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Old 06-19-2015, 06:13 PM   #1
1934calkid
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Default Potvin 3/8 cam ?

has anybody ever run this camshaft ?
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Old 06-19-2015, 06:37 PM   #2
Ronnieroadster
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Default Re: Potvin 3/8 cam ?

Great cam I ran one for many years got mine from Dean Moon a long time ago. My flathead was supercharged using a 671 GMC blower and two holley 600 CFM carbs. Ran that combination until I went to an ARDUN conversion. Oh and my 8BA block was relieved for much better performance all around both on the street and on the track.
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Old 06-19-2015, 06:59 PM   #3
Walt Dupont--Me.
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Default Re: Potvin 3/8 cam ?

Well 1934 calkid, there you go, all you need to is put a million $ in your flathead and you can relieve it, then you can get from one street light to another. You've all ready said it's just a street rod, no drag racing, no salt flat. Your a hard man to tell anything. Walt
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Old 06-19-2015, 08:18 PM   #4
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Default Re: Potvin 3/8 cam ?

I had the 3/8 super in my 36 5W with a 59AB,4" crank.Great on the hwy but idling in town at 15-20 mph drove me crazy.
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Old 06-19-2015, 10:15 PM   #5
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Default Re: Potvin 3/8 cam ?

Fantastic Cam! If you need a really nice one ground, let me know . . . can get 'Pete' to make you a very nice one. He just did two of them for me - his work is exceptional!

Dale
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Old 06-20-2015, 05:13 AM   #6
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Default Re: Potvin 3/8 cam ?

It depends on what you like and want. I have tested this cam in a basically stock displacement engine with 4 barrel and Offy heads. It was a poor overall performer. Poor low speed performance and no better than a Max 1 HP on the top end. If your desire is a salty idle this is a good cam.
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Old 06-20-2015, 06:45 AM   #7
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Default Re: Potvin 3/8 cam ?

As a street cam, The Potvin super 3/8 is what I call a 'Lazy cam', weak lower & mid range performance.
This was in a 276 c i 8BA with all the usual stuff.
Installed an Isky 400jr that woke up the 'Lazy' flathead, decent low end & great mid range.
The Potvin is a waste on the street, unless you just want to listen to the idle.
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Old 06-20-2015, 07:12 AM   #8
Tim Ayers
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Default Re: Potvin 3/8 cam ?

Man, how can the opinions on one thing swing so much. I know a lot more goes into making an engine than a cam, but one guys great is another guys junk.
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Old 06-20-2015, 01:15 PM   #9
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Default Re: Potvin 3/8 cam ?

Here is an AV8 with a 276 cubic inch motor that I helped Chris Daniels build - you'll probably like the sound of the Potvin 3/8. I've driven this car and it runs really nicely!

https://www.youtube.com/watch?v=9akeT4Ua9lU
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Old 06-21-2015, 07:39 AM   #10
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Default Re: Potvin 3/8 cam ?

Quote:
Originally Posted by Tim Ayers View Post
Man, how can the opinions on one thing swing so much. I know a lot more goes into making an engine than a cam, but one guys great is another guys junk.
Now isn't this the truth! That is why one needs to form their own opinion in the end - as there are no shortages of opinions and perspectives on these old engines. One thing I've found is that how the cam is installed/timed can make a huge difference. Sometimes I'll find a certain cam is advanced, another one of the same make/model . . . a bit retarded, etc..

Certain combinations seem to run for one guy . . . and not for another. One truly never really knows the details of the complete 'package', how it was put together and how it was tuned.

Guess this is why one needs to have a bunch of flathead cams - so you can try em' all!

Last edited by Bored&Stroked; 06-22-2015 at 06:08 AM.
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Old 06-21-2015, 08:55 AM   #11
Ol' Ron
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Default Re: Potvin 3/8 cam ?

Before I became a suporter of the L-100 cam, I had run quite a fer cams in both a racing and street environment. At first look at the timing numbers I told the customer that the cam was to hot for a street engine.. He said he was told it would work just fine, so I installed it in a 276 block with Kong heads (7:1CR) a single 94 carb and with less than 10 miles on the engine headed for York Pa. The preformance of that engine in a 5500 lb ambulance on the street was fantastic, and the sound was perfect. When we opened the hood and people saw the engine for the first time, they were disapointed, thinking it shuld have been a HEMI. Today, I have no idea why this cam runs as well as it does. The numbers on the card tell me it shouldn't. I've installed dozens of them and nobodys ever asked me to remove them. So I guess you just have to try a bunch of them and pick the one that suite you best,
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Old 06-24-2015, 01:25 PM   #12
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Default Re: Potvin 3/8 cam ?

I have one in a 50 mercury overdrive car and it has amazing low mid range power I shift at 5500 rpms
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Old 01-07-2016, 11:13 AM   #13
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Default Re: Potvin 3/8 cam ?

I have one in my 255 french flathead,2 holley94 on weiand intake and mid porting job,i love this cam ...engine sounds killer and has the right power....

Last edited by rodderbilly; 02-26-2016 at 01:45 PM.
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Old 01-08-2016, 08:22 AM   #14
Bored&Stroked
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Default Re: Potvin 3/8 cam ?

One man's beer is another man's poison! Good to see that a lot of guys like this cam - cause I sure do!
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Old 01-08-2016, 05:10 PM   #15
jetmek
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Default Re: Potvin 3/8 cam ?

+1 for Potvin cams
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Old 01-08-2016, 05:16 PM   #16
Tim Ayers
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Default Re: Potvin 3/8 cam ?

Quote:
Originally Posted by jetmek View Post
+1 for Potvin cams
I had the pleasure of talking with Bill Jenks before he passed. The guy forgot more than I'll ever know. He loved the 3/8ths. I was a bit surprised when I told him other grinders were copying it.

He got all pissed off and said it won't be the same as mine. Glad I still have that one the Bill ground for me.
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Old 01-08-2016, 05:23 PM   #17
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Default Re: Potvin 3/8 cam ?

The 3/8 Potvin grind was designed for 276 ci or larger engines.
It has 280 degrees of duration and a fairly high lift rate. It is obviously going to be a "lazy" or a poor performer in a near stock street engine.
It is a race grind. It is going to lope along at 20 mph on the street with normal street gears. Get used to it. Drive faster. Have more fun.
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Old 01-08-2016, 05:27 PM   #18
Pete
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Default Re: Potvin 3/8 cam ?

"He got all pissed off and said it won't be the same as mine. Glad I still have that one the Bill ground for me."

Rest assured Tim, they are the same, just like every Ford engine of the same model that comes off the assembly line is the same.
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Old 01-08-2016, 07:25 PM   #19
Bored&Stroked
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Default Re: Potvin 3/8 cam ?

Truth be told . . . I have an original Potvin 3/8 and a Potvin 425 . . . and I also have Pete's variants - no question who ground a better and more consistent profile. Guess Who???
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Old 01-08-2016, 08:08 PM   #20
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Default Re: Potvin 3/8 cam ?

I have this cam in my 296" blown flathead running about 5 lbs boost. It pulls like a freight train from idle on up and I run this engine to 6000 rpm on occasion. Not sure about this cam on a unblown flathead.
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