Boring a 390
Super Moderator
Joined: Apr 2004
Posts: 34,534
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No. Even if your block didn't have core shift, had the right thickness etc, you risk ending up with really thin cylinders. If you must, as per previous post, get it sonic checked. Read first:
https://www.ford-trucks.com/forums/2...questions.html
Remember, to make a 390 into a 428, you need the bigger bore, and you need a longer stroke. So, do what Ford did. Just add the stroke. With the stock bore, it's the 410 from '66-7 Mecurys.
Best to have the thickest cylinder walls you can anyway.
If you want to go bigger, a stroker crank can be had to give you a 445:
www.ScatCrankshafts.com
https://www.ford-trucks.com/forums/2...questions.html
Remember, to make a 390 into a 428, you need the bigger bore, and you need a longer stroke. So, do what Ford did. Just add the stroke. With the stock bore, it's the 410 from '66-7 Mecurys.
Best to have the thickest cylinder walls you can anyway.
If you want to go bigger, a stroker crank can be had to give you a 445:
www.ScatCrankshafts.com
Thread Starter
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Senior User
Joined: Apr 2007
Posts: 100
Likes: 1
From: Nashville, TN
alright ill probably have it sonic checked, my reason for this question was I was wanting to turn my true 428 into a stroker/roller motor and take all my brand new parts and put them in a 390 thats bored so I dont loose money in them and the 390/428 would be goin in a 78 bronco but now Ive been told its hard to put a 390 in a 78 bronco that a 460 would be easier and i have one of those also so i dont know. Decisions Decisions
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