Sorry that I'm late to the game here as I just spotted this forum with a random search on another subject,
I've got a 1970 350 stroker using the Butler Performance 4.25 kit with the cast Eagle crank, forged H-Beam rods and forged Ross pistons. Block was bored .60 over for a displacement of 413 cu in. With the 6X-4 heads (2.11/1.66 valves) and Fel-Pro gasket, compression ration calculated out to 9.13:1.
Intake is an Edelbrock Torker I for spreadbore carb with the stepped plenum floor. Carb is a quadrajet for a 1971 Buick GS455 Stage-I modified for Pontiac throttle linkage.
Running Comp X276HYR with Comp 1.5:1 roller rockers, Comp springs and Johnson hydraulic roller lifters.
Dyno runs produced 442 ft lb at 4200 rpm and 453 hp at 5600 rpm. Engine easily pulled to 6200 rpm. Thanks to the smaller bore, rotating mass isn't as much a concern for rpm range.
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