Question about 1996 Ford F350 Crew Cab

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New long block

Just had my 351w longblock installed. Runs bad.Checked compression on #1 cylinder and it was 122. Is that normal

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  • tycinc3 Jun 19, 2010

    I think 122 is pretty low. I just had mine rebuilt and I have 150 . But more important for a good running engine is that they are all with in 10% of each other. Are they all 122? How did you take compression. Was the engine hot , were all of your plugs out. If only 2 are low and they are side by side , you could have gasket problems. Have you tried a wet compression test? Try squirting a little oil in the cylinder and test again to see if it raises the compression. You said long block so i guess you have new heads.



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As long all cylindre compression are within range of +/- 2-3 then it is OK. Good?

Posted on May 04, 2010

  • tsantawirya Jun 19, 2010

    What tycinc3 suggested is relevant depending on what you want out of your long block. If you expect a higher performance output then off course 122 is low compared to 150, again if they are evenly range spread out and engine is giving you efficiency you expected, there you go that is good. Basically all are what you expect from your engine's performance output. If you are sure that only one cylinder is deviating more than 10% than others then you may have a leajy oil & compression ring, or your intake or exhaust valve not seating properl, many factor can be investigated, only at day end you must determine what you want to do with it.

    If after wet testing, compre4ssion didnpt improve then you may need a top half overhaul to correct compression ratios.

    Good luck, mark this advise please accordingly.



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