bernie lomax Posted November 26, 2008 Share Posted November 26, 2008 how much can I shave my stock N47 head before I get into problems w/ valve/piston clearance & timing chain slop? I would like to gain as much compression as possible...is there a rule of thumb, ie. 40 thou is good for 0.5 compression? thx Quote Link to comment Share on other sites More sharing options...
NismoZ Posted December 1, 2008 Share Posted December 1, 2008 i wouldn't shave it that much...better off just throwing some flat tops in it with a 1mm Felpro HG in it....that will give you a nice bump in comp... Quote Link to comment Share on other sites More sharing options...
2eighTZ4me Posted December 1, 2008 Share Posted December 1, 2008 Anything more than .015" and you'll start needing cam tower shims (which are conveniently sold in .015" size) to compensate for timing. There are a few folks that have shaved .080" off the head and shimmed the cam towers. This basically digs in to the head's combustion chamber area and lessens its' volume, thus increasing compression. Do a search and you should find the article/thread that goes into detail on this. Quote Link to comment Share on other sites More sharing options...
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