Ratty tat tat under the valve cover.

[wanab5150]

We have multiple winners.......I checked all the rockers and they appear fine. I adjusted all the valves with 1/2 turn of preload. I turned the engine over several times with the starter the grabbed each lifter to confirm they were not loose. I found three that were loose with about .020 lash....wtf!

I assumed I did something wrong and loosened all the lock nuts again and started over. Again I cycled the engine and felt for loose rockers.....THERE THEY ARE AGAIN!

This time I rotated the engine and as the exhaust started to close I checked the loose rocker and it was snug??????????????? Then, I rotated the engine a bit and there the slop came back........On 3 rollers, no less!

Off came the intake and I found 3 lifters with slop in the needle bearings. The worst was .026 and the other 2 were about .020 slop. The rest were tight but I used a dial indicator and all were virtually immeasurable.

It made my day to find the bad roller lifters. Now I could use some recommendations on a new set. These have no name on them but have "AC8" on the side. I know nothing about rollers but am going to replace all of them..........Recommendations???

Also, I have a question regarding rebuilding the Roush engine at 15K miles.....Why?

[FWB]

for any roller application, Crower, or Morel i just don't trust anyone else.

i see Isky has a bushed lifter with no roller bearings but i have never used them nor have i ever talked to anyone that has. they look interesting though.

[patrickt]

There's like a billion hydraulic roller lifters out on the roads today -- these weren't solid rollers in an FE. Must have just been really, really crappy parts. I would not be happy.

[lippy]

Originally Posted by FWB

i see Isky has a bushed lifter with no roller bearings but i have never used them nor have i ever talked to anyone that has. they look interesting though.

Brent is using these lifters on my build and has experience with them. When we were choosing the parts I spoke with an engineer at Isky and he claimed they have test data that shows these lifters last 2-3x (or more) roller bearing lifters, and several of the guys at Isky use them on their daily drivers (I guess that's why they work at Isky) and have 40-50k+ miles on them with normal adjustment. It certainly sounds like a good design idea to me.

[patrickt]

Originally Posted by lippy

Brent is using these lifters on my build and has experience with them. When we were choosing the parts I spoke with an engineer at Isky and he claimed they have test data that shows these lifters last 2-3x (or more) roller bearing lifters, and several of the guys at Isky use them on their daily drivers (I guess that's why they work at Isky) and have 40-50k+ miles on them with normal adjustment. It certainly sounds like a good design idea to me.

How do you two know that they're not counterfeit parts?

[Bernica]

Originally Posted by patrickt

How do you two know that they're not counterfeit parts?

Yep, read the article in the latest Hot Rod magazine. Damn shame to the industry, but you just need to be aware.

[patrickt]

Originally Posted by Bernica

Yep, read the article in the latest Hot Rod magazine. Damn shame to the industry, but you just need to be aware.

Yeah, yeah, yeah, it's another subject that no one wants to talk about and everyone wants to pretend like it never happens. You know, like getting killed driving your Cobra....

[jhv48]

Originally Posted by wanab5150

Also, I have a question regarding rebuilding the Roush engine at 15K miles.....Why?

My Roush was sucking oil down the valve guides at 13,000 miles. We did a leak down test and found a couple of cylinders were at 35% leak down. When we took off the heads to do the guides and seals, we found a couple of cylinder bores were scratched and the rest looked like they had 100,000 miles of wear. So, we pulled it apart and found two pistons with small cracks. That's why the full rebuild.
If your oil use isn't excessive, do a leak down and see what you find. If all is ok, just replace the lifters and leave the rest alone.

[Gaz64]

Originally Posted by wanab5150

We have multiple winners.......I checked all the rockers and they appear fine. I adjusted all the valves with 1/2 turn of preload. I turned the engine over several times with the starter the grabbed each lifter to confirm they were not loose. I found three that were loose with about .020 lash....wtf!

I assumed I did something wrong and loosened all the lock nuts again and started over. Again I cycled the engine and felt for loose rockers.....THERE THEY ARE AGAIN!

This time I rotated the engine and as the exhaust started to close I checked the loose rocker and it was snug??????????????? Then, I rotated the engine a bit and there the slop came back........On 3 rollers, no less!

Off came the intake and I found 3 lifters with slop in the needle bearings. The worst was .026 and the other 2 were about .020 slop. The rest were tight but I used a dial indicator and all were virtually immeasurable.

It made my day to find the bad roller lifters. Now I could use some recommendations on a new set. These have no name on them but have "AC8" on the side. I know nothing about rollers but am going to replace all of them..........Recommendations???

Also, I have a question regarding rebuilding the Roush engine at 15K miles.....Why?

This time I rotated the engine and as the exhaust started to close I checked the loose rocker and it was snug???????????????

This is your first mistake, exhaust starting to close would be about 70 ABBC (110 BTDC). At that point, the intake could be on or near to the start of the opening ramp.
Rule of thumb is EOIC, exhaust opening-adjust inlet, inlet closing-adjust exhaust.