Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Rocker contacting top of retainer on vortec heads
View Single Post
  #6 (permalink)  
Old 12-29-2012, 04:28 PM
MouseFink MouseFink is online now
Registered User
Join Date: Jun 2010
Location: TX
Posts: 2,488
Wiki Edits: 0

Thanks: 28
Thanked 271 Times in 251 Posts
What valves are you using?

Vortec valves have a .290" valve tip for self aligning rocker arms. Standard SB Chevy valves have .250" valve tips. If you use standard SB Chevy valves, self aligning rocker arms will contact the keepers.

I had to use Manley 11863-1 (E) 1.600" and 11860-1 (I) 1.940" valves and self aligning rocker arms. Ferrea does not have SB Chevy valves with a .290" tip. You must use Ferrea valves for a 351-C Ford.

Do not machine the Vortec valve spring pockets. They are too thin, use +.050" keepers to gain valve spring height. My heads have exhaust valve spring rotators which presents a special problem on the exhaust valves. I had to use .075" shims and + .050" locks " on the exhaust valve springs to get 1.750" assembled height. No problem with standard locks on the intake valve springs.

I am also using Comp Cams 26918 beehive valve springs. I enlarged the stock spring seat diameter from 1.250" to 1.320" in order to fit the Comp Cams beehive valve springs. I was even nervous about doing that.

Last edited by MouseFink; 12-29-2012 at 04:39 PM.
Reply With Quote
The Following 2 Users Say Thank You to MouseFink For This Useful Post:
flyingputz (12-30-2012), techinspector1 (12-30-2012)