viewtopic.php?f=51&t=976&p=1706&hilit=sonic#p1706
http://www.arengineering.com/articles/articleframe.html
http://www.arengineering.com/articles/sonicbig.html
http://www.goodson.com/technical_suppor ... InHead.php
viewtopic.php?f=51&t=976&p=1827#p1827
viewtopic.php?f=51&t=588&p=764&hilit=sonic#p764
well worth reading thru
have the block sonic tested, if you've got any doubts and have it honed with a deck plate, as a general rule cylinder wall thickness should ideally be a minimum of .200-.250 thick, in an ideal worldgetting much thinner,due to boring it larger, allows too much distortion for proper ring seal, and yes we all know guys who get away with .150-.180 occasionally,and thats a reasonable range if your not stressing the engine hard,that should last for years on a street car, but remember just because something, sometimes doesn,t fail the first few dozen or even the first few hundred times, its used, doesn,t mean its operating correctly, Id suggest getting an aftermarket block if you want a larger bore, and your pushing those limits on a stock production block, simply because the decks and cylinder walls are significantly thicker and the basic casting design is stronger, and if the stock casting fails at high rpms you might loose all your components, machine work, etc, certainly making the up front higher cost of the aftermarket block looking far more reasonable if looked at in that light.
http://www.arengineering.com/articles/articleframe.html
http://www.arengineering.com/articles/sonicbig.html
http://www.goodson.com/technical_suppor ... InHead.php
viewtopic.php?f=51&t=976&p=1827#p1827
viewtopic.php?f=51&t=588&p=764&hilit=sonic#p764
well worth reading thru
have the block sonic tested, if you've got any doubts and have it honed with a deck plate, as a general rule cylinder wall thickness should ideally be a minimum of .200-.250 thick, in an ideal worldgetting much thinner,due to boring it larger, allows too much distortion for proper ring seal, and yes we all know guys who get away with .150-.180 occasionally,and thats a reasonable range if your not stressing the engine hard,that should last for years on a street car, but remember just because something, sometimes doesn,t fail the first few dozen or even the first few hundred times, its used, doesn,t mean its operating correctly, Id suggest getting an aftermarket block if you want a larger bore, and your pushing those limits on a stock production block, simply because the decks and cylinder walls are significantly thicker and the basic casting design is stronger, and if the stock casting fails at high rpms you might loose all your components, machine work, etc, certainly making the up front higher cost of the aftermarket block looking far more reasonable if looked at in that light.