[RBAILEY]

Its a 455 block with the factory chamfers for the intake valves. Gonna be a while before I can put an aftermarket block build under this very nice set of 385CFM heads that were set up with the 2.25 intakes (CNC ported at SD and reworked/hand finished by Dan Barton) The guy I bought the heads from ran them on an aftermarket block 535.

Does anyone foresee any mechanical clearance issues.

I know these heads will not see their potential on top of a 4.211 bore due to the intake shrouding with this cyldr size. The 74cc chamber overlaps the bore on the intake side substantially.

I did put the heads on a .030 over 455 bare block and turned it upside down with an intake valve in place and it does get close to the cyldr wall (will try to get a measurement on this but looked like not more than .030 by eyeballing it)

I'd like to hear from guys running high ports with similar flow specs on a factory block and what kind of horsepower levels reached; ET/MPH, car combo, etc