Gramma's Car: the new project!

[njsteve]

Here's a question for you camshaft gurus out there:

We started the process of degreeing the camshaft and have come up with some numbers that don't seem to match the tech card on the Summit 2802.




Intake cam timing @.050 is supposed to open at 3 BTDC with intake centerline of 109 degrees

What we got @.050 was: intake opens at 1 degree BTDC with intake centerline of 110.5 degrees.






Exhaust cam timing @.050 is supposed to open at 56 degrees BBDC with exhaust centerline of 119 degrees

What we got @.050 was: exhaust opens at 54.5 degrees BBDC with exhaust centerline of 116 degrees

These results were the average of 3 tests.= for each set. I used two solid lifters.

So I tried using the three position crank sprocket at the advanced position (it has a "+4" stamped there) and it moved the intake opening to 9 degrees BTDC from 1 degree. Now, instead of being 2 degrees retarded from the 3 degree spec, it is now 8 degrees from its original position (or 6 degrees advanced from the 3 degree BTDC spec).

So I assume that is way too far in the other direction for an adjustment. I guess I have to buy another double roller set with a 9 position keyway and try to adjust from there. Cloyes makes a nice one that is around $95 from Summit.

I am not a math whiz so I am guessing that a 4 degree crank sprocket advance position actually moves the cam 8 degrees due to the fact that the crankshaft rotates twice for every single rotation of the cam?

What about an offset cam sprocket woodruff key? The smallest increment they sell is 2 degrees (Mr. Gasket). Here is my question: will a 2 degree cam key move my final dial reading two degrees to the preferred 3 degree spec or will it add 4 and make it 5 degrees total?

Help me Obewan Kenobee, You're my only hope...