Supercharging id run no bigger than a "R" cam. Too big a cam and you will bleed boost off due to too much overlap.
WIth a K20 id look into the Rotrex aka Kraftwerks superchargers, they are really nice and make as much power as a turbo.
Benefits to supercharging (JRSC) is its cheap, good power, easy to install , no bov, no wg, no turbo manifold, no turbo etc
Cons it only makes SO much power, it gets hot (no way to use an intercooler)




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