do i need to bore for 416 or 426

[400EXracer74]

do i need to bore my engine so that a 426 or a 416 kit will fit?

[UglyMotha™]

yup, 416 is an 80 over bore and a 426 is a 120 over

[416exrider]

Yes you do I would go with the 416 if i was u the 426 runs alitte hot but if your just going to race the 426 is better

[04'400ex'er]

Yuo bore the stock sleeve for the 416 and im not sure if you can bore the stock sleeve to 426 or if you have to buy one

[UglyMotha™]

stock sleeve for both