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The Rb25de Head Reco/port/polish Pics.

Cubes

By Cubes,
in Engines & Forced Induction

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Cubes Grand Master

Cubes

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I used a R32 GTS RB25DE motor. All the RB25DE R32 Motors are Non Variable Cam timing and have Top Feed Injectors.

Measure your ports from side to side.

The width of my intake ports are 50mm and the height is 32mm.

The width of the exhaust ports are 50mm and the height is also 32mm.

What head did you use? VCT?

adam 32 Grand Master

adam 32

Posted
Posted

when i had my head off to replace a valve and it was in at the head-shop they said that porting and polishing wouldnt have been financially justified as the head already flowed very well. this was for an RB20 head tho - did they expect gains from porting and polishing the RB25 head?

also did they ever consider changing the valves at all? i know the guy wanted to put CA18 exhaust valves in my head but i didnt want to take the gamble :D

Cubes Grand Master

Cubes

Posted
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He said not much work needs to be done to the RB25 head.

Deshrouding the exhaust valves and working on the bowl area in the exhaust valves is the most you would really want to do to it other wise the price goes up and the performance per $$ ratio goes way way down. Anything to improve the exhaust flow in a turbo motor is a good thing.

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