The hits keep coming. Loud tick from the 454 - Chevelle Tech
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post #1 of 25 (permalink) Old Jul 22nd, 16, 11:02 AM Thread Starter
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The hits keep coming. Loud tick from the 454

Just got the new M20, bellhousing and exhaust installed this week and now this. I've noticed a tick from the engine for a bit but thought it was probably an exhaust leak. It doesn't get driven much so I let it be because the trans was the priority.

The new Pypes exhaust is quieter at idle than what was on it so this is much more pronounced. No idea what it is but I guess I'll pull the valve covers this weekend and see if there's anything glaring.

I'm new to older engines so if anyone can guide me in the right direction as where to start, I'd appreciate it.

The engine is a crate 454 that was supposedly rebuilt before we got the car. No idea how old it is because I can't see any numbers from the top.

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post #2 of 25 (permalink) Old Jul 22nd, 16, 11:29 AM
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Re: The hits keep coming. Loud tick from the 454

I would pull the valve covers for sure and see what's going on.. but you say you just changed trans etc etc, I would be looking for possibly a loose bolt. Use a long screw driver or something as a stethoscope to find out where its coming from.
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post #3 of 25 (permalink) Old Jul 22nd, 16, 11:33 AM Thread Starter
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Re: The hits keep coming. Loud tick from the 454

It sounds like it's coming from the front of the motor to me.
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post #4 of 25 (permalink) Old Jul 22nd, 16, 11:38 AM
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Exclamation Re: The hits keep coming. Loud tick from the 454

Quote:
Originally Posted by Bart_Swisher View Post
I would pull the valve covers for sure and see what's going on.. but you say you just changed trans etc etc, I would be looking for possibly a loose bolt. Use a long screw driver or something as a stethoscope to find out where its coming from.
/\/\/\this
sounds like valvetrain noise=start with pulling valve covers to see possible loose/bent/broken parts

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post #5 of 25 (permalink) Old Jul 22nd, 16, 2:50 PM Thread Starter
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Re: The hits keep coming. Loud tick from the 454

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Originally Posted by VinceS427bb View Post
/\/\/\this
sounds like valvetrain noise=start with pulling valve covers to see possible loose/bent/broken parts
Definitely. Like I said, I'm not very knowledgeable on what it could be based on the noise. Rocker out of adjustment, collapsed lifter, bent pushrod? I'll at least pull the valve covers and see if there's something that even I can see.
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post #6 of 25 (permalink) Old Jul 22nd, 16, 3:07 PM
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Re: The hits keep coming. Loud tick from the 454

Did you convert from an automatic trans to the Muncie? If so, was the flywheel removed? To me, that sounds like more than just a "tick". It didn't make the noise before the trans work?

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Last edited by Pat_McNeil; Jul 22nd, 16 at 3:32 PM. Reason: added info.
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post #7 of 25 (permalink) Old Jul 22nd, 16, 3:44 PM Thread Starter
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Re: The hits keep coming. Loud tick from the 454

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Originally Posted by Pat_McNeil View Post
Did you convert from an automatic trans to the Muncie? If so, was the flywheel removed? To me, that sounds like more than just a "tick". It didn't make the noise before the trans work?
No, the car had a Saginaw 4 speed in it and I had the shop replace it with the Muncie. Flywheel was not removed.

It did make noise before but to me, it sounded like an exhaust leak. The exhaust on the car before was very loud, even at idle, so it made the tick less pronounced. With the new Pypes race pro system, it's a lot quieter at idle so the ticking is more noticeable.
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post #8 of 25 (permalink) Old Jul 22nd, 16, 4:05 PM
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Re: The hits keep coming. Loud tick from the 454

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Originally Posted by Gearhead SS View Post
No, the car had a Saginaw 4 speed in it and I had the shop replace it with the Muncie. Flywheel was not removed.

It did make noise before but to me, it sounded like an exhaust leak. The exhaust on the car before was very loud, even at idle, so it made the tick less pronounced. With the new Pypes race pro system, it's a lot quieter at idle so the ticking is more noticeable.
Gotcha. Let us know what the rocker arms and springs look like when you get a chance to remove the covers. Good luck.

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post #9 of 25 (permalink) Old Jul 23rd, 16, 7:50 PM Thread Starter
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Re: The hits keep coming. Loud tick from the 454

I was about to start diagnosing where the noise was coming from. I bought a stethoscope to see if I could at least pinpoint which side it was coming from. Started it up and the noise was gone. Figured I'd let it run for a bit and see if it came back when it was warm. Nothing. I let it run for about 10 minutes and the noise never came back. It sounded just fine.

