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#1
12-23-2011, 01:56 PM
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Had a very similar thing happen in the 80's (man I am getting old). It was an Accel cap. Never found out what caused it, never saw it again until now. I just chalked it up to a manufacturing flaw that showed up after vibrating on the engine.
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#2
12-23-2011, 02:06 PM
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Did ya get mad at it Calvin...?...
 Merry Christmas bud... 
__________________
 ECM member. 2008 Outlaw Pontiac Drag Series Champion MANDRA Do it now fool! Life is short. 69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far..  through mufflers. 1.26 60'. Going back to track with pump gas engine.... My 60 Ventura retired to street/strip duty.. |
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#3
12-23-2011, 02:36 PM
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I have seen a few caps break like that but it was usually in a street application and a non-vented cap with spring clips, like a Mopar. In those cases it was fuel vapor making it's way into the dist. from a super rich condition or a non-working PCV. If it was not struck and broken as mentioned, I would check crankcase ventilation. I usually drill several vent holes in all my race caps to prevent this and any ozone build-up.
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