I'm getting ready to build 2 engines and I dont know anything about cam sizes really. The first engine will be .060 over bore 110 thousandths shaved over the head with over sized valves it is for isiah in the funny truck probably want to shift between 5500 and 6000 and will be naturally aspirated engine. I called the cam company today and they also ask what I wanted the cam to be at 50 thousands which meant absolutely nothing to me. The guy that has always helped me choose cams isn't very helpful anymore for whatever reason. Can someone tell me what a good cam grind would be and what the 50 thousands means to get the most out of this engine? Thanks all in advance.
The other engine will be quite a bit bigger not sure exactly where I'm going with it yet will have to ask about it when I decide.

What I am thinking right now on the second engine is .100 over the head would be cut 0 on one side to 200 on the other side which gives about 235 compression bigger valves would be in the half hemi so 2800 pound with driver 456 rear end gears same question what would be a good cam to get the most out of it with shifting around 6000 rpm. Feel silly having to ask this but I'm clueless when it comes to cams how to even begin to get the right one. Thanks in advance again

Hi Lukus,

Happy to help. I assume you are starting with blocks that are uncut (no milled deck)? Looks like you'll be at around 9.5 or a bit above on the first motor. I assume you'll want to use pump premium gas. I have used Oregon Cams and I ship them used cams to regrind. Never had trouble with oil pump gear failure or cam wear. I recommend their "346" grind for that motor, which has the following specs: 0.480" lift, 262 degrees "advertised" intake duration, 252 degrees intake duration, 106 deg lobe separation angle. You should "degree" or "install" this cam at 100 deg centerline.

The cam guys were asking about "duration at 0.050" (fifty thousandths of an inch) valve lift". This cam has 234 degrees at 0.050" on the intake and 228 degrees at 0.050" on the exhaust. These are better numbers to pick a cam than the "advertised" duration numbers.

I'll work on a cam for the bigger motor. If you have old junk cams, you can ship a few to Oregon and they can grind you fresh profiles...

Hope this helps!

Lou

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Home of Slant6-powered fun machines since 1988

Thanks Lou. Oregon cams is who I spoke to on the phone and we talked about the used cams being foreground. I was surprised to learn that they could so that and that they were as cheap as they are. I will get that cam for isiahs motor just let me know what you come up with on the other one and thanks again.
Lukus

One more question for you Lou I am putting together a motor for the dart right now it's almost ready to go in the car it's very similar to isiahs motor .030 over 110 off the head. Big valves I'm using a cam I had it's the "six pack cam" 290 duration 300 lift. I'm being told it's way to big and will slow the car down 4 tenths what are your thoughts on that?
Thanks again for the help.
Lukus

Hi Lukus,

Sounds good.

Can you give me more specs or info on the "six pack" cam? 300 lift does not make sense. Can you find the duration at 0.050" valve lift? You could always just order a second one of the Oregon 346 cam for that motor.

Are you going to cut the block on the hotter motor, or do you have a deck height (piston at TDC) measurement? If you are going to have 235 psi cranking pressure, then you will want a really big cam. Race gas, I assume?

Lou

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Home of Slant6-powered fun machines since 1988

I thought it might mean .300.lobe lift or .450" @ the valve. Just a guess.

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Yes, possible, but that would be a weirdly low lift with such a long duration.

It could be the hyperpak cam?? That had something like 290 duration and 0.460" lift. That would work well with your motor combo for the Dart, Lukus.

Lou

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Home of Slant6-powered fun machines since 1988

The block will be standard deck height. I'm saying around 235 cranking compression because that's what dads motor had before with the head shaved that same way. Yes it will be race fuel.

With the dart I really dont have any info on that cam it was bought from Barry Harrison by larry was ran in the dart some with that worn out motor that Larry was running. Those numbers are what was stamped on the crank when I took it out it was stamped 290 300 I know that sounds weird. It's all the info I really have on it though what I'm told is that it was called a "six pack grind" and Barry had some made up and sold years ago. Dont want to put names on here but one particular person is telling me that I'm messing up using it and slowing the car way down he says it will never work right or run right. For the moment though I really have no choice but to use it if I'm going to mokan which I'm going as long as the car runs. Was just trying to figure out if what I was being told was anything close to right or if he was just wanting to argue about something.

I was already thinking that just ordering a second cam when I get isiahs would be a good idea for the dart if that's true about this one. But wouldn't be able to do that before mokan. If we could somehow get ahold of Barry I think he would probably know what this one is.

I seem to remember someone having a camshaft for sale some time ago. It was a cam like the one that Barry had for his "Six Pack car". Probably a pretty big cam? Maybe for nitrous?

Could the 290 and 300 be the intake and exhaust durations?

Just thinking out loud

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Ah, if so that would be a big cam. His car is called Six Pak... Might work well in your hotter motor, Lukus.

Lou

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Home of Slant6-powered fun machines since 1988

Possibly I'm not sure what it is I'm thinking probably just swap it out a little later and just get new ones for all these motors since I really dont know what it is. I want the hot motor to run the best it can so like to have the best combination I can for it. Not sure if I will get it done this season or not I'm planning to but definitely going to get isiahs done the dart should be running by Friday.

Clifford 95-1212 290/300 adv. duration, 256/262 duration @ .050"lift, lift .566"/.566", 110 LSA.
That came from a chart I gleaned from the forum some time ago.

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― Hunter S. Thompson

That very well could be it I really dont know I just know its stamped 290 300 and from what I'm told it was bought from barry. I'm having trouble with anyone around the shop remembering details about anything lol.