Head oil drain valve

Discuss the RB20, RB25 and RB26 series engines.
Vet4Speed
Posts: 1
Joined: Sun Jan 19, 2020 9:20 pm
Car: Nissan 240SX w/ an RB25DET

Head oil drain valve

Postby Vet4Speed » Mon Jan 20, 2020 2:09 pm

Ok so this might’ve been hit up before or maybe it hasn’t but I’m trying to find out a couple of things. One: for the people who’ve dropped RB25’s into a 240SX and have attacked the oil return issue by installing an oil drain valve in place of the freeze plug on the back of the head, is anyone having clearance issues with the valve and the firewall and how have you rectified this? And 2: On top of installing the extended crank collar do I need to replace the OEM oil pump with an upgraded one? I want to make sure I don’t run into any issues at higher RPM’s.


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