comp results, kinda

[64 200 ranchero]

i started doing a comp test and before the gage broke i got these results up to the 4th cylinder #1=155, #2=125,#3=130,#4=130, it did have an internal coolant leak, i tightened up the head bolts and it went away but still gets a little hot but not overheat on the freeway, i think my head gasket is blown, what do you all think

 

[69.5Mav]

Ran into this myself last week.

69.5mav 170-L6 3 Speed stick, 188K + 6.5% on the clock.

Car started to run bad. Inconsistant ignition.

Warmed the engine up pulled the plugs to do a compression test. 1=170, 2=170, 3=165, 4=135, 5=150, 6=170.

But what I found is that the plug tips were fouled by a white stone like deposit. This is consistant with coolant leaking into the combustion chaimbers. I check coolant level down by almost a gallon over about 10K miles. I scraped the deposits off the iridium plugs and the car runs fine now. I wonder if I could put distilled water in the radiator and use that as a surigate water injection system; not.

I'm going to retorque the head bolts, use some bars copper block seal and test the coolant system for leaks with a pressure tester before and after.

Do you have a shim head gasket or composit?

You might pressurize each cyclinder and see if any air comes out of the radiator or other places.

 

[64 200 ranchero]

it is composite, the funny thing is that my engine runs very strong, i think ill do another comp test with a different comp tester. before i retorqued the head, i could see lots of bubbles in the radiator and i would have to top off the water every few days, after i retorqued, the bubbles went away and i dont loose coolant anymore. i have another composite gasket that i will install after i get some head studs