Good excuse to go full forged route with HR head conversion .... take a peek at the GTM heads that flow 330 cfm which will get you close to 500hp on a solid build ... consider sleeve and overbore - 100mm bore and std stroke will get you to 4.05 litres which with decent cams should let you get close to 500hp - you;ll probably need an aftermarket ECU and individual throttle-bodies to manage it all though ... good luck with the build
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