CYL#1 -111
CYL#2 -105
CYL#3 -104
CYL#4 -111
CYL#5 -138
CYL#6 -103
Looks like Cylinder 5 took a crap, I pulled the spark plug and it had coolant and oil on it. Looks like head gasket job, any suggestions on the easiest way to get the job done?

 

Umm... Higher numbers is better. Looks like you're low across the board EXCEPT for cylinder #5. I think your rings are very worn out if all your numbers are that low. Looks like it's more than a head gasket. Looks like it's a full rebuild.

 

If he found coolant and oil on the plug with the highest reading I think the coolant and oil sealed the rings more then usual which gave the higher reading. I would say check the head gaskets first, worst comes to worst he's already a step ahead if he decides to rebuild the motor.

 

Does anyone know what the normal compression numbers generally are for these motors?

 

FSM for 87
Standard
NA 173
Turbo 165
Minimum
NA 128
Turbo 121
Differential limit 14 psi

 

Looks like I'm doing a rebuild, thanks