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Good evening - I have a 66 SS, SBC400, 10.5:1, Lunati street performer cam, 4 speed Muncie, 3:73 rear, that previously had a Edelbrock 7001 performer RPM manifold. With that manifold, the car ran about 180 and temp was very stable. I recently had changed the manifold to an Edelbrock 7501 AirGap, and now the car is running hot to the point that I need to shut it down before it overheats. Slowly creeping up 220, and continues to slowly rise. Have any of you experienced anything similar when installing a 7501? This manifold has 2 water ports in the rear, that the 7001 did not have. Additionally, when I shut it down when it’s hot, the dieseling that occurs is scary. Could this be caused by the block itself getting too hot? Any input or comments would be great.
 

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Shouldn't make a difference, the back ones are a dead end on the one that ran cool, 7501 will be the same with plugs in the ports, but you can open them up if you connect the two together, try it and see what happens.
 

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Sounds like a possible timing issue. Overly late timing can cause overheating.
 
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