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Old 04-14-2019, 10:56 AM   #52
L78CHEVELLE
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Join Date: Jul 2010
Location: London Kentucky
Posts: 356
Default Re: 40 V8 compression change all cylinders same time

Quote:
Originally Posted by cas3 View Post
before you take anything apart, do a cylinder leak test to see where the compression is going. if you dont have the fancy tool, i dont, you just weld an air fitting to an old spark plug, screw it in, get that cylinder to TDC and put low pressure, like 20lbs to it and listen. air out the carb=intake valve. air out the exhaust pipe=exhaust valve, and air out the oil fill/breather cap=rings. if you get all the same valves, i would suspect cam timing. this one is a puzzler!
I am going to try and buy a piece that will allow me to put air into the cylinders to check for leaks before I take the heads off this week. If it was not for the help on the Ford Barn I would have to push the car to the back of the garage and wait until I came up with a new approach to the problem. THANKS TO EVERYONE.
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