Measuring mystery cam lift with mic for budget rebuild.

[gliderider06]

So, I'm putting together a budget rebuild 318 with parts I have in the garage and i have 2 stock 360 cams that I pulled from engines I rebuilt. One of the cams I measured ( lobe lift- base circle x 1.5) was .410 both intake and exhaust. This cam was from 78 motor home. 2nd cam from a 75 cop car, measured the same way was .421in .435ex. Any possibility of that cam being a 340 ish grind? I know it's not exact measurements, but I am only trying to get close.
This rebuild, so far has only cost me about 40.00. Previously rebuilt motor I am refreshing with rings, bearings, heads intake, everything with stuff I have acquired throughout the years. Hope to get my Duster running by the end of the year.

 

[mderoy340]

Crude way to see difference in duration is to lay both cams side by side cam key at 0*. .410 lift OEM is 252* duration. The other cam if 340ish would have at least 10* more and be easy to eye ball.

 

[Abodybomber]

the 1968 340 manual numbers I posted are cam 2899205 from how to hotrod small block mopar by Larry Shepard. the 1968 auto cam is the same as all 1969-73 340s, 2899206 268*/276* and .430"/.444". Comp Cams can do 276*/284* and .464"/.474" and more, and I know there are smaller cam companies that can do an exact replica, not sure who
From Marco hotrod .....

 

[AJ/FormS]

IMO, 421/435 is too far off to be even a worn out 340 stick..
The 410/410 is a 360 2bbl cam. IIRC that is a 252/260/111 cam with 34* overlap; works good in a 318LA with the 360 springs;
And shaved heads.
Or with just a 2800TC,
or both.
Or could just use closed chamber heads. But super with the 2800TC.
That 2800 makes a sweet 318LA no matter what,lol.

 

[Abodybomber]

IMO, 421/435 is too far off to be even a worn out 340 stick..
The 410/410 is a 360 2bbl cam. IIRC that is a 252/260/111 cam with 34* overlap; works good in a 318LA with the 360 springs;
And shaved heads.
Or with just a 2800TC,
or both.
Or could just use closed chamber heads. But super with the 2800TC.
That 2800 makes a sweet 318LA no matter what,lol.

Agreement ...
Always the basic 268 H Comp grind..
You adding that torque converter input ,makes it a 2500-5800 pull machine, with a emphasis on mid range torque. A damn good cam.

 

[gliderider06]

Thanks guys. I did use the 421/435ish cam. I do know it's not exact numbers, but ballpark. Both cams had similar lift, but base circle was smaller on the one. My thought, since it was a cop car motor, that it had a different cam installed because of that. I pulled them both out of unmolested engines, so I'm sure that it is factory. I will have to look and see if I can read the part number on the cam, since I did already install it and buttoned up the lower end. Everything that I have used so far is from parts gathered throughout the years. It has been great to go into the house and say I've put new rings, bearings, oil pump and gasgets that was on the shelf. I'm even going to use the high stall converter that was behind the motor that cam was in, minus the butterfly.
My main goal is to clean up the garage some and make the duster mobile again until I get around to the 340 for the car, or 360 magnum I have for it.
Thanks, Paul