Mine of course!!!!!

Now, Guy is running a CA18 on a CA20 block, has crank fired ignition, FI and 16 valves. I suspect his motor weighs a bit less too, and he's got the trick independent rear suspension... but I've got a ported U20, 11.7 to 1 compression on forged pistons, a cam and Dellortos... should be a good race!

Seriously though, Guy was saying he felt like the car was quicker with the U20, but modern technology is hard to beat. The CA motors are pretty cool.