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Original Message
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| RE: Largest bore for a 390 engine? |
| By Kevin66 - 04/04/2002 9:02:44 PM; IP 207.102.191.72 |
Maximum bore size depends on how good the cylinder walls are. Have any block under consideration sonic tested before considering maximum overbores. Ideally, you'd want about .150" left, at least on the major thrust faces. Some builders consider .120" to be okay.
No, you won't get out to the 427 standard bore size of 4.233"...that's .180"! You can frequently open them up to the 406/428 bore size of 4.13" however, which is .080". Almost all blocks will safely go .060" at least.
It's actually easier to gain displacement by stroking these motors. Using the 410 Merc or 428 Ford crankshafts, you can get out to anywhere from 416-428 cubes. Just use 410 pistons in the oversize of choice. |
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