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Old 04-18-2001, 11:09 PM   #1
Scooby Newbie
Member#: 4881
Join Date: Mar 2001
Location: Shoreline, WA, USA
2001 2.5 RS

Post Port Polish

Has anyone done a port polish on their engine? How much of an improvement was noticed due to that?
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Old 04-19-2001, 01:10 AM   #2
Scooby Newbie
Member#: 5531
Join Date: Apr 2001
Location: Deer Park, NY USA
2001 Impreza
Silver Thorn Mettalic


sorry that im not aiding in your info getting but thank goodness you are helping me. I was wondering the same thing today after my frieds with an Integra GS-R just sent his in for port and polishing. Hopefully feedback will be given. Email with info too please.
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Old 04-19-2001, 05:31 AM   #3
Choke Artist
Member#: 603
Join Date: Dec 1999
Chapter/Region: NESIC
Location: Nashua, NH

Well, there's serveral things that can be ported and/or polished, so you have to specify. One could port and polish: the heads, intake manifold(not really possible on the Subaru), exhaust manifold(also pretty hard on our cars), and on some cars the O2 sensor housing. The most common item to port and polish is the head(s). If you're staying N/A and using stock valves, expect a max gain of 4-5 HP. Not really worth it IMHO.
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Old 04-19-2001, 07:41 AM   #4
Scooby Guru
Member#: 114
Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
'03 Evo, Rice White
'01 Erion CBR 929


I have no idea what the gain was, but you bet it's worth it if you have the skill to do it yourself AND already have the heads off.

I enlarged and polished the intake ports on the cylinder heads to match the intake manifold gasket, and removed casting flash from the intake ports.

Very light modification.
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