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Engine number is cast on the back left hand corner (roughly underneath the turbo) it will tell you what block it is.

Head casting is front left near exhaust runner 1.

Also RB20 head won't go on to RB25 block as the chamber/bore size is different.

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4 minutes ago, iruvyouskyrine said:

Engine number is cast on the back left hand corner (roughly underneath the turbo) it will tell you what block it is.

Head casting is front left near exhaust runner 1.

Also RB20 head won't go on to RB25 block as the chamber/bore size is different.

What does cast number 08U identify the block as? And I have read this about the 25 and 20 not matching up.

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