Following on from our "Frankenstein 2J RB" a few weeks ago, we flew to Adelaide to speak to Darren from Bullet Race Engineering about what makes a billet engine better, and at what point you might consider one over a standard cast iron block.

While we were there we got a factory tour and watched some billet 4G63's being milled up.

Huge thanks to Bullet for taking the time to show us around!