482 fe intake issue

[Jerry Clayton]

This didn't all happen just over night----It was maybe lack of compatible lubricants/fuel issues?????? To be so bad pretty much on all cylinders---wrong choice of oil to go with fuels from that area???????excellant choice of seals restricted amount of lube to valve guides which then wore enough to kill the seals which then let in huge amounts of oil sucked thru the intake guides???????

[CLV8]

Hi guys and sorry for my late reply.

Here is a video of the valve/rocker movement. All are the same of course.

For BRENT here is too a picture of the reference seen on the camshaft.

I think there's not doubt now I have a problem with the pivot/rockers on the valves.

[CLV8]

Picture

[blykins]

That cam is 248/248 @ .050", with a .638" gross valve lift. You will lose .015-.020" lift to valvetrain deflection, so at 100% optimal, you're at .638" lift. In actuality, you were probably getting about .615" lift at the valve.

Hard to tell anything from a side video, but it looks like the rocker starts on the intake side of the valve stem and rolls through. If you're opening the valve more than .600-.650", then you're going to get an exaggerated view.

I don't know what you'll see now as far as geometry with a valve/valve guide worn that bad, but the T&D rockers notoriously set up perfectly on an Edelbrock head with a standard length FE valve. In your video, I can see the valve moving back and forth in the guide. That will skew the results of a geometry check. If you have .030-.040" of wear, that would mean that the valve can move side to side in the guide by at least .015", which can affect the geometry quite a bit.

I would be looking at the amount of wear that you see on the stem. If there's more wear there than .600" lift worth, then that narrows the issue down to a surface finish/plating issue.

[CLV8]

Originally Posted by blykins

That cam is 248/248 @ .050", with a .638" gross valve lift. You will lose .015-.020" lift to valvetrain deflection, so at 100% optimal, you're at .638" lift. In actuality, you were probably getting about .615" lift at the valve.

Hard to tell anything from a side video, but it looks like the rocker starts on the intake side of the valve stem and rolls through. If you're opening the valve more than .600-.650", then you're going to get an exaggerated view.

I don't know what you'll see now as far as geometry with a valve/valve guide worn that bad, but the T&D rockers notoriously set up perfectly on an Edelbrock head with a standard length FE valve. In your video, I can see the valve moving back and forth in the guide. That will skew the results of a geometry check. If you have .030-.040" of wear, that would mean that the valve can move side to side in the guide by at least .015", which can affect the geometry quite a bit.

I would be looking at the amount of wear that you see on the stem. If there's more wear there than .600" lift worth, then that narrows the issue down to a surface finish/plating issue.

OK Brent so first of all I'm going to replace the guides and once done check the rockers/pivots.

Problem: Craftperformanceengines doesn't reply to my emails !!!! How can I order the new guides ???

Thanks.

[blykins]

Originally Posted by CLV8

OK Brent so first of all I'm going to replace the guides and once done check the rockers/pivots.

Problem: Craftperformanceengines doesn't reply to my emails !!!! How can I order the new guides ???

Thanks.

You will need to replace the guides, valves, and then do a valve job before you check geometry.

Send me an email. I know I can get the valves, let me see if I can get you the guides as well. I'll sell to you at my cost plus the shipping.

[Grubby]

That is service after the sale.

John