Join Date: Aug 2000
Location: Ft Worth, Tx USA
It sounds to me like the cam timing is off now. We think because every thing says 0 all is ok, not so.
There are 4 key ways here to deal with, the one's in the crank, and the cam are the same. you have changed the cam gear, and the crank gear.
Let's do a what if here, what if the dowel hole in the cam sproket is off 3 degrees, since it is geared 2 to 1 from the crank this moves the cam 1 1/2 degrees. Now what if the key way in the crank gear is off 3 degrees, that will be the actual change in the cam. Now the total change is 4 1/2 degrese.
Have you ever wondered why one car right out of the factory runs much better than another car exactly alike. this is why cam timing.
If you don't see this yet I will give you an actual account of this very problem. We had a .060 over small block running circle track and we changed the short block out for another fresh 360 short block. The short blocks were just alike.We used the cam, lifters,heads,from the orig engine to make this engine complete again.
The first engine ran great and was winning races. When we tried the new engine, it was dead headed out of the corners, and about the flag stand it would come on so hard it would almost turn around in the middle of the track.
Here is the solution: this was an old Reed cam with a 104 center line, I took it apart and checked it and the cam was on 99 degreese center line. I then redgreed the cam set it on 104 and this engine now ran just like the first one.
Now what happened here, the key way in the crank was the only different key and so it had to be off at least 5 degrees.
I think if this is in fact the only change made then you are going to need to degree your cam to ever make it run right again.