x-block

i can add that it does not have provoisions for an oil dipstick and the cylinder walls are ticker and oblong shaped around the thrust areas.

the oil pan rails were filled for a more rigid bottom end, along with the mains, as mentioned



this one shows the web - and clearance for stroker rod bolts...



they did not come with the 48 degree lifter option of the next gen R blocks, but this block will handle anything you could throw at it.... I think the weak link would be the 4 head bolts per cylinder - as with all stock mopars