No idea what I should do now. Should I still pull the valve covers off to inspect the valve train? Could it be related to the new trans? I'm going to go drive it here in a bit to see if it comes back after running it through the gears.
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post #10 of 25 (permalink) Old Jul 23rd, 16, 8:29 PM
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Re: The hits keep coming. Loud tick from the 454

Pull the valve covers. You may have popped a rocker arm off and it may result in other damage if the lifter leaves its bore.

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post #11 of 25 (permalink) Old Jul 23rd, 16, 8:33 PM
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Re: The hits keep coming. Loud tick from the 454

It may have been some dirt in a lifter and it cleared itself out. I'd run some Rislone engine treatment, Marvel mystery oil, transmission fluid, or your choice, for about 200 miles and then change the oil.

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post #12 of 25 (permalink) Old Jul 24th, 16, 1:06 AM Thread Starter
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Re: The hits keep coming. Loud tick from the 454

After I let the car sit for about an hour, I went back out and started it and the noise was back. Pulled the valve covers but there doesn't seem to be anything broken. Some of the rockers had a little bit of play and a few of them wouldn't move at all. I did find it odd that it appears that they painted heads with the valve train in and didn't bother masking anything off. Not that I've seen a lot of these but I don't remember ever seeing paint on the valve springs or rocker arms. Wonder if there's paint clogging something up. I took a lot of pics.











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post #13 of 25 (permalink) Old Jul 24th, 16, 9:14 AM
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Re: The hits keep coming. Loud tick from the 454

What kind of fuel pump do you have?

You say it is coming from the front of the engine - could be fuel pump pushrod.

I recently had a problem with the Holley 12-454-11 pumps. I tried 3 pumps, all made a very similar noise. I discovered that they have cast the engine block housings on them 1/4" too thick without changing the pump arm, which causes the pump arm geometry to be off and it makes the same tapping noise. The problem is the pivot point of the arm is now 1/4" farther from the block, and the pump arm sits about 1/4" farther out because they didn't change the pump arm to match, so the pushrod is now too short.

I took detailed measurements of all 3 Holley pumps, plus 2 stock pumps (no noise) and a Carter m4889 (no noise) and this was definitely the problem. My solution was the Carter m4889.

I've contacted Holley about it and even returned pumps and information and they are looking into the issue. But it's very very clear they have a manufacturing problem with them. Many people use them ok (don't know how) but in my case, it was a very clear problem.

So, check your fuel pump.

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post #14 of 25 (permalink) Old Jul 24th, 16, 9:35 AM
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Re: The hits keep coming. Loud tick from the 454

Here's some great ideas to check from a problem that I had.
Although yours,(from the video on a computer)sounds like a rocker,mine sounded like a bad lifter,and turned out to be bad bearings.Shows how deceptive noises can be sometimes.
https://www.chevelles.com/forums/18-e...g-me-nuts.html

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post #15 of 25 (permalink) Old Jul 24th, 16, 12:04 PM Thread Starter
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Re: The hits keep coming. Loud tick from the 454

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Originally Posted by lucifershammer View Post
What kind of fuel pump do you have?

You say it is coming from the front of the engine - could be fuel pump pushrod.

I recently had a problem with the Holley 12-454-11 pumps. I tried 3 pumps, all made a very similar noise. I discovered that they have cast the engine block housings on them 1/4" too thick without changing the pump arm, which causes the pump arm geometry to be off and it makes the same tapping noise. The problem is the pivot point of the arm is now 1/4" farther from the block, and the pump arm sits about 1/4" farther out because they didn't change the pump arm to match, so the pushrod is now too short.

I took detailed measurements of all 3 Holley pumps, plus 2 stock pumps (no noise) and a Carter m4889 (no noise) and this was definitely the problem. My solution was the Carter m4889.

I've contacted Holley about it and even returned pumps and information and they are looking into the issue. But it's very very clear they have a manufacturing problem with them. Many people use them ok (don't know how) but in my case, it was a very clear problem.

So, check your fuel pump.
Looks like it's an Airtex 40468.

The block is a 3999289 72-78 2 bolt main 454. Any recommendations on a replacement fuel pump?

Last edited by Gearhead SS; Jul 24th, 16 at 12:46 PM.
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