[tempest1964]

Just curious. I tried looking this Comp XR88HR cam up on their web site. Couldn’t seem to find it. Was curious about the lift of this cam. It would help to compare other HR cams with the same or less lift. Since these Sealed Power lifters have their limitations. Thanks in advance.

[P@blo]

Originally Posted by tempest1964

Just curious. I tried looking this Comp XR88HR cam up on their web site. Couldn’t seem to find it. Was curious about the lift of this cam. It would help to compare other HR cams with the same or less lift. Since these Sealed Power lifters have their limitations. Thanks in advance.

https://www.compcams.com/xtreme-ener...5-455-cpg.html

[Singleton]

There seems to be a fundamental misunderstanding concerning the different cams and the effect on these oem lifters.
These oem roller lifters will rise out of the lifter bores the same amount, (+- .010), regardless of camshaft used.
The larger lift cams have a smaller base circle, so that the lifters starting point is lower in the bore.
The lifter stopping point at its highest will be the same regardless of which camshaft is used, mild or wild.

[JC455]

Originally Posted by Singleton

There seems to be a fundamental misunderstanding concerning the different cams and the effect on these oem lifters.
These oem roller lifters will rise out of the lifter bores the same amount, (+- .010), regardless of camshaft used.
The larger lift cams have a smaller base circle, so that the lifters starting point is lower in the bore.
The lifter stopping point at its highest will be the same regardless of which camshaft is used, mild or wild.

Exactly! That’s why I was using a feeler gauge to show how the ‘top’ of the lobe was at the same height, regardless of cam type/design.
This is also why I was showing how much the lower oil band gets to the bottom of the lifter bore. As I said in my video,”The top of the oil band isn’t going to be our problem.”

[Singleton]

John, not sure if this was stated here or on the video, but what is the distance between the upper scribe line and the flat area on the lifter?

[JC455]

Originally Posted by Singleton

John, not sure if this was stated here or on the video, but what is the distance between the upper scribe line and the flat area on the lifter?

Which lifter? Which flat area?
I’ll try to get some detailed pics of the lifters with some measurements.

[Singleton]

Originally Posted by JC455

Which lifter? Which flat area?
I’ll try to get some detailed pics of the lifters with some measurements.

The 2148 that interferes with the dogbone.
How far above the lifter bore does the non-machined area extend upward

[shermanator2]

Originally Posted by Singleton

There seems to be a fundamental misunderstanding concerning the different cams and the effect on these oem lifters.
These oem roller lifters will rise out of the lifter bores the same amount, (+- .010), regardless of camshaft used.
The larger lift cams have a smaller base circle, so that the lifters starting point is lower in the bore.
The lifter stopping point at its highest will be the same regardless of which camshaft is used, mild or wild.

Thank you, thank you, thank you. I have been trying to say this on three different threads about this subject, but some, including significant contributors, have not seemed to get it.

The instructions from Conp Cams that someone quoted on one of the threads that said in essence if your lifters stick out too much, buy a different cam from us did not help. That is just plain silly. I do not know if those instructions came from the Ford kit or what, but it would be silly there too. If you can install the cam into the tunnel, the lobes are not too tall.

[pmd400]

The vast majority of lifters available for the roller cam sbc and iron dukes seem to use the latter ls7 type lifter. I wonder how long it will be before sealed power drop the 2148 lifter.

[P@blo]

Originally Posted by pmd400

The vast majority of lifters available for the roller cam sbc and iron dukes seem to use the latter ls7 type lifter. I wonder how long it will be before sealed power drop the 2148 lifter.

They can make more. About as rare as salt.

[shermanator2]

Originally Posted by pmd400

The vast majority of lifters available for the roller cam sbc and iron dukes seem to use the latter ls7 type lifter. I wonder how long it will be before sealed power drop the 2148 lifter.

Sealed Power lists the 2148 as the replacement lifter for hundreds and hundreds of applications from 1984 to 2018. Not only for the Iron Duke and apparently all roller littered traditional SBCs, but also for things like the modern GTOs and LS7 'vettes. It seems like this would be one of their most popular lifters and unlikely to be canceled unless they want to get out of the lifter business.

Did you pull the Delphi lifter that you measured out of an actual factory built LS7? Or where did it come from? Do you know the Delphi or GM part number?