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Old June 6th, 2018, 03:51 PM   #1
john pierson
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Name: john
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Engine swap

Will the 400 fit the 300 frame? Just curious as my 300 only has 8.5k on it. I'm thinking there will be crashed 400s around soon.
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Old June 6th, 2018, 04:10 PM   #2
DannoXYZ
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MOTM - Nov '17
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.

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Old June 17th, 2018, 07:58 AM   #3
JohnnyBravo
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Sounds like you should have both (evil grin)
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Old June 17th, 2018, 08:15 AM   #4
DannoXYZ
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Yes, when in doubt, have one of each!
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