HotRod 2 Posted December 19, 2020 Hey, dose anyone know what the extra possible D and o are on my 351c casting number? Share this post Link to post Share on other sites
bear351c 10,260 Posted December 19, 2020 Lots of misinformation on the 'Net about these being a Boss, 4 bolt, mega rare, etc, etc. Pretty sure its just an American imported block from a Galaxie or F100. Not 100% certain, though. Boss blocks had screw in welsh plugs, not the press in cups, with a big arse square in the centre, and I think the heads had screw in studs for the rocker gear. Anyone know ?? Share this post Link to post Share on other sites