68thumper

I love my solid lifter cam. The engine runs perfect but I want to eliminate the worry of a solid lifter failure. I am wondering if I could swap out the solid rollers with a set of hydraulic rollers. I understand the cam profile of a solid cam is different than a hydraulic but my cam is custom ground and installed by the previous owner so I don't know what I have...thanks.

cv67

Some guys do it but know it wont run the same no more revving it to the moon.

Gordonm

No. The so
I'd flat tapped cams are ground on a taper. The lobes are ground this way and the rollers will not work on the face so a flat tapped cam. The profiles are totally different also. You will most likely ruin the cam and lifters very quickly.

wcsinx

The roller won't sit square on the lobe.

gkull

You two guys are killing me with not reading what the poster ask!

I ran solid r's on a h-roller cam after talking to somebody at Comp Cams that knew something.

I would say yes if it is a common street type solid roller. You would almost have to look at the lobes to verify that the lobe lift rate was not super agressive. You can also run a dial indicator on the pushrod side of your rocker and compare the .050, .100 and .200 duration numbers to lobes in the comp cams lobe profile book and see exactly what it is.

The second thing is you will need to change your springs to something around 145# closed. Which are used in the most aggressive H-roller lobe designs

These are my two billet cams. The one on the left if you look at the lobe is a street type solid roller. The cam on the right is a billet with racing lobes where you keep the valve open for a long time. It would destroy a H-roller lifter. See how big the end of the lobe is?

wcsinx

He said two different things. He started off with "solid lifter" which most guys will interpret as "solid flat tappet lifter". Then he says "solid roller lifter". I'm not 100% convinced the OP knows the difference.

Cstraub69

You can not run roller lifters on a flat tappet lobe profile.

gkull

I can see what you are saying!

Flat solids can last a life time. Things with wheels break down

iokepakai

Running Crower Cool-face solid lifters with the EDM oiling port.This feature increases lubrication to the cam lobes.No lash changes since install,4k miles on the cam and lifters.Don't think I would replace just the lifters on a cam that has been run.Recommend new cam with new lifters.This being my first solid lifter cam,I noticed right away the engine seems to rev quicker & sounds great....Pic of the lifters....
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Want to avoid this!
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Using this oil, formulated for flat tappet engines:
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reno stallion

You can run solid lifters on a hydraulic cam even solid rollers. But not the other way

7T1vette

Thank you for that. This is an 8 year old thread, so we had forgotten completely about it....

7t9l82

If you were to try to use a roller lifter of either type on a flat tappet cam of either type it would kill the power of the engine anyway regardless of the fact bad things would happen.
A flat tappet cam contacts the lobe closer to the edge of the lifter bore than a roller.
That's why a flat tappet cam with identical specs will make more power regardless of how steep the ramp is.

7t9l82

That's not to say a roller doesn't end up being a better way to go.

vettebuyer6369

You are responding to a thread from 2012.