No Replacement for Displacement (myth or fact)

Your ET/MPH simulations are REALLY aggressive. 480FWHP is going to be lucky to run 10.9x0/121ish at 3400. It's going to need to leave REALLY hard with superior 60' times to get to the 10.9x range.

Read Moper's comment over and over. It's about the overall package.

What works well for a 340 may not and likely will not be good with a 4" arm.

The BIGGEST reason that the "No replacement" comes about is because it's easier to meet an HP goal when you start with a bigger pump. If I want 550 HP, it's easier to get 1.1hp/ci out of a 500" engine than 1.6hp/ci out of a 340. Plus the range is much lower on the 500" engine, easier on valvetrain, etc.