I think your formula is off... Assuming that same formula applies to all engines, that would make my 4.6 a 285, and i know it's a 281.
A 4.9L 302 would be a 303 according to that formula.
A 5.8L 351 would be a 359
And no, its not called a formula, its an equation.
Same deal
Would that make the 4.9 correct at 4.9 or is it really a 4.8? Man those 302 guys are going to hate this