Not a chance. The 400 has perimeter frame and engine hanging points are completely different. Also subframe, swing arm and shock bolts to 400 engine. Those areas will bump into 300 frame.
I guess if you scavenge enough of 400 frame and cut & weld pieces of 300 frame to it, that can work.
Tank from 400 also doesn’t have hump to clear backbone frame on 300. You’ll need tank for fuel-pump and EFI system. Carbs on 400 engine will lose you 5-7hp and you won’t be much faster than 300 because of extra weight over a clean 400.
Last futzed with by DannoXYZ; June 6th, 2018 at 08:16 PM.
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