RB25 stock intake manifold be bore or ported out and polished?

Discuss the RB20, RB25 and RB26 series engines.
exodus5547097
Posts: 363
Joined: Mon Jan 08, 2007 6:56 pm

Post

Can a machinist bore and port and polish the stock RB25 intake manifold, so it can flow better? At what price? what you guys think?


Joe
Posts: 6511
Joined: Sun Feb 09, 2003 8:29 pm
Location: Phoenix, AZ

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im sure it can be done, but there will be little to no benefit.

NA motors benefit way more than boosted ones with that kind of mod.

Cjmartz2k
Posts: 1845
Joined: Sat May 19, 2007 1:39 pm
Car: Hunting for a '89 GTR now
Location: Okinawa, Japan

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I was thinking about trying to get one extrude/honed if I ever take one of these motors back to the states.

rb25drag
Posts: 1311
Joined: Mon Sep 24, 2007 9:51 am
Car: 1990 Nissan 240SX 5.3 Chevy + 60mm turbo + blow threw carb.

Post

Yes it can be done, But to get any benefit you will need to match the port with your head, Also with it being boosted, Your not going to see ALOT of difference. Possibly a Quicker rev, and less lag with a Biger turbo setup.


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