Add 273's, 340's & 360's to the "318 Race" ?

The X block is a race block that can come in a verity of bores starting with a low of 3.91 up to 4.185. Or 4.22.
The 4.185 x’s 3.31 = 364. X 3.58 = 393, x 4 =440, 4.125 = 453, x 4.25 = 467.
4.22 x 4.25 = 475.5.

Yea! It’s just a 318....

X blocks are not cheap.

Core 360’s LA or Magnum are easy to get and cheap by compare.