compression after rebuild super C

Scott Blanchard · Mar 26, 2013

I just got my super C back together. I did a complete motor job, punched it out to 3.25. I ran the motor to heat it up then retorqued the head down. I did a compression test and got about 115 in cylinder 4,2 and 1 in 3 I only got 60#. My gasket isn"t leaking on the outside and I had my head tested. What could be the reason for the lack of compression. Hopefully they need to seat or something. Please help

CLIFF S · Mar 26, 2013

did you go back through and reset your valves after you restore your head?

Cliff S

CLIFF S · Mar 26, 2013

After you Retorqued your Head !

Earl-IL · Mar 26, 2013

Do a cyl leak down test, it will tell you if it is the valves or rings.Listen to the exhaust, carb, or crankcase breather you will hear the air leaking by. Bring that cyl to top dead center both valves closed. Apply controlled air (30--100 PSI ) using a air line pressure regulator. You can make a air adapter out of a old spark plug, weld in a hose adapter.Any question email is open. Earl

Scott Blanchard · Mar 26, 2013

I checked them kind of quickly, That could be it, I would loose pressure if a valve didn't seat all the way (too tight) wouldn't I? If I tightened the head it would put more pressure on the rocker, that makes sense. Thanks. I think I am going to try the air pressure test too.

compression after rebuild super C

Scott Blanchard

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CLIFF S

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CLIFF S

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Earl-IL

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Scott Blanchard

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