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The 427 standard bore is 4.233.
The 428 standard bore is 4.130
The 390 standard bore is 4.050
You cannot reliably turn one into another one - no matter what the guy on ebay claims.
You can however stroke them with good results.
There were so few 406 blocks cross bolted that there may as well be none.
There were so few 427 blocks without cross bolts that there may as well be none.
If you pull the pan take some pics - it'll become pretty obvious.
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP
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