Suburban down.

[Pinger]

Rough method - skelp the top of the valve with a heavy hammer hard enough to unseat it and see if it returns as it should - like it looks like it never opened.

.

This isn't such a good idea.
Not unless you place a strip of softer (eg aluminium) metal between the valve tip and the hammer. Even then there's a danger of doing more damage than good. Better to improvise a lever.

 

[Pinger]

You mentioned wear in the rocker where it pivots around the stud.
In the picture below, can someone advise if the rounded spacer is as it should be?

Excessive friction here will put a bending moment on the stud and it is more susceptible to a bending failure than a pure tensile failure (that a tight valve or excessive lash would create).
Pure tensile failures usually show signs of 'necking' - a reduction in diameter that exacerbates the stress and the break exhibit a pip on both surfaces (which isn't present here).
I'd take a guess that the force required to create a tensile failure in that stud would rip it out of the alloy threads in the head before breaking the stud.

 

[Hipster]

This isn't such a good idea.
Not unless you place a strip of softer (eg aluminium) metal between the valve tip and the hammer. Even then there's a danger of doing more damage than good. Better to improvise a lever.

I use a brass hammer, no worrirs of chipping a valve stem.

 

[Hipster]

You mentioned wear in the rocker where it pivots around the stud.
In the picture below, can someone advise if the rounded spacer is as it should be?

Excessive friction here will put a bending moment on the stud and it is more susceptible to a bending failure than a pure tensile failure (that a tight valve or excessive lash would create).
Pure tensile failures usually show signs of 'necking' - a reduction in diameter that exacerbates the stress and the break exhibit a pip on both surfaces (which isn't present here).
I'd take a guess that the force required to create a tensile failure in that stud would rip it out of the alloy threads in the head before breaking the stud.

I ran a set of Comp ones about 10k miles and no didn't look like that. That looks pretty well chewed up to me. Not sure how or if they are hardened but the surface looks gone and into softer material.

Agree on fastener failures.

 

[SUBURBAN5]

I'm no where close to an engine expert but for sure you gotta slow your roll a bit. It's a PITA now but man you be even more pissed and behind the 8 ball if you half ass it deliberately or out of haste and it fails again. Is this a daily driver?

Yes it was a daily driver. Not anymore. And I agree. Everybody making Good points. I'm for it just "life" . Plus my wife lol

 

[SUBURBAN5]

This isn't about not wanting to dig in deeper it's about finding the root cause of the problem so it doesn't happen again or continue to do more damage. It's already been said that the intake needs to come off and the lifter pulled out of it's bore and the lifter and cam need to be inspected. The cam doesn't have to come out for this. A visual check will tell you if a lifter or the cam is in the process of being chewed up.

Slightly bent is too much. That pushrod is now junk.

If the cam and lifter are wiping out it can send metal through the engine and wipe out the bearings. Skipping this check can cost you quite a bit of machine work and a more costly rebuild so don't skip checking the cam. The valve spring set up is not as critical if you drive around like grandma never seeing the high side of 3k rpm, but it's extremely important if you like to romp on your stuff. Now you're familiar with it.

You noticed a problem and continued to drive it for 2 more days possibly doing more damage. Putting in a $3 rocker stud and the "slightly" bent pushrod to try without checking anything else is not the way to handle this, but it's the answer you're looking for.

We live in the information age. Download a service manual, google it, you tube videos, THIS SITE with plenty willing to help. Educate and familiarize yourself with the information you need. You need to look at the pics Playing with TBI posted. Rollers can flat spot from impact or lock up and chew up the cam just as well.

I agree with you. Finding the cause is key. I've definitely found that out the hard way in plumbing. Just getting nervous ima end up doing a rebuild. Or possibly trashed motor/pistons. I was just teasing my wife yesterday about how i just need a new motor. Think I jinx myself

 

[SUBURBAN5]

Is this the brand/size?

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[SUBURBAN5]

Got the vents painted last night

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[Hipster]

I agree with you. Finding the cause is key. I've definitely found that out the hard way in plumbing. Just getting nervous ima end up doing a rebuild. Or possibly trashed motor/pistons. I was just teasing my wife yesterday about how i just need a new motor. Think I jinx myself

Yep, never do that. You climb in rub the dash one time and tell it how much you love it and that we're going to have a good day! LOL

 

[SUBURBAN5]

Yep, never do that. You climb in rub the dash one time and tell it how much you love it and that we're going to have a good day! LOL

Speaking of dash lol

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