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I’m just a backyard mechanic, but from my perspective bent pushrods come from incorrect cam timing, incorrect rocker arms, incorrect rocker arm studs (or installation), or improper rocker arm gap. There’s always the remote possibly of a backfire.
Good luck. Please post the actual reason.
I definitely will. I'm going back in their Monday to check on things. Thanks!
 

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bad gas didn't cause that. bad repair work did. holy cow, thats not, not good. make sure the cam lobes arent wiped out.
 

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Inspect the lifters and lobes. To compress those pushrods untill they bent there was excess load somewhere else too. So lifters and lobes could also be damaged. Coil bind could be root cause. Check springs when valves are full open. Pushrods too long. Check lifter preload. If cause is piston to valve contact then valves could be bent. This would show up with a compression test or leak down test.
Bad gas. Not a chance that is the cause.
 

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I have seen them bend when a guy installs the rocker shaft with an air ratchet too quickly. I have also seen old gas varnish up and when it cools off and you go to start, bent pushrods due to stuck valves.

Could be either or both, if the car had old gas, even mixed with fresh, could have been some varnish.
 

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I just got my 66 Gal back about a week ago from the engine re builder. The throttle response feels the same as it did before the rebuild.
I wonder if you had bent rods before? Instead of R/R whatever part was causing the problem, they just re-used it.
 

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Discussion Starter · #26 ·
I have seen them bend when a guy installs the rocker shaft with an air ratchet too quickly. I have also seen old gas varnish up and when it cools off and you go to start, bent pushrods due to stuck valves.

Could be either or both, if the car had old gas, even mixed with fresh, could have been some varnish.
Wow, thats pretty crazy. Makes sense though.
 

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So, what did they find (on your Monday visit)?
They found 2 bad lifters so far. They won't tell me if they were installed incorrectly or if they were just bad. They said the lobes are OK, and everything else they have found so far. I'm skeptical at this point. Now I'm worried that engine won't last long.
 

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Questions (not from a critiquing point, but from an education point).
1. Solid or hydraulic lifters?
2. What’s “bad” about the lifters? If they’re hydraulic lifters, if they don’t pump up, that would create more slack (less chance of interference). I suppose if the hydraulic lifters locked up in the “up” position, that might cause a problem.
Unless they were the incorrect lifters, this is a new one for me. Thanks for keeping us posted.
 

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Questions (not from a critiquing point, but from an education point).
1. Solid or hydraulic lifters?
2. What’s “bad” about the lifters? If they’re hydraulic lifters, if they don’t pump up, that would create more slack (less chance of interference). I suppose if the hydraulic lifters locked up in the “up” position, that might cause a problem.
Unless they were the incorrect lifters, this is a new one for me. Thanks for keeping us posted.
It's my bad for not knowing if they are solid or hydrolic. I know when they first got my first nine running they said 2 of the lifter were "sticking" and sometimes this happens and will work its self out. I don't think they are keeping stuff from me persay, but they definitely aren't telling me something.
 

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If the hyd lifter sticks down it can let the push rod move out of the rocker arm and get bent. This is what it sounds like happened to me but with out being able to look at the engine it's only a guess. You should have heard a tapping noise coming from the engine.
 

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Discussion Starter · #34 ·
I called the shop yesterday to check on my Gal since its been a few weeks. I thought they were just replacing the rods and lifters. Now I guess they are pulling the entire engine and going over everything. Im pretty sure the builder did something wrong with the build that they are not telling me. Im worried they are going to try to cut corners now just to get it out of the shop quickly. I definitely made the wrong choice on shops and builders. Live and learn I guess.
 

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Might have better luck walking down there and talking to the mechanic instead of the front office.
 
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