Popping noise

[eddiefisher]

I have been working on my 72 911 Targa engine and have finished up rebuilding just about everything including the heads. The one thing I did change was stripping out the mechanical fuel injections and adding the webber carburetors. No when I start my engine is has a popping sound from the engine, I need help to determine what maybe causing this popping sound is it from the Valves or the carburetor's any help or advise would be great!!

[Bob Kontak]

Throw us a bone, Eddie.

Is the popping sound from the exhaust or out of the carbs?

Regarding valves, what is the timing you are using? Did you set the cams using a dial indicator?

What was the lift you dialed in at at overlap TDC?

[thumbdoctor]

light popping out of the carburetor throats requires idle mixture balancing and and compensation screws adjusted. Should be done using a slack tube or Uni sync.