Guest gbvol54 Posted February 11, 2003 Share Posted February 11, 2003 What should compression and leak-down tests results on a rebuilt (but yet to be started) long block look like? I just finished assembling the long block (SBC 350) for my daugther's Trans Am (yeah, the Z has to wait again.....). I did an economy rebuild; honed cylinders, new rings, bearings, timing chain, oil pump and a mild/medium cam (couldn't resist). Got some "rebuilt" heads off e-bay which yeild 9-1 compression. I decided to check out my work prior to installing in the car. A compression check shows 130ish PSI in most cylinders with #6 at a low of 110. A leak-down test shows consistent measurements around .95 with (again) #6 at a .9 reading (leaking through the exhaust valve). How much is too much? I'm afraid I should at least pull the head and lap the exhaust valve on #6 to get it consistent with the rest, but even then, is 130 PSI reasonable for a unfired rebuild? Quote Link to comment Share on other sites More sharing options...
DavyZ Posted February 11, 2003 Share Posted February 11, 2003 *bump* Quote Link to comment Share on other sites More sharing options...
jt1 Posted February 11, 2003 Share Posted February 11, 2003 130 sounds reasonable to me. It will improve with break in. John Quote Link to comment Share on other sites More sharing options...
Guest gbvol54 Posted February 11, 2003 Share Posted February 11, 2003 Question relocated to "Trouble Shooting/General Engine" at moderator's request. Quote Link to comment Share on other sites More sharing options...
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