i have used copper locknuts for the exhaust, and now i have the 11mm head brass nuts from Aircooled.net...i highly recommend them...they provide extra clearance when used with headers and they are a bit "longer" than the standard steel nuts....when the stroker gets built you can bet your last dollar i will spend my last one on the brass nuts....LOL
------------------- Chris Perdue
*All opinions are those of the author of this post* "Sometimes you're the windshield, sometimes you're the bug"