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best bang for the buck is a bbk ssi. a stock ls2 isnt worth the minimal gain over an ls1...plus youd have to buy a thottle body, or atleast an adapter, then fab a bracket on the ls2 since they dont have a throttle cable bracket for it... keep in mind what you have done to the car, as bolting on an ls6 may be worth 7-10whp over a factory ls6 but can be worth twice that with supporting mods... anything over 400whp can really see the gains from the ls6...
my list ls1<ls2<ls6<ported ls2<bbk ssi (85mm)<fast 90/92
if i had an fbody... id run a 98mm lid gm 85maf slp bellow 85mm bbk ported throttle body and bbk ssi intake manifold bout 850-1000.... all 85mm as the 98 is rated as an 85mm. if it were a heads cam car... just exhaust and stock cam, slp lid ported stock 78mm maf fernco coupler, ported factory tb stock ls1 intake




