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Tech Question
Paul Wooten, Spring, TX, 1968 Dodge Coronet 318
I have a 1972 400 HP. What is the maximum bore I can go with. The block has been bored .040 over and needs to be re-bored (probably .060). Can this be done and if so, where can I get pistons to fit? All I can find is .040 over pistons. Any help would be greately apreciated.
Paul,
As you probably know already, the factory called for no more than 0.040" O/S. And, the more you bore, the more you weaken the cylinder walls. But some of these blocks had amazingly thick cylinder walls, so I'd say sonic test 'em - a very quick and inexpensive process. Look for at least 0.100" on the major thrust side. More is better!
Failing that, 400 blocks are pretty easy to find.
Assuming the 0.060" bore job, any of the California piston houses - JE, Probe, CP, Arias, etc. will happily make you whatever bore and squeeze you desire - with lots less weight, and more strength, to boot.
Rick
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