Major turmoil over at the Ford camp is causing major changes as I'm sure you can imagine. As of now the 5.0L/4V revised Modular based engines used in the '10 Mustang GT will have direct injection (but not initially), VVT, a revised aluminum block with longer sleeves to accomodate the longer stroke, a and 3.6X" bore. Weight reduction is also part of the new Stangs future. Expect the new GT with 5.0L to check in around 3550-3600lbs. Ford is also testing a twin turbo version of the 5.0/4V motor though production is doubtful. A version of the N/A 5.0 4v is also being tested for duty in the F-series. Making 360hp it will tuned more for tq than HP. 6.2s Boss V8s are now relegated to truck only duty. As for the Boss line of engines, they are 2V/OHC iron block, with plans for an Al version, displacements ranging from 5.8-7.0L, possibly 4V heads, and twin turbo versions are being tested. The Fe block weighs 211 pounds and will definitely be used in the F series. It has 102 mm (4.015") bores on 115 mm spacing. It does NOT have siamese cylinders. It DOES have under piston oil squirters. The main journals are ~ 75 mm diameter and the bulkheads are pretty thick. As for bore/sroke that's approx. 4.015"x3.73" for the 6.2.