Re: zz4 missing bolt hole in pass. head for serp sys.
Done this twice. No bigge. Even if you drill too far you can use a stud and some RTV. Your water pump bolst go thru the block don't they. I used a stop on my bit but it slipped... HIt the water jacket and just RTV'd it and has never leaked yet. Happened on both engines as the castings for the head can be different. I used the bracket as the guide and a long bit.
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