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-   -   blown bbc (https://www.racingjunk.com/forums/showthread.php?t=24765)

prince 06-28-2009 06:18 PM

blown bbc
 
need help, have a 565 blown bbc, hurt spark plug on #2 cyl. ex. valve, install new valve, repaired seat,install new head gasket and milled head.,install new rings, piston look ok as well as cyl.wall. ran leakage test. 100 percent leakage on #2 cyl and 40lbs compression . no air was coming thru valves. #4 cyl was 80 percent with 60 lbs compression. block is oring and head has receiver groove. motor runs good 4.62@151. shows no blowby.other cyl. have 150 lbs compression. any ideas? thanks

zipper06 06-28-2009 07:34 PM

Sounds like you cracked the head or the block between #'s 2&4, i'm asumming you don't run water, but if you do you can do a pressure test with the plugs out and that will tell for sure if one or the other is cracked.

JMO

Zip.


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