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can some1 please tell me what each hole on the intake side of the rb30 block is for and what i do and dont need?

i am not having a heater,aircon.

also i have a greddy copy plenum, what are the front 2holes for? also there is about 5holes and the back of the plenum?

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A: - That goes to the heater core.

B: That is the rear knock sensor

C: This is left empty

D: This is the front Knock sensor

Blue Circle: This are for both of the water sensors. Beware - The single plug sensor is usually the wrong thread. You can either cross thread it in or re-tap it.

Green Circle: If you plan on removing the water to oil cooler, use this to put the oil temp sender in. If you keep it, there should be a bung in here.

Edited by The Mafia

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