Re: Boring out the 237 Packard 6

Posted by Peter Packard On 2016/12/15 19:51:35

I am running 3 9/16 International truck (1600 Series) pistons in my 38 Six, together with 0.125 from the head. Have done so since 1976 without any problems. Goes very well with the R6 overdrive. Also changed out the rear axle from 4.54 to 4.36 ( 120 ). I wouldn't know if the 115 has the same block but it would be getting pretty thin with an 0.125 inch overbore. Good luck. Peter Toet