by manifold » Wed Dec 03, 2008 2:28 pm
Starting work on the bottom end.
In order to fit the head I had to drill out the extra 2 stud holes like the cooper s and 1300gt engines. This was taped out using first a primary tap and then a plug tap to 5/16" UNC (same as gearbox bolts) to a depth of 17.77mm. In addition, the existing stud holes were drilled further down to a depth of 29.94mm and the taped with a 3/8" UNC plug tap.
The difference between a primary tap and a plug tap is that the plug tap has the thread nearly all the way to the bottom, whereas the primary and secondary tap have a taper to start the tap off. The plug tap is used to get the thread right to the bottom of the drilling.
See the difference here
Started to put crank in by first putting mains shells in (with the hole), then pouring a fair amount of engine build lube.
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