Replacement 68 340 four speed cams

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Ancient thread but here goes...

Camshaft Machine Corp in Michigan is one of the largest suppliers of cam cores in the world and they supply cores to virtually every aftermarket grinder in America (plus every OEM). Look for the CMC cast into your core.

Regrinding takes material off more material off of the heel of the lobe than the top of the lobe to gain lift.

David Vizard uses his "128" cam program to choose a cam. He is on youtube.

A lopey idle by itself is a poor way to choose a cam.
 
I'm still trying to get enough interest generated to get the masters made off of my blueprints and a original. I may just have masters made and go from there.
 
FWDLK Frank said:
I'm still trying to get enough interest generated to get the masters made off of my blueprints and a original. I may just have masters made and go from there.
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I like the idea of getting the "Masters" made and go from there.

Let me know if there is something I can do to help.

Thanks for your efforts.

George Jets

☆☆☆☆☆
 
4spdragtop said:
I'm "cam"inally challenged, so to speak/slur. These were one of the "best " sb factory mopar cams correct? My 340 build will have oem 273 adjustable rockers and I would like to go solid flat tappet.
By doing this, how(if any) will this alter the cams "performance"? Will the cam specs need changing to a solid?
Thanks
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Back in the day, this WAS a pretty good factory cam.
But, IMO, Today, for street performance, you can do better; unless yur just after the sound, but then you would also need the 340 exhaust.
 
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FWDLK Frank said:
I'm still trying to get enough interest generated to get the masters made off of my blueprints and a original. I may just have masters made and go from there.
Click to expand...
I don't think it would be too hard today to have them made up. Too bad my EX son-in-law works in a cnc shop, but like I said my X son-in-law.
They were a great cam, lots of rpm.
 
The factory was limited with cam choice with annoying things.....like emission requirements, vacuum, idle quality, restrictive [ quite ] exh system etc.
These restraints are not applicable for the hot rodder, so a factory cam is most unlikely to be the best choice. Sure, it will 'work', but a better performing cam will cost the same.....
 
The wide LSA isn't necessarily a bad thing. It allows for a high vacuum signal to operate accessories like power brakes, gives decent street manners and also a much more flat torque curve and usually a good bump in bottom end torque compared to a tight LSA like 108 for instance, which would have a more peaky torque curve at the expense of some bottom end torque. It's not a bad thing, it's just different.
 
As long as any cam you buy gives the same exhaust note would be ok!
 
As I went thru this thread again lots of folks say there is better stuff out there but I owned a 68 F/S 4 speed car. All stock except the carb. and that son of a gun just would rpm all day long even in high gear. I've used this cam a lot thru the years and no one ever complained but I got a lot of thumbs up from my customers.
 
LO23M8B......Thank you for your post, im having one ground now from Oregon Cam... makes me feel better about my decision.
 
TRW used to make copies of them long time ago. I think I used to get them for $30.00 or so. Maybe $20.00 for a set of lifters. I used to zero lash them also. There sure has been a lot of good technical advances in all these years but you still can't beat the good old days.
 
FWDLK Frank said:
Not throwing the candy on the ground, just saving it for myself/later time. When I posted a wanted ad this cam a year ago... [WANTED] - 68 340 4 speed Cam
There was quite a bit of response and then a debate of whether or not the Oregon cam was 100% correct or not to the point where a moderator had to get control of the thread and delete the commentary. So, since I didn't find what I wanted on fabo, I decided to keep looking. I happen to know a retired Chrysler engineer and when I spoke with him about it, he contacted his fellow retired engineers. It just so happened one of his friends was in small blocks and he had this cam, another engineer had the blue prints. Both of them were very humble and sold me what I now have for a reasonable price... initial investment. Jim at Racer Brown is a friend of mine and we discussed making a run of these. To do an exact copy, masters need to be made and there's a cost associated with that. If Jim knew with certainly that he'd sell 50-100 or so of these in a short time I'm sure the cost of the masters could be written off...but I'm not going to put a friend's money on the line for an uncertain venture. This is why I said I would front the money for the masters, not to mention my original investment for the cam/blueprints. All I was asking for is a list of committed buyers. If I seen the list was 50-100 strong and all of the members had good feedback/integrity, perhaps the price could be lowered, but again, I'm taking the risk. If close enough is good enough for everyone, so be it, enjoy what's close enough for the price you want. I'm not going to debate specs/knock another cam manufacturer/speak poorly of anyone's manufacturing processes, that's for the purchaser to decide. More often than not in this hobby, making replacement or reproduction parts is not worth the time unless you are a well established company with a shop full of equipment. My goal was to take care of a want that I had. I thought with my find maybe others would want the same and perhaps over time, I would possibly break even. From the responses I read, it would appear the majority is happy with what's available so this is not a venture worth my efforts. I'm also not going to put a friendship with Jim on the line if no one is interested. Jim has a well established company but you all need to understand, for the most part, he's basically a one man operation and works literally every day to keep up with orders. Since there is no interest, the cam and the blueprints will sit on a shelf in my garage...maybe someday there will be enough interest to make it worthwhile. I digress.
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I think with a tighter LSA, say maybe 106-108, and more lift, at least like perhaps what Lunati had: .450” & .475” would be more appealing. At 110 LSA & those lifts you are closing in on the famous Comp Cams XE-268.

Hidden Nostalgia versus customer’s performance desires would be poor bet when no one can ‘see’ your stock camshaft even with the hood open.

You might have more interest, despite deviating from the original. As Rumblefish has said many times, there are better, more modern grinds out there. But who knows, with good camshaft availability drying up the changes I recommended might peak more interest.

In years past, getting 20 people ‘fairly’ committed would have been do-able, but now, in this economy, doubtful.
 
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