Just saw ford is offering these bare blocks for Sn95...so far this is what I know, iron block, need a machine shop to get it to your specs, you can make it to a 5.4 stroker, siamese bore, distributes cooling efficiently over the 4.6 design....anyone has any experience or knowledge about these motors? Im in the process of ordering a shortblock and head upgrade, teskid 298 4.6 stroker with stage 2 cams springs and valves..i still have time to change my shortblock, seeing if its worth the money, reliability, and horsepower.