I have mad a DISCOVERY!!-coolant leak from exhaust manifold bolt holes

StrokerScamp said
I don't think the holes are rusted through. I think they are like every single other big AND small block Mopar engine head. Drilled through. Remember, the factory did crappy machine work at best. It would be just like them to barely drill the holes through. Every single factory head I have ever seen had the two end holes drilled through, so I don't think all of them rusted. They were made thataway.

Exactly. My first Mopar and my 2nd Mopar were both only about 1-2 years old when I installed headers on the 69, and had the '70 apart, which already had headers. So two cars, both 1-2 years old. THEY LEAK coolant.