I've had a 401 in my AMX for many years, but my uncle and I always seemed to tune the engine by the 390 specs. The 390 calls for 0 degrees advance and the 401 about 5 degrees, right? Well last summer I drove the AMX to Phoenix for the 2004 AMO National and still had a hot engine after putting in a $375 "special" radiator. While in Phoenix I got the tip from someone to use the 401's timing spec of 5 degrees, and on the way home going through a 115 degree desert the engine ran around 190 degrees. So yes, if the 401 doesn't have enough advance, it'll stand a chance of running warm to hot.. Mark ------------------- Date: Thu, 14 Jul 2005 23:27:21 -0700 (PDT) From: Tom Jennings <tomj@xxxxxxx> To: mail@xxxxxxxxxxxx Subject: Re: 401 operating temperature On Fri, 15 Jul 2005, Bill Dettman wrote: > Can anyone tell me about how to keep a 401 running cool. Here's my issue: If it's not a cooling system problem (collapsing hose, spun water pump impeller, etc), it could well be not enough spark advance. ------------------- M@rk markmel77@xxxxxxxxx fax:(626)608-2049 aka mightypilot