Just thought I'd make a post dealing with this problem as it's been a frustrating one all on its own.
For all those who wish to convert to a hydraulic roller valve train you might want to check the lifter bore first. This is where I had all this kerfuffle.
If your lifter bores look like these then you have nothing to worry about.
But if they look like these, then you could have a problem.
You can notice the lifter bore is plunged or counter bored down from the top. This removes vital surface area for the lifter. Especially a hydraulic roller lifter.
Thanks to PSIG he had a great idea of just getting the lifter bores sleeved. But it turns out no seasoned machinist in ABQ could or ever has done that to an FE.
Back to square one.
Another kind forum poster suggested Morel lifters. OK cool beans, chatted with them and they suggested Morel 5329 lifters as they would sit lower in the lifter bore than set 5325.
But it wasn't until on this kind forum that was noted those are limited travel lifters and it may be hard to eliminated rocker noise.
If it's one thing I've learned in all this is to either ask the same person twice the same question but on different days or ask different people the same question on the same day. If the answers coincide, super, if they don't, well then....
Long boring story short, I talked with another from Morel sales team and he wondered why the other would sell me 5329's limited travel when the 5325's would be better. <sigh> He said they both have the same body. So in looking at the website one has a different roller wheel diameter.
OK so I get that with the same body (axle height) the roller in one will push the body up in the bore. So I asked the first guy again and then I got the answer that both these lifters have the same size wheel.
So the website is wrong then?
kind of open ended at this point.
Feeling frustrated I said screw this (actually it was F-it)
and ordered both sets as long as I could return the unused set. So now I could compare both sets with my own eyes and see for myself.
Here's the result in picture form.
On the left is the Comp Cam lifter, the middle is the Morel 5325 and on the right Morel 5329. Both Morels do indeed have the same body, and same wheel size, so therefore the website is wrong, neither will sit any different in the bore.
As the cliche goes, the proof is in the pudding.
Interestingly enough I had called Crane Cams and received dimensions of the oil hole and top land height and it closely matches the Comp Cam lifter and my machinist suggested Lunati, of which I called and received dimensions and they closely match Morel.
So on the basis of phone conversations (non pudding proof)
the Lunati lifters should also work in situations of an FE block with plunged or counter bored lifter bores.
I thought maybe someone at Ford was just having a bad day with this '66 FE block, as the other two '66 FE blocks I have don't seem to suffer from this, but when I checked my '68 FE 390 block from my XL the Ford sadist machinist struck again. So it isn't such an isolated case as I thought it was.
The problem is the Comp Cam lifters oil hole and notch (cut out) come out of the limited bore and jet hot thin pressurized oil from the lifter feed out like a scalding hot toxic squirt gun.
The Morels will be below the lifter bore at all times (I've checked).
Hopefully this helps someone else out if they come across this situation and if I can prevent anyone elses head from spinning around like the Exorcist
I am only to happy to do so.