JimmyDavidson

We ordered a new Iskendarien Camshaft #201027, and started to degree it. We wrote down the numbers of Intake Open/Close and Exhaust Open/Close. We found that the numbers of the Intake Open and Exhaust Close were 4 degrees more than what the camshaft specs were. The Intake Close and Exhaust Close were however correct. The lobe separation was correct too. How would this effect timing, and idle(Engine Specs in signature)?

Camshaft Specs(Isky's Specs)
Duration @ .050-247/247
Lift-.507"
LSA-108
IO:15.5
IC:51.5
EO:51.5
EC:15.5

Camshaft Specs(Actual specs that we got, done several times to make sure they were correct)
Duration @ .050-252/252
Lift-.507"
LSA-108
IO:20.5
IC:51.5
EO:56.5
EC:15.5

It should give me more duration/overlap but I want to make sure it wont mess anything up. And if there is no harm, I would like to keep the little bit extra duration. Any suggestions? Thanks

F-BIRD'88

I degreed in the isky 201027 cam in my 350 and it was very close.
Any varience was most likely caused by me, not in the cam grind.
double checked it and double checked TDC.

These are my notes on the install:

measured 050" duration 248.5 degrees
intake lobe timing 19.5 49 104.75 intake C/L

Some things that will affect the numbers you get when degreeing are
Pushrod offset, Dial indicator shaft offset from C/L of lifter body or pushrod, faulty dial indicator, lifter sticking in the bore. moved/slipped degree wheel.
reading the timing specs off the back of the rocker arm instead of off the lifter body. Non standard radius cam follower (test lifter) Severe lifter bore offset.
Incorrectly ground camshaft. Bent camshaft.
inaccuratly graduated degree wheel. the large the degree wheel, the better.

Your timing specs are off by quite a bit. Do you have another cam you can try. Even an old stock cam will do.

sofakingdom

iTrader: (1)

It's best to measure it on a lifter, rather than a valve or a rocker, to minimize errors like push rod angle.

It looks like your cam's lobes are slightly bigger than the spec, and the cam is a couple of degrees "advanced". Which will go away rapidly as the chain wears a little bit.

IMO, not real far off; and no real significant effect on idle or other performance aspects. "Measure with micrometer, mark with chalk, cut with axe".

Supervisor42

Since this is a solid lifter cam, couldn't this be the ramp to take up the valve lash?