408 still overheating :/

Hi,

Hemi466 is right on IMO. I had the same issue. I changed my vacuum advance source to "manifold", which in turn adds some timing at idle the car instantly ran cooler. Also Adding a set of SPAL Fans over the stock fans that Champion provided took the engine to another level of cooling. 179 degrees at stoplight idle and 183 degrees @ 3100 rpm on the interstate. I was at 213 at a stop light and 196 @ 3100 on the interstate. Changing the vac source made a huge difference! Ported vac by design is intended to increase engine temps on the smog engines to burn up left over hydrocarbons and reduce emissions. There are many articles online by experts that outline this much better than I can.

FYI,
Marion

hemi446 said

This may or may not help but we're is the timing set. Not enough timing or having the timing locked out can cause the engine to run hotter than it should. Depending on the quality of your fuel you may need more timing not less and you may want to run a vacuum advance to help with timing at cruise rpm. Just my 1 1/2 cents good luck

Click to expand...