Took bottom end of the engine to the machine shop , after getting the heads looked at , and finding out that they were trash and not at all what the were suppose to be. Well guess what , the bottom end is trashed. Luckily I stopped running the engine at the right time. The rod , cam and main bearings were toasted. This is after 30 hrs. on the rebuilt engine. Luckily the crank can be turned. But once again most parts were not what was disclosed when purchased. For those who have followed this adventure of the E Bay purchased 71 Nova, I once again contacted the seller to let him know of the machine shop analysis. His answer now is, are you ready for this?, the engine must have been switched by the carrier, in transit. After getting nowhere with him I called the dealership who sold the car for the seller, who is an employee of theirs, and they would like to have pictures of the torn down engine and parts. Looks like the dealerships reputation is at stake here. This is a pure case of fraud, listing all of the parts that are in the engine, which aren't. If I can't get anywhere with this approach, then a call to that states attorney general will be forthcoming. As Far as the machine shops analysis on the engine failure, they believe the oil cooler was the culprit. They have seen it happen over and over again. They say it's just too much distance for the oil pump tp pump even if it is a high volume pump or not.