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Anyone know how much bigger the z51 radiator is? Capacity?
Considering that the V01 radiator is only 10.5mm thicker I'd say minimal. You don't have one now or suspect not? The core thickness of the V01 is 34mm (1.3") and the tanks are the same as the base radiator. There were many V01 builds, very common option without the Z51 option.
Base 23.5 (.9") V01 34 (1.3") -
An MT original radiator with no AT cooler when referenced separately is sometimes mentioned as the 14.6 "system" capacity and the AT at 14.5. I don't believe I've ever seen a reference to the V01. I've never checked the FSM reference for an early car.