Collapsed Lifter Replacement Advice
Thread Starter
Staging Lane
Joined: Aug 2009
Posts: 74
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From: Grafenwöhr, Germany
Collapsed Lifter Replacement Advice i have a 2002 Trans am that has a collapsed lifter when i bought it, just want to get it back to a daily driver so my family can drive it until i come home.
i was told i could replace them with LS7 lifters and call it a day, is this true? im about to order some and have a buddy of mine who is well known for building high performance engines put them in for me so the engine is ready when i come home.
the engine just knocks bad when i start it up and can post a video of how it sounds, but just about everyone has told me that the LS1's are known for getting collapsed lifters. maybe a valve tap? or piston slap but its pretty damn loud for piston slap and it slowly quiets down once the engine is warmed up so thus is my theory it must be the lifter
would LS7's work or is there a better replacement?
i was told i could replace them with LS7 lifters and call it a day, is this true? im about to order some and have a buddy of mine who is well known for building high performance engines put them in for me so the engine is ready when i come home.
the engine just knocks bad when i start it up and can post a video of how it sounds, but just about everyone has told me that the LS1's are known for getting collapsed lifters. maybe a valve tap? or piston slap but its pretty damn loud for piston slap and it slowly quiets down once the engine is warmed up so thus is my theory it must be the lifter
would LS7's work or is there a better replacement?
I just dropped some heads on my 2000 Camaro, and replaced the lifters with the ls7 lifters. I also did my brothers Camaro that he spins pretty high revs in and they've held up great. Go for it.
If it quiets down after warm up it could just be lifter tick. I'm really not sure if what's being heard is actually the lifter or incorrectly sized push rods from the factory. But when the system fills up with oil everything quiets down. My car did this from the day I brought it home brand new off the dealer lot.
After I did H/C I put LS7 lifters in with the correct push rods and now my valve train is quieter than ever. FYI if you decide to swap lifters the LS7's are a good replacement, but you WILL HAVE to replace the push rods with the correct size. Get a PR checker and measure before you buy.
After I did H/C I put LS7 lifters in with the correct push rods and now my valve train is quieter than ever. FYI if you decide to swap lifters the LS7's are a good replacement, but you WILL HAVE to replace the push rods with the correct size. Get a PR checker and measure before you buy.
Thread Starter
Staging Lane
Joined: Aug 2009
Posts: 74
Likes: 0
From: Grafenwöhr, Germany
If it quiets down after warm up it could just be lifter tick. I'm really not sure if what's being heard is actually the lifter or incorrectly sized push rods from the factory. But when the system fills up with oil everything quiets down. My car did this from the day I brought it home brand new off the dealer lot.
After I did H/C I put LS7 lifters in with the correct push rods and now my valve train is quieter than ever. FYI if you decide to swap lifters the LS7's are a good replacement, but you WILL HAVE to replace the push rods with the correct size. Get a PR checker and measure before you buy.
After I did H/C I put LS7 lifters in with the correct push rods and now my valve train is quieter than ever. FYI if you decide to swap lifters the LS7's are a good replacement, but you WILL HAVE to replace the push rods with the correct size. Get a PR checker and measure before you buy.
TECH Regular
Joined: Jul 2011
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The LS7 lifter is now the only part you can get from the dealer to replace older LS lifters - it has superseded all the older LS1/LS6 lifters. They are supposed to be a direct drop-in replacement, so based on that I don't see why you'd have to buy different length pushrods. GM isn't going to specify a drop-in replacement that needs new pushrods.
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Make sure it's not an exhaust leak. Mine ticks badly when cold, sounds mechanical nature, but it's the driver's side manifold gasket leaking due to a broken bolt.
LS7 lifters are 0.050" taller than stock lifters, so you will increase your preload if you use the same pushrods. I measured mine and wen't with shorter pushrods, 7.350" I believe to give me about the same preload.
LS7 lifters are 0.050" taller than stock lifters, so you will increase your preload if you use the same pushrods. I measured mine and wen't with shorter pushrods, 7.350" I believe to give me about the same preload.
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You're spot-on with suggesting that he measure. It's always the best way to go.
The LS7 lifter is now the only part you can get from the dealer to replace older LS lifters - it has superseded all the older LS1/LS6 lifters. They are supposed to be a direct drop-in replacement, so based on that I don't see why you'd have to buy different length pushrods. GM isn't going to specify a drop-in replacement that needs new pushrods.
That's true...I guess I should have worded better. What I was trying to say was to get the quietest valve train possible he might have to replace the PR's. That's why I mentioned I wasn't sure if "lifter tick" was the actual lifter or an incorrect sized PR's from the factory.
Thread Starter
Staging Lane
Joined: Aug 2009
Posts: 74
Likes: 0
From: Grafenwöhr, Germany
The LS7 lifter is now the only part you can get from the dealer to replace older LS lifters - it has superseded all the older LS1/LS6 lifters. They are supposed to be a direct drop-in replacement, so based on that I don't see why you'd have to buy different length pushrods. GM isn't going to specify a drop-in replacement that needs new pushrods.
