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#1
10-23-2025, 09:29 AM
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Check out my new paper weight....
I dropped a valve a couple months ago and finally got to pulling the engine and tearing it down to have the block assessed. Good times!
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO 
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#2
10-23-2025, 09:36 AM
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Duuuude nice paper weight.. What was the valve situation thesis of breakage?
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........... The More You Follow The Herd The Less You Can Be In The Lead .......... |
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#3
10-23-2025, 10:03 AM
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Quote:
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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#4
10-23-2025, 10:12 AM
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Do you recall source of the keeper, Apparently it was lacking some strength
__________________
........... The More You Follow The Herd The Less You Can Be In The Lead .......... |
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#5
10-23-2025, 10:31 AM
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Quote:
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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#6
10-23-2025, 11:10 AM
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Looks like one of those awards from a local car show
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color me gone |
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#7
10-23-2025, 11:14 AM
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A little JB Weld and it'll be good as new.
__________________
My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
| The Following User Says Thank You to Bill Hanlon For This Useful Post: | ||
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#8
10-23-2025, 11:47 AM
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What do the other valve stems look like on ones that did not drop?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
| The Following User Says Thank You to steve25 For This Useful Post: | ||
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#9
10-23-2025, 12:21 PM
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Those look like factory type replacement valves, head could have come off.
.
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#10
10-23-2025, 01:34 PM
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Quote:
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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#11
10-23-2025, 01:38 PM
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Quote:
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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#12
10-23-2025, 02:10 PM
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Yeah that looks like the common failure point for the OE valves.
Can you look on the paperwork and see if the valves were replaced, and a part number? .
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#13
10-23-2025, 02:40 PM
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Quote:
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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| The Following User Says Thank You to Qball For This Useful Post: | ||
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#14
10-23-2025, 05:19 PM
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Guessing the dynamics:
Head falls off, valve stem popps-up, rocker/ pushrod displace, Keepers fall out of retainer, valvestem goes down into CYL for chomping. |
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#15
10-23-2025, 05:46 PM
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Yeah if they were SS valves, then it was either keepers, retainers, maybe rocker contact on retainer, etc.
Bummer. Sorry to hear about this by the way... .
__________________
. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#16
10-23-2025, 06:20 PM
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That retainer in that first photo has witness marks that looks like the rocker arm started to ride on it.
That would have compressed the spring and then released it which would have hammered the lock and failed it. I don’t know that any grade of keeper could take that kind of pounding for long. That roller tip sweep pattern on the top of those keepers is hard to explain. Do I see that a jam nut was used to adjust those rocker arms? What rpm did this mayhem take place at?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 10-23-2025 at 06:26 PM. |
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#17
10-23-2025, 06:48 PM
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Quote:
it happened around 12-1500 RPM. It was in my garage. My theory is (and I could be way off base), the keeper started to give way and the valve stem started to sink and that allowed the rocker to make contact with the retainer. Then the keeper finally let go and the valve dropped fully in. If you look at the pics of the keeper, it looks like the ledges that hold the valve up are sheared off.
__________________
Let me have a Diablo sandwich and a Dr. Pepper and make it fast---I'm in a goddamn hurry! - Mike 1967 GTO
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#18
10-23-2025, 10:08 PM
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Quote:
Rocker/retainer interference from short pushrods can do that. The rocker becomes a valve spring compressor, out come the keepers and then pop goes the weasel. Check for interference especially if the keepers look fine.
__________________
Triple Black 1971 GTO |
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#19
10-24-2025, 07:41 AM
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Understand what you guys are saying about rocker contact but if a lock goes south slowly because of bad heat treating the keeper will gain installed height then conceivably touch rocker as well..... So it comes down to which spot exhibits more wear time before total carnage and that's where it all started
__________________
........... The More You Follow The Herd The Less You Can Be In The Lead .......... |
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#20
10-25-2025, 02:28 PM
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what does the rocker sweep pattern lock like on the other valves?
__________________
GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
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