If your going to build a 450-500 hp engine with upgraded parts, why not go with a stroker motor. All things being equal, using the 423 hp motor listed above, then adding another 47 cubes oughta get you into the 450 hp territory maybe a little higher. Optimistically it would put you in the 480 hp range?
450 hp engine
347 stroker assy.
77mm Mass-Air meter
75 mm T-body
Edelbrock Victor 5.0 (or Ported Performer RPM)
AFR 185cc heads
Comp Cams 280+ Extreme Energy (or Nitrous HP, go figure when I contacted CC about just such an engine with AFR's published airflow figures they suggested the biggest Nitrous HP cam in the 5.0 hydraulic roller section)
11:1 c/r (fuel injection, aluminum heads, 180 deg thermostat, and good radiator might make it possiblem, then again it might be entirely possible because I have a 10:1 iron head motor using 92-93 octane with a carb and a moderate duration cam with 278 degrees of advertised duration)
1-3/4 long tubes
30-36 pound injectors
Really the question is where do you want to make 450-500 hp. If you can spin the bugger high enough and keep cylinder pressure from falling of then it could make the power. But in the realm of hydraulic roller engines, your probably gonna be stuck at around 6500-7000 rpm. Which will take big time mid to high rpm torque to accomplish. Say you want 450 hp at 6000 rpm, that'll take 394 foot pounds of torque at 6000 rpm to accomplish, at 5000 rpm your looking at 473 foot pounds of torque. For a 347 to make 400 foot pounds of torque at 6000 rpm, your looking at an engine that has to be in the vicinity of 100%+ volumetric efficency, naturally aspirated.
When I get mine done, I'll get back to this post
