Cracked valve guide bosses :(

[tornik550]

I recently purchased a new engine. I don't know much about the history other than that it came from a running engine. Conpression and leak down is normal. I just finished welding the motor mount into the car and was getting ready to install the engine. I had taken off the carbs to clean them and I saw that the cyl 1 valve guide boss had a chunk broken off. I then inspected the other cylinders and found cracks in some of the other valve bosses had cracks.

Soooo... I assume that it's time for me to install new heads sad.gif

Can someone school me about 911 heads. What kind of heads do I need to get? I have a 2.2l case but I have 2.7 liter p&c and crank.

Does anyone have any instructions in how to remove the heads?

Do I need any special tools to remove the heads?

The engine currently has stock 2.2e camshafts. Should I change to different cams while I am in there? I am using zenith carbs.

[roblav]

I'd take the entire thing apart and sell everything for parts. Then start with something better.

The older 2.2 mag case is weaker than the 2.7 7R type, which itself can be weak without fixing the issues. If you run it and drop a valve (or seat), you will quickly hole a piston and damage all kinds of stuff. I once ran one of these engines (a 2.0 alum case Solex) with a hole in a piston for 250 miles just to get home. Added a quart or two of oil every 50 miles or so. The crank and case remained OK. (The early ones were pretty robust.) You'd rather not want to go through this!

In your case, the sum of the parts is worth more than the whole. Plan to either build up a proper relatively lightweight 7R mag case with S cams and Webers or find a 3.0 core to build up or find a 3.2 and use the factory ECU and intake. The cheapest route will be the 3.2. I find the the 3.2 setup boring because the torque curve is too flat. A well built 2.7 mag case with S cams, proper head porting, and Webers will be a LOT of fun. Don't even bother with the E cams in that setup regardless of what other people tell you. The bigger bore needs the bigger cam.

You seem to keep finding issue after issue with your engine. Let it go and start with something decent.