Rocker or Lifter Noise ??
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
http://forums.corvetteforum.com/1579607685-post12.html
If you look at the pic I posted, you may also want to pull a valve to see if the seat-> bowl transition is as bad as it was on the ones I worked with...
Last edited by billla; Feb 10, 2012 at 12:56 AM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I just noted that lift alone doesn't drive need for guideplates 
Just explaining my solution to the OP. I should have quoted post # 10
Melting Slicks
Joined: Oct 2002
Posts: 2,317
Likes: 111
From: St Louis MO
Look very carefully at the end of the valve - it may be worn badly. If it is, the valve must be replaced because it is important for the rocker tip to have a perfectly flat surface on the valve tip.
Also look at that pushrod for straightness. It is most likely bent to some degree.
Also look at that pushrod for straightness. It is most likely bent to some degree.
Le Mans Master
Joined: Dec 2006
Posts: 5,557
Likes: 9
From: Oquirrh Mountains
St. Jude Donor '09
I missed this, but you'll want to look closely at your pushrod slots. The one and only set of these heads I used where horribly machined - just junk. It's interesting to see Ben call out the Isky adjustable guideplates - that's exactly what we ended up using.
http://forums.corvetteforum.com/c3-t...ookin-for.html
If you look at the pic I posted, you may also want to pull a valve to see if the seat-> bowl transition is as bad as it was on the ones I worked with...
http://forums.corvetteforum.com/c3-t...ookin-for.html
If you look at the pic I posted, you may also want to pull a valve to see if the seat-> bowl transition is as bad as it was on the ones I worked with...
OP, I'm feeling a bit bad for you. Seems like we've opened the proverbial can of worms for you. Definately pull those heads apart!
Instructor
Joined: Jul 2006
Posts: 208
Likes: 0
From: Hamden CT
St. Jude Donor '12
If it was my car AND I was planning on keeping it I would tear down the entire top end. Pull the cam & lifters check for wear grooves on the lifters, wiped lobes on the cam etc. Bring the heads to a good head/machine shop and have them thoroughly checked/fixed. Basically start over so that I knew the top end was rebuit properly after I was done. Unfortunately you can never trust a previous owners work.
