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what are your n/a power goals ? for around 480-525 rw with an m6 a stage 3 ported ls6 head will work with the right scr/dcr and cam and of course a ported 92/92 and a cam in the 24x range. if 525-550 rw i would step up to something like a tfs 235 head. any 408 should be able to handle a 150-200 shot easily even with the mahle pistons, if wanting to spray really big later on i would step up to a nitrous type piston .