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| Re: later a12 engine blockage?? |
Subject: Re: later a12 engine blockage??
by Gary_P on 2007/9/13 15:37:43
You do not need to drill out this hole.
On all the A series engines the oil for the rocker assembly is delivered via the middle head bolt hole. On the early engines the oil passage you are looking at goes out the top of the block, into the head and then makes a 90 degree turn into the bolt hole. On the later model A series engines the oil passage makes the entry into the bolt hole in the block instead of the head.
If you look in the side of the block just below where you think the missing hole is you will see a small plug in the side of the block. This is where they drilled the oil passage into the middle head bolt hole.
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