RE: [Chevelle-list] Spark plug question

[crobertson1]

Holly 650 DP   -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bill Vander Werf Sent: Sunday, May 22, 2005 5:18 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] Spark plug question   It sounds more like an overly rich carburetor. What carb are you using?   Bill Vander Werf   ----- Original Message ----- From: crobertson1 To: Chevelle List Sent: Sunday, May 22, 2005 7:47 AM Subject: [Chevelle-list] Spark plug question        I have a 396 engine in my 69 Chevelle with heads from a 73 Monte Carlo 454.  My problem is that the spark plugs seem to collect a lot of carbon causing the engine to run very rough after a short period of time.  The heads call for an AC R44T plug.  I was told to run a hotter plug so I went with an R45T.  I still have the same problem.  Any suggestions?  What is the hottest plug I can use?  Thanks   Craig