Cam my 416

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Ought to hit your HP goals with that setup and a good tune.

425-450 is easily attainable.
 
Foomaster said:
crackedback:finga:
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No I did not. It was a decision we made to go comp cam 2 days ago, but I panicked about using the right cam and came to FABO for your opinions. My machinist is a very respectable guy and has awesome reviews from many people. With that said, he has never assembled a 416 stroker.
 
I think the first cam was the better choice. Given this is a street engine, you want bottom end torque. The first cam would have made more.
 
RustyRatRod said:
I think the first cam was the better choice. Given this is a street engine, you want bottom end torque. The first cam would have made more.
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So you've run the Lunati or your just guessing..i have used it..PLENTY of lowend torque..
 
No I haven't run either.

I still cannot get out of my mind that he did not have the first cam. Even though he said he didn't. It got stuck in my mind somehow that he did.

I did run them both through desktop dyno on a mild 416 and the Lunati made enough of a power difference to pick it.......but again if he had the other one, I would have said run it. But he doesn't.
 
I have never seen a 4" crank motor that was soft on bottom, even with big cams.
 
Question. Why do they have a advertised duration which is usually higher the what the actual specs may say?
 
Good question. The advertised duration IMO is useless as tits on a bull. Duration at .050 is a standard point of reference.
 
Foomaster said:
Question. Why do they have a advertised duration which is usually higher the what the actual specs may say?
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It is measured from a lower lift point. Some measure at .004" lift, some at .006. This is why the .050" duration method came into play. It seems to make an level playing field regarding camshaft choices.

The advertised figure still has worth, IMO for comparing between the two on different camshafts.
 
roccodart440 said:
Good question. The advertised duration IMO is useless as tits on a bull. Duration at .050 is a standard point of reference.
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For most camshafts, that's true. For the old MP camshafts though, you could not make the .050" comparison with another brand camshaft. They measured theirs a different way.

Nowadays, I don't know where the heck they're measured from. They are all over the map due to poor production tolerances.

I think back when they were actually "good quality" that they were hard to map, because Mopar wanted to keep them proprietary. I have had some map right and then some smaller and some bigger than advertised. Sometimes by a good margin.
 
The .050" lift duration number is a way to standardize cam specs. IMO the duration numbers.004" or .006" lift are useless.
 
justinp61 said:
The .050" lift duration number is a way to standardize cam specs. IMO the duration numbers.004" or .006" lift are useless.
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Then you should read more about camshafts. Comparing the advertised to .050" from one cam to another can give you a good idea about how much different one really is than the other.
 
RustyRatRod said:
Then you should read more about camshafts. Comparing the advertised to .050" from one cam to another can give you a good idea about how much different one really is than the other.
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Is this something one of your computer programs told you or learned from application?

I looked at the cam cards from the last three cams I bought, two Hughes Engines and a Comp solid roller. None of the three show an advertised duration any lower than .020". The Comp shows it at .020" and .050", their lobe chart shows it at .020", .050" and .200". Again nothing at .004" or .006". Call Dave Hughes and ask for the duration at .006" on his cams and see what his reaction is. He will give you the .200 numbers though.

Basically the numbers at .004-6" only tell you when the valve starts to open, not really much useful information there.

Maybe you should call the cam companies and inform them of the error of their ways. Until Dwayne Porter, Brett Miller or Dave Hughes tell me to use anything else I'll keep using .050" and .200" for my comparison.
 
I have my short block 416 and a Lunati solid roller on order 570 lift.

My eye is on the Edlebrock heads, but what rocker arm assy did everyone run?

Jeff
 
justinp61 said:
Is this something one of your computer programs told you or learned from application?

I looked at the cam cards from the last three cams I bought, two Hughes Engines and a Comp solid roller. None of the three show an advertised duration any lower than .020". The Comp shows it at .020" and .050", their lobe chart shows it at .020", .050" and .200". Again nothing at .004" or .006". Call Dave Hughes and ask for the duration at .006" on his cams and see what his reaction is. He will give you the .200 numbers though.

Basically the numbers at .004-6" only tell you when the valve starts to open, not really much useful information there.

Maybe you should call the cam companies and inform them of the error of their ways. Until Dwayne Porter, Brett Miller or Dave Hughes tell me to use anything else I'll keep using .050" and .200" for my comparison.
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Ok.
 
.050 lift measurements get rid of the take up ramps and lash amounts. I use .050, but more important to me is comparing the .050 and .200" durations if I'm comparing lobes. Lobe shapes are not triangles, each ramp is an arc. You can't tell how that arc is shaped unless you have more than two points to plot.
 
Lancair said:
I have my short block 416 and a Lunati solid roller on order 570 lift.

My eye is on the Edlebrock heads, but what rocker arm assy did everyone run?

Jeff
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Comp pro magnums on my Edelbrocks..
 
moper said:
.050 lift measurements get rid of the take up ramps and lash amounts. I use .050, but more important to me is comparing the .050 and .200" durations if I'm comparing lobes. Lobe shapes are not triangles, each ramp is an arc. You can't tell how that arc is shaped unless you have more than two points to plot.
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If you see 2 cams with the same duration at .050 and different durations at .020. The one with more at .020 has a more aggressive lobe/ramp
 
justinp61 said:
Is this something one of your computer programs told you or learned from application?

I looked at the cam cards from the last three cams I bought, two Hughes Engines and a Comp solid roller. None of the three show an advertised duration any lower than .020". The Comp shows it at .020" and .050", their lobe chart shows it at .020", .050" and .200". Again nothing at .004" or .006". Call Dave Hughes and ask for the duration at .006" on his cams and see what his reaction is. He will give you the .200 numbers though.

Basically the numbers at .004-6" only tell you when the valve starts to open, not really much useful information there.

Maybe you should call the cam companies and inform them of the error of their ways. Until Dwayne Porter, Brett Miller or Dave Hughes tell me to use anything else I'll keep using .050" and .200" for my comparison.
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Comp Cams lists the rated (advertised) duration for their hydraulic cams at .006" and for the solid tappets at .015" and .020". It depends upon the cam maker and the cam design.

Here is an example:

http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=712&sb=0
 
justinp61 said:
I have never seen a 4" crank motor that was soft on bottom, even with big cams.
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Truth. I'm at 500ft/lbs by 4000rpm. 255/263 @ .050" and .643lift on both. Solid roller. Pulls to 7000rpm.

To the OP, you'll be happy with your choice. Definitely get the heads checked out. If you're an auto car I would be looking at a converter that will stall to 3k, will make launches more fun and not slip enough to annoy you out cruising.
 
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