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478 to SM420
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March 10th, 2017, 03:40 AM
arepoff
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Join Date: Feb 2016
Location: Walla Walla WA
Truck: 1965 K1000
Posts: 56
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Re: 478 to SM420
yeah, I just had big inch dreams (don't tell my wife!). Looks like the 401 is still a pretty good gain on power compared to the 305 I have. 68hp and 90ftlb difference and it is a bolt in.
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