8. Now Joe removes the water pump and takes a peek inside to see what might be going on. As noted in the last month's installment, with the amount of corrosion found in the radiator, he suspects he will see something much the same in the water pump and timing cover. Holy moly! That is exactly what he discovers.

9. Did the corrosion travel to the thermostat housing? Yes, he finds more of the same massive rust and buildup.

10. In contrast, however, the removal of the intake manifold and valley pan shows a remarkably clean and almost unused crankcase. At first glance, the cam, lifters, and pushrods all appear to be brand new.

11. Once the rocker arms are loose and the pushrods are out, Joe unbolts and removes the cylinder heads to reveal the condition of the pistons and the cylinder walls.

12. Ouch! He discovers scoring in the cylinder walls. Cylinder No. 7, shown here, is the most severe one of the eight. Sharp eye readers will see that this 400 had previously been outfitted with 0.060-over pistons. Will the block clean up? We'll have to wait for a future installment to find out.

13. Joe notes a dried oil drip on the side of the No. 4 cylinder wall. He suspects a leaky valve seal.

14. After removing the oil pan, he sees the sea of sludge on the its bottom. "It's quite puzzling for an engine with very few miles," Joe says.

15. Joe removes the main caps and several rod caps to inspect the bearings for wear.

16. "I found what I consider to be unusual and excessive wear for a relatively unused engine," he says. "It appears improper torquing, trash in the oil, or a combination of both has damaged the bearings."

SOURCE
Classic Pontiac Rescue
http://www.classicpontiacrescue.
com