All five main caps on the Windsors are crossbolted, but they have dowels between main caps and block instead of the jackscrews that were used for the Romeo blocks.
The bolt pattern for the front cover is the same as it is on the late Romeo blocks, but the two bolt holes just above the pan rail are 10 x 1.50 mm instead of 8 x 1.25 mm.
Windsor has 8 bolts that hold the flexplate/flywheel on instead of 6 like the Romeo.
Romeo has press-fit pistons, Windsors have C-Clips.
Romeo has 11 bolt valve covers, Windsor has 13. Romeo also has "webbed" cam caps, where the Windsor hase individual straps for the cams. The Romeo cams have bolt on sprockets, where the Windsors press on.
2001 Dark Highland Green Bullitt
12.25@110 naturally aspirated on a bone stock 2V longblock
Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon
If it weren't for physics and law enforcement, I'd be unstoppable.