Lifter Tick?
Thread Starter
Heel & Toe
Joined: Dec 2021
Posts: 15
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Lifter Tick?
New cam and lifters installed, hearing this noise on first startup. I have 65psi oil pressure on startup and I have un bolted the rocker arms and re torqued them in the correct gm specs. Noise is 5x louder in person. Any help would be appreciated!
Attached a few videos down below
Attached a few videos down below
Last edited by Alex Noell; Feb 28, 2023 at 05:28 PM.
Thread Starter
Heel & Toe
Joined: Dec 2021
Posts: 15
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Safety Car
Joined: May 2016
Posts: 4,649
Likes: 1,832
From: Erlanger, Kentucky
So cam is 221/24X, .619/.617, 113 LSA. Assuming your car is an LS3, you are going from .551/.525 lift to .619/.617. Aftermarket cams increase lift by reducing the base circle size which means you usually need to use a longer push rod. And your lift is increased by 0.068 intake and 0.92 exhaust. Stock push rods are 7.4 and you likely need ones that are at least .050 to .075 longer for proper lifter pre-load.
I just do not understand these shops (even BTR who should know better). YOU ALWAYS NEED TO MEASURE FOR PROPER PUSHROD LENGTH. ALWAYS. It is the ONLY way to know exactly what you need.
I just do not understand these shops (even BTR who should know better). YOU ALWAYS NEED TO MEASURE FOR PROPER PUSHROD LENGTH. ALWAYS. It is the ONLY way to know exactly what you need.
Thread Starter
Heel & Toe
Joined: Dec 2021
Posts: 15
Likes: 0
So cam is 221/24X, .619/.617, 113 LSA. Assuming your car is an LS3, you are going from .551/.525 lift to .619/.617. Aftermarket cams increase lift by reducing the base circle size which means you usually need to use a longer push rod. And your lift is increased by 0.068 intake and 0.92 exhaust. Stock push rods are 7.4 and you likely need ones that are at least .050 to .075 longer for proper lifter pre-load.
I just do not understand these shops (even BTR who should know better). YOU ALWAYS NEED TO MEASURE FOR PROPER PUSHROD LENGTH. ALWAYS. It is the ONLY way to know exactly what you need.
I just do not understand these shops (even BTR who should know better). YOU ALWAYS NEED TO MEASURE FOR PROPER PUSHROD LENGTH. ALWAYS. It is the ONLY way to know exactly what you need.
Safety Car
Joined: May 2016
Posts: 4,649
Likes: 1,832
From: Erlanger, Kentucky
If you have the money, not a bad idea to order some push rods of different length, say 7.425, 7.450, and 7.475. Just send the ones back that aren't needed and get refunded.
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Thread Starter
Heel & Toe
Joined: Dec 2021
Posts: 15
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Okay so you are going from 0.525/0.525 lift to the 0.619/0.617. That is 0.094 and 0.92 increase. And just thinking about it, that lift increase is a consequence of the 1.7 ratio so you need to divide the increased lift by 1.7 which is a difference of .055 on the lifter side of the rocker. So I would bet a 7.450 push rod is what you need. But again, you need to measure so its good that you are getting the pushrod measuring tool.
If you have the money, not a bad idea to order some push rods of different length, say 7.425, 7.450, and 7.475. Just send the ones back that aren't needed and get refunded.
If you have the money, not a bad idea to order some push rods of different length, say 7.425, 7.450, and 7.475. Just send the ones back that aren't needed and get refunded.
Thread Starter
Heel & Toe
Joined: Dec 2021
Posts: 15
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Reviving this thread
So I had went ahead and purchase a pushrod measuring tool and it measured out to be a 7.45in pushrod. I had gotten those in today and installed them. Same noise so I am thinking that the lifters may be the cause of this problem any more insight would be appreciated.
Melting Slicks
Joined: Apr 2019
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From: Northern Wisconsin
Maybe the lifter bores rather than the lifters themselves.
Thread Starter
Heel & Toe
Joined: Dec 2021
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Safety Car
Joined: May 2016
Posts: 4,649
Likes: 1,832
From: Erlanger, Kentucky
The other possibility is that the cam was improperly ground. If the advance is off by a few degrees, it can cause what you are seeing. To check that, you will need to degree the cam. And this does happen from time to time. Seems to happens more commonly with cams ground by Comp Cams. Not sure who BTR uses for their grinds or if they do it themselves.
Another option you could pursue would be to notch the pistons. But I would check the cam first and if it is wrong, I'd get a new one. And obviously check it as well.