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Old 03-17-2008, 09:38 PM
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It'll run. I built a budget 355 with a stock 305 crank years ago and it had a slight vibration at 2500 rpms but ran strong. I spun it to 6500 rpm many times and it held together. Fire it up!

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Old 03-18-2008, 06:45 AM
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I've been running one in my truck for over a year. It doesn't vibrate any worse than a stock engine. I've driven this truck nearly everyday. Yesterday I hauled three full loads of gravel that weighed over 2500lbs each. So it is a work truck, but it rarely sees anything over 5 grand.

If it's a budget build run it, If it shakes your fillings out... well you know what
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Old 03-18-2008, 12:10 PM
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Just run it. I built a 262 with a 307 crank shaft in it and never worried about the balance. I never noticed any vibration in it and I ran it hard. Balanced perfectly is for race engines daily drivers are less picky. Dale
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Old 03-18-2008, 01:18 PM
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It all depends on how far out of balance the assembly is, in my experience running a 305 crank in a 355 worked OK for what that engine needed to do. But...., I've also seen a friend build a 12-1 406 with 5.7rods and he never had that assembly balanced- it shook itself to death.
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