[Z06] WCCH Heads... 15k mile wiggle test.
01-27-2015, 12:55 AM
#1
Racer
Thread Starter
WCCH Heads... 15k mile wiggle test... Hmmmmmmm
- WCCH Stage 2 Heads
- Bronze Guides
- Solid Stainless Exhaust Valves
- Dual Springs
- Heavy valve locks
- 15,000 miles
Discuss...
- Bronze Guides
- Solid Stainless Exhaust Valves
- Dual Springs
- Heavy valve locks
- 15,000 miles
Discuss...
Last edited by Gizmo5; 01-27-2015 at 01:40 AM.
01-27-2015, 12:59 AM
#2
Team Owner
01-27-2015, 01:36 AM
#4
Racer
Thread Starter
01-27-2015, 02:06 AM
#6
Ever since Hib Halverson made his comments in here, and on another forum, with regard to wiggle tests, and specifically wiggle tests performed by some of these shops out there, using vise grips and other questionable techniques, I look at wiggle test results in an entirely different light.
https://www.corvetteforum.com/forums...alternate.html
https://www.corvetteforum.com/forums...alternate.html
01-27-2015, 02:27 AM
#7
01-27-2015, 02:42 AM
#8
It would be helpful to know what brand of bronze guides are in the heads; that vendor first used one brand, then switched to another brand a year or two ago (from what I've read/heard).
Is the wiggle significantly more up and down than left-right? Even by feel?
Is the wiggle significantly more up and down than left-right? Even by feel?
01-27-2015, 04:31 AM
#9
Drifting
Ever since Hib Halverson made his comments in here, and on another forum, with regard to wiggle tests, and specifically wiggle tests performed by some of these shops out there, using vise grips and other questionable techniques, I look at wiggle test results in an entirely different light.
01-27-2015, 07:55 AM
#14
Who's car is this and when were the heads rebuilt?
Is this the car that AH was referring to back in July?
Is this the car that AH was referring to back in July?
The vehicle had headers only, no cam. The vehicle was brought into the shop by the new owner as a post purchase inspection. He was told when he purchased the car that the heads were rebuilt around 20,000 miles ago. I have no idea how the previous owner drove the vehicle (road, track, canyon runs, daily driving, ect...) or even if they were truly rebuilt 20,000 miles ago (sometimes when selling a car the seller doesn't tell the complete truth). We just did a wiggle test before removing and reworking the heads. Heads had bronze guides dual springs and SS exh valves. Most of the exhausts were right on the border of spec but two were substantially out of spec on the wiggle test (.0095" was the worst of the wiggle test results). Off the top of my head if I remember correctly it was the #5 and #6 exh valves that were the most out of spec.
I will try to find the full wiggle test result sheet for this customer and post it. The vehicle was in our shop 4 months ago.
I will try to find the full wiggle test result sheet for this customer and post it. The vehicle was in our shop 4 months ago.
01-27-2015, 08:56 AM
#18
Did you check rocker wipe/scrub when you installed the heads? Did you check seat runout and stem clearance and spring height when you installed them.
Or more importantly, did you do the work, buy the car from someone else?? What's the back story here?
01-27-2015, 09:01 AM
#19
Melting Slicks
personally i would never use bronze guides on my street car. my experience is they wear fast. love all the banter on this forum about valves/guides. looks like the repair on those heads didn't work out so well. still have stock setup on my 49k mile 07. still running strong. looking forward to the discussion why they are worn.
01-27-2015, 09:28 AM
#20
Reading Hib's article he makes interesting points.
Hib brought up several interesting points and his article made me wonder just how many cylinder head repair jobs have been sold to owners out there, based on wiggle tests using techniques which may or may not yield accurate results.
Halverson's article points out and explains very well, why some of the testing methods in use today when performing what is commonly referred to as "the wiggle test", present accuracy problems.
As such, any time I see video and or results of wiggle tests, I think back to some of what he writes in the article.
But one has already asked a very important question here: Why do a wiggle test if the head is already off as opposed to direct measurements?
Of course though, any video using a measuring technique which has recently come into question and attempting to show a competitor's offering in negative light, well that's going to work on some, but not others.
Of course after pointing this out now, I wouldn't be surprised if a listing of numbers indicating actual measurements were to appear.
As an aside, I suppose it's time for Katech and their customers to start getting concerned about that video, as WCCH has done much of their cylinder head machine work for them and using bronze intake and exgaust valve guides.
Hib brought up several interesting points and his article made me wonder just how many cylinder head repair jobs have been sold to owners out there, based on wiggle tests using techniques which may or may not yield accurate results.
Halverson's article points out and explains very well, why some of the testing methods in use today when performing what is commonly referred to as "the wiggle test", present accuracy problems.
As such, any time I see video and or results of wiggle tests, I think back to some of what he writes in the article.
But one has already asked a very important question here: Why do a wiggle test if the head is already off as opposed to direct measurements?
Of course though, any video using a measuring technique which has recently come into question and attempting to show a competitor's offering in negative light, well that's going to work on some, but not others.
Of course after pointing this out now, I wouldn't be surprised if a listing of numbers indicating actual measurements were to appear.
As an aside, I suppose it's time for Katech and their customers to start getting concerned about that video, as WCCH has done much of their cylinder head machine work for them and using bronze intake and exgaust valve guides.
Last edited by '06 Quicksilver Z06; 01-27-2015 at 04:13 PM.