My CompCams Cam Card ECL Question

[bigpoppapreston]

Hello. I ordered and received my camshaft from Comp.

I gave them these specs:
239 intake @ .050
254 exhaust @ .050
114 lobe separation
110 intake centerline
Which should work out to:
ivo 9.5
Ivc 49.5
evo 65
evc 9

However my cam card valve timing @ .050 read:
ivo 9.5
ivc 49.5
evo 64.9
evc 9.1
Which would put the lobe separation at 113.95 instead of 114 degrees Which is stamped on the end of the camshaft.

I haven't installed the cam yet, thus I haven't degreed it.

Why the apparent discrepancy with my specs?

Thanks in advance.

[Monza355]

IF these numbers are accurate we are talking about 0.05° i wouldn’t loose any sleep about it

[Tom68]

Everything has a tolerance.

[BCjohnny]

If the numbers are indeed accurate I'd see it more as confirmation of good QC than some kind of error

If my maths are correct you're talking 1 / 7200 of a circle, or 3 minutes, which is a very small amount and I'd guess well within tolerance

[bigpoppapreston]

On my previous CompCams I just never seen them put the exact precise degrees on my cam cards.

You all are correct in saying that it's in acceptable tolerance and is nothing to worry about.

[Walter R. Malik]

5 minutes ... really?
The width of a line on a degree wheel is more than that.

[Stingr69]

The cam card is odd and precise. I would check that cam with a wheel for sure. I assume it was a custom grind? Close to a Crane F-278-2 solid flat tappet but just a bit more exhaust timing. Cast iron exhaust manifolds maybe?

I have an old Isky cam with rounded up valve timing numbers on the card. I guess it was to avoid decimals in the spec from confusing people, but who knows?

[mt-engines]

5 minutes ... really?
The width of a line on a degree wheel is more than that.

.05 X 60 = 3..... 3 minutes

[Walter R. Malik]

5 minutes ... really?
The width of a line on a degree wheel is more than that.

.05 X 60 = 3..... 3 minutes

So ... even less, LOL.

[mt-engines]

5 minutes ... really?
The width of a line on a degree wheel is more than that.

.05 X 60 = 3..... 3 minutes

So ... even less, LOL.

The tip of the pointer lol

[Roundybout]

That’s pretty close. I wonder if any perceivable difference would be even measurable on a dyno between those two specs. Probably within the margin of error to be even picked up.

[cab0154]

i wonder how close itll be to the card when you degree it.

[Tom68]

just a bit more exhaust timing. Cast iron exhaust manifolds maybe?

Extended high RPM power band normally.

[hoffman900]

That’s pretty close. I wonder if any perceivable difference would be even measurable on a dyno between those two specs. Probably within the margin of error to be even picked up.

I bet actual running duration changes 5-10* from spec’ed just by virtue of system flex.

[Tom Walker]

What you are interpreting as a "discrepancy" I would interpret as excellent quality control and probably have some doubt about its accuracy until I put a degree wheel on it.
That would require a very large diameter wheel that is extremely accurately marked to be able to read that close, also coupled with a high quality cam drive system if cam is installed in an engine.