Article: https://dustrunnersauto.com/4g63vs4...

If you were to look at this from a high level and answer the question of which one is better, the 4G63 or 4G64, it really depends on the specifics. If you're looking at N/A engines, the extra of the 4G64 is great for lowend torque and drivability, but if you're looking at forced induction engines, 4G63T is obviously the answer.

If you're talking about modified engines and which one is better to build for your street car, it's pretty common to see a 4G64 with a 4G63T head and turbo setup, because buying a 4G64 engine is quite a bit cheaper than buying a full 4G63T engine. At the same time, a 4G63T head is pretty expensive, so some people just resort to build a DOHC 4G64 with a turbo strapped to it.

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