[Formulajones]

700 hp from a 555 BBC is an extremely mild build. Typically BBC's that size and pump gas can easily top 800 or more with a pretty decent cylinder head and a hydraulic roller and be pretty maintenance free. Hell I just bought a 598 BBC from blueprint that made 786 hp 772 tq with a very small 258 @ .050 hydraulic roller and marginal heads that only flow 350 cfm, for their size I can put a better set of afr's on it and bump the cam up a smidge and make 850+ with this engine and still drive it everywhere.

Dad made 724 HP 764 TQ with his 571 Pontiac on pump with a 261 @ .050 hydraulic roller using an old set of Eddy round ports heads, and he drives that thing every place, very docile. Bischoff who built that engine would have liked to put a better head on it and see it make another 75-100 HP but the budget wouldn't allow it. When is it enough anyway.

Much easier and much more docile to make these numbers with a larger engine. Trying to do it with a 455 is going to be on the radical side and knowing how most guys are in this forum they won't like driving it much.