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Old 02-16-2004, 08:15 PM
Michael C Henry Michael C Henry is offline
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Join Date: Mar 1999
Location: TACOMA, WA
Cobra Make, Engine: Everett Morrision FE 427 so 2-4s
Posts: 2,008
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A 390 is 4.050" .075" over makes it 4.125" that is stock fot 406 and 428. I bought a 406 in 68 and rebuilt it with a.040" over bore and new pistons.I have had 428+.040" same pistons in two different blocks. Weak walls and ring failure were never a problem.
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