i am new here so here goes i have a 99 cobra 4.6L 4 valve ran hot did compression test all are at 175 except the two middle cyls. on drivers side. they were # 6 145 and # 7 .135.i seen white smoke out exhaust one morn but never seen it again and never ran hot. wife drives about 5 miles a couple days later said it pegged the temp gauge i am thinking blown head gskt . i bought a block tester kit will that tell me anything for sure or is there anything else i can check motor has about 60,000 miles need some help thanks

 

What does the oil look like? What was the coolant level at after your wife noticed the temp pegged? Symptoms of a blown head gasket are:

• White smoke from the exhaust pipe.
• Bubbles in the radiator or coolant overflow tank.
• Overheating engine.
• White milky oil.
• Fouled spark plugs.

 

the oil is clean not milkey i put about a gallon of watwe in the overflow started the car and waited for the temp to get up to normal and tested the block with a block tester and it took a little bit but the fluid turned yellowish after a little bit i then shut it off and the overflow went down quickly and i havent done anything since then except put the overflow cap on it. it didnt run hot when i tested the block and there wasnt alot of white smoke either in fact the smoke that was coming out the exhaust disappered rather quickly lile it was condensation