OK, Here goes,

I got the cam a couple of weeks ago and started the install this morning. It's a 276/284 Solid (402A3LUN - S/N U1MT). The specs on the website say the Cam is 110ºLSA and 104ºICL. That's what I was expecting. Looked hard at the CAM card for the first time and see it says 110ºLSA and 106ºICL. :(

That would mean it only has 4º advance ground in right? I understood this CAM as well as most UD grinds run best at 6º advance. That's what is on the Web as the spec. So I guess my question is, what happened? :confused:

I checked the card by degreeing the CAM and it comes in at 106º like the card says. Why did this CAM come this way and what should I do?

I'm sorry if I sound a little ticked - I wanted to get this motor buttoned up today and now I'm stuck without any way to advance this cam 2º more. I've thought about using the eccentric CAM gear bushings but I don't think I can get them locally. I'm not really sure that is what I should do anyway. Harold or others- please advise.

Thanks,

Troy.

I believe that most Lunati/Comp,UD are ground on a 106 intake centerline, all you need to do is advance it another 2 degrees and all should be well.
Why can't you advance it another 2 Degrees? :confused:

Jeremy,

I edited the post because I thought that might be asked. I can't advance it 2º because I don't have the proper bushings and don't think the local Discount or Autozone will carry them. I'm going to call both to see.

BTW, I think that all of Harold's grinds were ground 6º advanced which would be 104º ICL and in fact 104º ICL is what the website has posted.

Harold - need your input here. Tell me what I should do. :confused:

Troy.

Originally posted by Troy70SS:
Jeremy,

I edited the post because I thought that might be asked. I can't advance it 2º because I don't have the proper bushings and don't think the local Discount or Autozone will carry them. I'm going to call both to see.

BTW, I think that all of Harold's grinds were ground 6º advanced which would be 104º ICL and in fact 104º ICL is what the website has posted.

Harold - need your input here. Tell me what I should do. :confused:

Troy. From what I understood harold cores are delivered 2 degress advanced. All you have to do is advance it to another 4 to get 6.

For example on my cam card it reads:
LObe Separation: 110
Degree intake lobe to: 104

So, what my engine builder did was degree the cam in so it was six advanced.

It is not an install straight up deal. Get a good timimg set and you can do it yourself (i.e. if it is 2 degrees straight up add another 4)

My understaing is, Ultradyne used blanks with the pin at 2º advanced so installing them using the +4 mark on the timing set put them at 6º. Lunati (Holley) uses cams blanks with a +4º pin location. This means that for +6º, as Harold's cams like, you have to use a +2º bushing and install using the "0º" timing set mark. I don't think Harold has any control over this.

Pat's correct! graemlins/thumbsup.gif
I had to use a 2* bushing to get my UDHarold designed Lunati cam, which was ground on a 110* LSA, actually installed at 105*.

Thanks Guys,

I was fraid that the bushing thing was the only way out. I wish I had been aware of it beforehand and I could have picked up the bushing saturday when I was at the speed shop. Oh well, there's always next weekend.

Harold - if you do happen to drop in here. The Cam card does say 106º ICL - Is this where you intend it to be or do you recommend the 104º ICL installation?

Thanks again,

Troy.

When I wrote the info that appears on the website, I put everything 6° advanced because that is where my cam designs have run the best. The difference between 6° advanced and 4° advanced is typically about 5 BHP, but SOME individual engines liked 4° advance more---variation was in their individual cylinder heads.
Lunati seems to grind ALL their cams 4° advanced---This was not discussed with me in any way. Same thing with the spec cards---The spec card program was written by their old cam designer, and he puts all the numbers as SYMMETRICAL cams... He is now the designer for Bullet Cams.
Holley has hired a programming company to write a number of programs for Lunati. I hope to get them to look at these problems.
Your cam will run just fine on 106° ICL, and probably slightly better on 104° ICL. You may not be able to tell much difference between the two.....

UDHarold

Originally posted by UDHarold:
advanced is typically about 5 BHP, but SOME individual engines liked 4° advance more---variation was in their individual cylinder heads.
Your cam will run just fine on 106° ICL, and probably slightly better on 104° ICL. You may not be able to tell much difference between the two.....
UDHarold Hopefully I do not sound too thick but I want to verify probably the obvious to most people: First, using the 0 on a Cloyes (+4 / 0 / -4) timing chain will put the cam in 4 degrees advanced, right? And second, will putting the cam in 4 degrees advanced, in lieu of the recommended 6 degrees take a little away from the lower end torque or is it negligible? Thx

I bet the power band/rpm range wouldn't shift more than 200 rpms toward the top end if you install it without the extra 2 degrees advance. Nothing you would actually feel I bet.

Thanks to all,

I think I'll go ahead and put in the 2º bushing at this point. It's less than $5 and I already missed getting everything complete this past weekend anyway.

Thanks again to all that replied. Especially Harold - I hope you know how much you are appreciated on this site. Can't wait to hear the "crackle" of this cam! :D

Troy