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Compression in #'s

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Old Jun 19, 2008 | 11:26 AM
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Compression in #'s

Maybe its here and I haven't found it yet; what would be the #'s of compression for a 1980 460 ci stock engine. Just in the ballpark if possible. Thanks
 
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Old Jun 19, 2008 | 01:07 PM
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I believe it is 7.9:1 comp ratio. Is that what you mean or are you looking for PSI?
 
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Old Jun 19, 2008 | 01:38 PM
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Compression

Yeah I need the poundage.........Kids have a boat with a 460 in it. Ran a compression ck on it this am. Most are around 110 but one is 90-95. Crankcase showing some water in oil but it is in a boat. Still think may be a head gasket...........Thanx
 
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Old Jun 19, 2008 | 02:41 PM
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A V8 should make at least 120psi, many will produce between 150 and 200psi, depends upon how well the valves and rings seal.
 
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Old Jun 23, 2008 | 11:36 AM
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Yeah sounds like head gasket. 110 seems a tad low, but if it's pretty close on all cylinders after the gasket change, run it.
 
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Old Jun 23, 2008 | 12:51 PM
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My injected, 92 460 just tested 145-150 on all 8 cyls. 6-7 thousand mile reman'd motor, so its pretty fresh.
 
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Old Jun 23, 2008 | 01:46 PM
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My I-6 numbers are 155-165 on all 6 cyl's...
My odometer reads "91,250" It had 72,000 on it when I got the truck, all I know that is was a "farm truck" most of it's life.
Is it possible that is the orignal mileage? Or is that a normal # for the straight 6?
I thought it was a little "high" for it's age, thats all....
 
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