Hmmm

Mushroom tappet cam?

Roller Cam

Doesn't look anything like the lobes on my mushroom cam...

Is that a flat-tappet lobe that has worn almost completely round?

Fuel pump lobe?

That looks a lot like a 1988 era NHRA legal stocker lobe camshaft lobe to me

I agree, roller cam.

You Win!

It's fun to put a dial indicator on the valve retainer and watch the valve slam open and the dial spins like crazy and then shut with square lobes like that. I used to run a .440" lift 284 deg solid roller in a motor and was interesting to check the valve lift like that.

I was always told these things idle at like 1500+ rpm and sound absolutely nasty. Anyone have a video clip of one? Don't think I've ever actually heard one of these things before.

It going in a non stock build just to play with while I work on my stroker. So it should be fun. As for sound they kinda sound like a inline 6 with a stuck throttle or like a 2 stroke motor cycle at 7k. At least to me.

Since they tried to more or less make a hydro lifter into a solid on these I might run a solid lifter as the ones ive got are lighter and ive also a set of schubecks. Or might just go by the cams paperwork and run a hydro, ive good valves and rockers, ect. I will fire it this winter and run it n the spring I will post a vid.

Here is an old vid of one in a old truck 454, they sound alot meaner in a 3.31 stroke motor. Not alot of info on the old cheater cams on the web, I found this link on speed talk were some were debating them.

https://www.youtube.com/watch?v=Ny9tperwT6o

A long time ago a friend had a roller camshaft of unknown origin that everyone just called the "Square Cam". It ran better than anything else he ever tried in the car and tore the hell out of everything in the process.

I help a couple who raced a 1971 Challenger 340 Tthermoquad in NHRA F&ES/A, I built and dyno tested a new motor for them and freshen their original motor. I tested three different camshafts in their original motor and found that the two Isky round nose Stocker cams, one ground on 107LSA and the other ground on 105 LSA made more peak power than the Lunati pointed nose (conventional looking lobe) stocker cam I ended up using in their best race motor. The 105 LSA Isky cam installed with 5 degrees advance made 430 HP at 5900 RPM but the HP graph looked like a inverted V with it being very peaky. The Isky 107 made 420 advance with the same peaky looking graph. The Lunati made 420 HP at 5800 RPM but it made 400 HP at 5000 RPM and made 400 HP at 7000 RPM also , it had a very flat HP curve so I left it in the motor and when Linda made her first pass with that motor she jumped out of the car after the first run ands ask me what did you do to my car, it has never pulled like it just did, it had ran 3 MPH faster than it had run on its best run before She would normally shift it at 6400 RPM to get the best ET and MPH with the Isky 105 cam, after changing her shift points to 7000 RPM the car picked up both ET and MPH
Testing pays off

To me they sound just like what you’d expect them to sound like for whatever the seat-to-seat, lsa, overlap specs are.

I don’t know what those numbers would be for the OP’s cam....... but some of those old Stocker grinds have quite a bit of duration.

The first one we got for my friends Pontiac was 258/272@.050, 108lsa.

Another one we tried was 260/260-104.

Having run 340 NHRA Stockers from 71 always a stick shift. I have run Crane,Crower, Cam Dynamics, Isky and Comp cams. I had the first HC 340 Stocker to hold the record in the 11's and the 10's I also had the the first LC 340 to hold the record in the 11's and 10's. When Cam Dynamics gave me one of their first Stocker cams I went from shifting at 7000 to 7500 and we went a bunch quicker. The current special comp grind on an all out kill run has been to 8000. I have run a Stocker grind on the street it has no bottom end but sounds killer nasty. I have a video of my current 6 pack engine on the run stand but it won't let me post it here.

Those old 750 lift 332 duration big block cams we ran 40 years ago had some crazy lobes. I still have two of them on my shelf. We didn’t run half the spring pressure guys are running today.

Is that the old R286 roller (286@.050, .750 lift)? I seem to remember the seat-to-seat was 332 or close to it...

The DC catalog had a pic of the cheater cam (.473 lift but 352/380 seat duration) and those lobes looked just about square.

One of the car mags had one lying around and tried it in a 340 or a 360... wouldn't idle below 1800.

Yep the ones I have are the old R286 cams. I ran 9.80’s with them in my Duster with a stock crank, stock rods, and TRW pistons back in the early 1980’s