Comments by "mpetersen6" (@mpetersen6) on "Breaking down our Jeep 4.0L stroker mod" video.

  1. You won't get much compression with a 4.2 (258) piston in a 4.0L block. The bore is .125" bigger. This may be outrageous to some but if I were starting with a 4.0 I'd go the other way. Open the bore up as much as possible*. And destroke the motor by going to a 199 crank. Appropriate rods and piston. Custom cam. Need the custom cam because the head would get replaced with a new head built from two donor aluminum Windsor, Cleveland or LS heads for a crossflow head. Use a cam profile similiar to the Boss 302. The object would be to build a high rpm screamer. Back it up with a six speed transmission. Drop it in say a Rogue hardtop with IRS, new front suspension and a few other tricks and go hunting Beemers. Or use it for autocrossing. *take one block to the maximum overbore and another to 4.0" using sleeves welded or silver soldered in place.
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