset from the valve stems slightly).
TW Valves are also slightly Canted (Tilted), where the stud is not, so the Rocker tip doesn’t strike the Stems dead square, a little more load they have to bear vs. a typical application.
Few pic’s...in order.
Cranes Gold series, Harland Sharp, Comp’s pro Gold, all very good Rockers. There’s better, of course- but do you need 600$ Rockers on a H.R. Street motor? No.
-Best!
John