Nutta1 Posted May 18, 2016 Report Share Posted May 18, 2016 can a 4k motor be bored out 60 tho safely. Quote Link to comment Share on other sites More sharing options...
7000rpm Posted May 18, 2016 Report Share Posted May 18, 2016 Yes if the bore is still the original size being 75mm Quote Link to comment Share on other sites More sharing options...
snot35 Posted May 18, 2016 Report Share Posted May 18, 2016 What? He means over bored 60 thou, or roughly 1.5 mm to 76.5mm. Quote Link to comment Share on other sites More sharing options...
altezzaclub Posted May 19, 2016 Report Share Posted May 19, 2016 Some people have used 5K pistons at 81mm... although I wouldn't guarantee it for all blocks. Quote Link to comment Share on other sites More sharing options...
filfrederick Posted May 22, 2016 Report Share Posted May 22, 2016 Most blocks will be fine, any decent engine machining workshop will have a sonic tester to measure bore wall thickness. it is a very simple process that is not hard or expensive. anything above .140" wall thickness after boring is adequate. Quote Link to comment Share on other sites More sharing options...
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