fishingbucks
Member
Have a newly rebuilt 4-71 2 valve Detroit that cranks and runs good. But, exhaust manifold not heating up evenly. Gets too hot to touch on cylinder 1 and 2 within a couple of minutes as expected BUT manifold on cylinder 3 and 4 doesn’t get hot at all. Can lay my hand on it and leave it there. I currently don’t have a thermostat in it. Could that be the reason? Also, injectors are newly rebuilt and purged of air so I don’t think it’s a firing issue. As I said, it cranks and runs good. I’m puzzled. Any thoughts?