Here is a more 'stock' 455HO engine rebuild that we ran a Summit 2802 cam in it (224/234/114 duration @ .466"/.488" lift). It is .030" over with forged Eagle H-beam rods and TRW/Sealed Power forged (heavy) pistons. The heads, intake and RA manifolds are all untouched factory pieces. The short block was from an older build (2000 miles) and we just added the 455HO heads, intake and exhaust manifolds (2.0625"/2.125" outlets!). The first pull made 410 hp @ 4800 rpm and 515 lb-ft @ 3600 rpm. After richening the Q-jet as far as we could go with the jets and metering rods we brought, it eventually made 431 hp @ 5000 rpm and 535 lb-ft @ 3500 rpm.
Dennis
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