Alright I'm in need of a Rb guru. The machine shop I brought my Rb25 block to , punched out these plugs in the block to fully clean it. Now it's not any welsh plug, it's an iron plug either for oil or coolant. It goes straight through the block and there is 2 plugs, the front port is by the bottom large bolt on the water pump and between the oil pump, the back port is right above the rear main plate on the intake side.
If anyone knows where they can be sourced it would be very helpful!
My last option is to have a machine shop lathe me up two plugs but if they sell them it would make it easier. Thanks!
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