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Message: <blockquote data-quote="LAFENATU" data-source="post: 491291" data-attributes="member: 10097">Take it to the machine shop, tell them you want it bored .030 over and the block cleaned and ready for install. I guaruntee you they will look it over completely and call you if it needs anything more than a bore/hone.300 RWHP is not possible with the average GT40 Iron heads unless you get them professionally ported to the max and have larger valves installed (1.94/1.60) - the stock 1.84/1.54 valves are not large enough imo to make 300 RWHP.My buddy made 281 RWHP with GT40's and they were ported pretty well, nothing pro though.His combo was pretty simple actually..K&N Panel FilterPro-M MAF 24lbGT40 Heads - ported with stock valvesCrane 1.72 Roller RockersCrane 2031 CamshaftEdelbrock Performer Intake24lb injectorsMac Underdrive PulleysFRPP Ceramic Shorty HeadersMac ProchamberDynomax Race Magnum Catback3.73's</blockquote>