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Anyone?



I don't think that you can bore the motors out a whole lot. There is a 4.2L stroker kit out there somewhere, mostly in Australia I think.
 
Yup...it bores it to 4.25 liters...but the kit is somewhere in the neighborhood of nearly 4 grand. You can do DIY turbo build for less than that...OR...probably a solid low 12 sec M90'ed car.
 
ok thanks, only reason i ask is because at we school we got to the chapter of cams and pistons and all that and we had to solve equations for boring a 5.0 mustang so i thought bout our cars
 




about as much fabrication as it would be to bore out a 3.8 to a 4.2 block. probably less because motor mounts are easy.
 
Not sure if it helps any, but mine's bored .020" over, and I don't think there was much of a difference between that and stock size. Of course, I can't really tell that well, because I raised the compression to 9.5:1 as well as fully rebuilt and balanced the motor.
So, unless you're planning on changing to a set of aftermarket pistons and doing a full rebuild, I don't think it's worth it just for the slightly increased displacement.
 
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