360->408 Builds at High Altitude Help!

[dusterbuster5621]

Hi everyone! I am mapping out a 360->408 stroker build in Denver CO at 5500 feet. I have been playing around with Dynosim6 and the max horsepower I can seem to get at that altitude is ~450 HP naturally aspirated. Has anyone built any 500+ HP naturally aspirated small blocks at altitudes this high? If so what was your build? I am considering opting for a Paxton super charger system to get higher numbers. I would really like get over 500 HP and still have a streetable car (I do not plan on racing it just want to go fast on the road! haha)

 

[Mean416]

Yup. Mother nature isn't giving you the boost pressure you need. Time for forced induction.

 

[MopaR&D]

I lived in CO for about 15 years. "Up" there the only way to make real power is forced induction. You can build a big N/A engine but anyone with a turned-up boosted car will eat your lunch. I hated it lol, never got to the point where I could afford a Procharger for my 360.

 

[Bewy]

Go for 12.5:1 comp ratio.

 

[MopaR&D]

Go for 12.5:1 comp ratio.

If you do that you might want to add water/meth injection. I found that the dryness and heat in summertime along with high ozone in the daytime offset to an extent the perceived detonation resistance of the lower air density.