I have removed the cam from the 350 I'm trying to build. There is a possible ID code on the cam, I13. Does this mean anything? If not how can I determine the specs of the cam in the motor?

I'm also trying to remove the hydralic lifters. How do I do this without damaging them? They are lifted out of the way of the cam, partially removed.

Thanks

 

measure the small side of a lobe and then the long side take the differance and times by 1.5 i ithnk will get your lift or you could indicate off the lifter or rocker. if you use the lifter times it by 1.5. the duration is lot harder to figure and if you know the lift you ought to sure enough if you want to keep the cam or not. i usually just use plires on the lifters if they don't come right out.

 

Don't reuse them if you use pliars. I always have been able to pull them out with my fingers. The only way to spec a cam is with a dial indicator and degree wheel.

 

How do you spec the cam with a dial indicator and degree wheel? I should have check before removing the heads, oh well this is my first tear down.

If I need to use the pliers for lifter removal, they are getting tossed.

Thanks for the replies.

 

You're still ok with the heads off.

1. Attach degree wheel to crank
2. Use a piece of wire attached to timing cover as a degree indicator/pointer
3. Mount the dial indicator to the block deck
4. Place the needle on the #1 piston and get it as perpendicular with the piston top as possible.
5. Bar the engine over forwards to TDC of the compression stroke and go past TDC by .020
6. Note the position on the degree wheel
7. Bar the engine over backwards 360* past TDC to .020
8. Note the position on the degree wheel.
9. Take the difference between the two readings. This is done to take the slop of the crank into account.
10.This is your actual TDC point
11.Bar the engine over forwards to that degree marking
12.Set the degree wheel to TDC on the compression stroke of #1 cylinder
13.Position the dial needle on the lifter getting it to line up with the lifter bore axis as good as possible.
14.Making sure the lifter has zero lift on it zero out the dial indicator.
15.Bar the engine over until the dial indicator reads .050 in.
16.Note the position on the degree wheel. (IO)
17.Bar the engine over until you get to max lift and note the position. This is the center of the lobe.
18.Continue barring the engine over until you get back to .050 lift.(IC)
19.Note the position on the degree wheel. The difference in degrees in the duration @ .050 lift. Do the same for the exhaust. The LSA (lobe separation angle)is the difference between the centers of the two lobes. This number signifies valve overlap. Total lift is the max lift on each lobe.