We have built several stock resto type engines for customers that we extrude honed the intakes and exhaust manifolds. No before and after dyno comparisons, but they all made good power when done. Problem is the extrude hone process costs more that the actual manifolds do. Yes, it is pricey. For those looking for every h.p. but stoll looking factory such as the F.A.S.T guys the money is probably worth it.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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