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Hole in block

Posted: Sun Sep 26, 2010 7:26 pm
by Vegard
I've been doing two blocks today, and I found this differnece between A blocks and A+ blocks.
What is the last hole for?

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Re: Hole in block

Posted: Wed Sep 29, 2010 10:55 am
by littler
oil pressure release valve drilling?

poke about and have a look haha never really looked that closley nore thought about it to be honest.