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I have a 1966 convertible with C4 and 200ci. With a cold engine my compression #'s are:

#1 #2 #3 #4 #5 #6
190 165 145 180 155 180

Do you see a problem?

I have a Pertronix ignition and coil. The plugs all look clean and tan colored. The engine has about 75,000 miles and the cylinder head was rebuilt last year (about 10,000). The engine was missing on acceleration mostly when cold. I live in Los Angeles. I replaced the ignition coil tonight with a possible slight reduction in missing. I'm losing coolant and can't see where its going. Its about a gallon every week or so. I replaced the radiator cap and I have a coolant recovery tank (cheap $10 one). I started the cold engine tonight and noticed some steam out the tail pipe which diminished as the engine warmed up some. There are some dribbles of water on the ground. I drive about 40 miles a day mostly freeway at 80-85 mph.

What do you guys think? Any ideas?
 

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You might want to squirt a few drops of oil in the cylinders
and see if the compression comes up. If it does then it the rings, if it stays the same it's the valves. As far as the coolant
is concerned you might have a small head gasket leak? I get
a liitle steam and water out the pipes when it's cold also!


Regards,
BillGear

1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg
 

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I see a problem with #3 & 5. There shouldn't be that much difference. Does it run hot? 80-85mph generates a lot of heat. You might be losing some water from heat evaporation, but not a gallon every week or two. Where is the leak on the ground coming from. If you have a recovery system there shouldn't be any fluid loss from overflow. A gallon every week or two is too much. You didn't say if you saw water on the dipstick, also check your valve cover/oil filler breather for whitish looking stuff.
Sounds to me like you've got a head gasket leaking.

Lancaster, South Carolina
66 Coupe, 302, Auto, 3.25 gears. [color:red]Candyapple Red</font color=red> with White Pearl Stripes. Cragars.
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It sounds like a head gasket leak is probable. After you put the rebuilt head back on, did you later go back and retorque the head? What do the #2, #3 & #5 plugs look like? #2 is boarderline on being low. Do the oil test the other post talked about, and repost your findings.

http://members.tripod.com/tangdar/
'67 Coupe project car (Did I say project car? I meant pile of rust)
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