High throttle miss

[Gaz64]

Originally Posted by Texasdoc

Question: Would a cam that is incorrectly degree'd cause a high speed miss? I degree'd it when I installed it, but if I made a mistake then, would it cause a high RPM miss? Just grasping at straws here. I don't think this is the problem as it ran great with the EFI (whenever the O2 sensor decided it wanted to work that day). I don't remember what I ended up setting it on but I think it was advanced.

I also had to use a shorter timing chain due to excess slack from having the block bored/honed. I doubt a shorter timing chain would affect the cam to crank position enough to cause problems.

Sounds like you have a chain set for main saddle line bored block.

The sets I have used for this have slightly larger gears, same chain.

Your misfire is ignition or engine related (valvespring etc), single 4 barrels don't cause misfiring, they can cause surging or low power, flat spot etc.

Misfiring is a dead cut on one or more cylinders.

Gary