so today we are going to be doing the compression test on the 351. my dad was taking out the spark plugs and out of the 4 on drivers side we found 1 to be in a bad state. the other 3 looked almost brand new still,but the second last 1 from the back was completly black, covered in wat seemed to be oil/coolant.any thoughts on if this could be related to the coolant in the oil?


*Update* Did the test on the bad plug with the piston at the top, sure enough, air bubbles in the coolant along with it rising as we had the air on.

 

were gonna start tearing it apart, hopefully the guy we bought it from wont make us send back the hole motor and just the head.

 

Head gasket or cracked head/block my friend. Bummer.

 

Performed a leakdown test. Bad news on Cylinder #7 -With the piston on TDC as soon as we applied air pressure to the cylinder the coolant level started to rise in the radiator. Hopefully since the piston was all of the way up this would lead me to believe the problem is the head/head gasket and not the block. Let me know your thoughts on this. Look at the 2nd last plug from the right - This is the plug from the #7 cylinder. Bad!!!!