Re: What is the largest over bore you can go on a 402
The motor will go into a street driven car. It is an original warranty replacement block. I have not considered sleeving the motor but that may be choice because I would hate to toss the motor aside and not use it in something. The .090 over pistons are made locally here in Huntington beach and I was told that they are about $800.00 for a set versus a little over $400.00 for a set of off the shelf pistons. I kind of like the idea of going to the 4.250 bore (.125 over)and I have read that it has been done but I do not know of anybody that has done it for the street. I have a set of 990 open chamber steel heads. I thought I could build a L-88 style motor that has the look and casting numbers of a L-78 402 under the hood but have more power.
Mark Sheppard
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