rossman Posted November 3, 2008 Author Share Posted November 3, 2008 The scratches are deep enough to hang a fingernail on. I'd say they were between .010" to .015" deep and located right at the edge of the cylinder. Quote Link to comment Share on other sites More sharing options...
Noddle Posted December 8, 2008 Share Posted December 8, 2008 I was doing some pre mounting for my EDIS on my parts car (MR30 Skyline), and noticed the block (L24) was notched, to support a N47 Head, so I took some happy snaps for other who may what to see how Nissan done it from the factory. Nigel Quote Link to comment Share on other sites More sharing options...
Daeron Posted December 9, 2008 Share Posted December 9, 2008 Oh wow it almost looks like they used the blocks as a a source from which to stamp woodruff keys...... Quote Link to comment Share on other sites More sharing options...
JMortensen Posted December 9, 2008 Share Posted December 9, 2008 I was doing some pre mounting for my EDIS on my parts car (MR30 Skyline), and noticed the block (L24) was notched, to support a N47 Head, so I took some happy snaps for other who may what to see how Nissan done it from the factory. Obviously that works just fine for valve clearance, but it seems to me by smoothing out the sharp edges and matching the headgasket to the block so that there is a smooth transition from one to the other it would be possible to get better flow out of the valve. In other words, that looks utilitarian rather than performance oriented. Quote Link to comment Share on other sites More sharing options...
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