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Old 02-21-2008, 02:19 PM   #1
FuJi K
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I'm finishing this motor build with new gaskets seals etc for my dad's Outback. I decided maybe I should port it out too! There are Delta cams in it and I'll be running the OBX Headers on it. This is going into our '00 Outback. Figured why not make it have some more grunt since it's so heavy!

I'm just working on the intake side. IF I had extra time (lolz) I would take the head apart and work the step and polish the exhaust side but I have to get this car running so I can drive it since mine is down. I only wished our SOHC manifolds has BIGGER intake runners like the WRX. I guess it's small for NA applications....*sigh*


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Old 02-21-2008, 09:12 PM   #2
FuJi K
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Here's the finished product. I didn't make it pretty like how aftermarket heads are. Shiny stuff sells I know. It doesn't take much to make it shiny anyways....hahaha

STOCK one at the end
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Old 02-21-2008, 09:50 PM   #3
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Have you just done this to a set of heads and done nothing else? What have you felt power wise from doing this?
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Old 02-21-2008, 11:48 PM   #4
FuJi K
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Quote:
Originally Posted by cueball89 View Post
Have you just done this to a set of heads and done nothing else? What have you felt power wise from doing this?
My nephew has done this to his '00 RS. Although the work he's done isn't as clean like mine, he states there's a good amount of response and some grunt to it. His car is just modded with cone filter w/ '93 intake pipe, and MRT catback. He talks a lot of BS so I'm not so sure.

Well...the thing is, the 2.5L SOHC heads' port runners are pretty decent from factory, unlike the USDM WRX heads. I'd say this helps with higher RPM where airflow into the port is improved. I've YET to see how it performs, but I never got to drive the Outback STOCK. If I have spare $$$ this spring/summer, I can go dyno it and see what it puts out. There'd be MORE gained if the step was smoothed as well as the valve throat, polishing and smoothing out the exhaust side. Putting a WRX manifold will give it some to gain as well as the runners are larger, but this would be for PEAK power i.e. higher revs.
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Old 02-21-2008, 11:53 PM   #5
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Nice work. Cams and headwork are the next logical step in N/A after you go through the usual bolt-on list.

There should be some nice gains there. I think around the neighborhood of 25-35bhp when paired up with the intake and header and exhaust.
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Old 02-21-2008, 11:58 PM   #6
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It'll also be a very nice sounding BH Outback.
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Old 02-22-2008, 12:06 AM   #7
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which delta regrinds did you get btw?
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Old 02-22-2008, 12:36 AM   #8
FuJi K
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Originally Posted by rougeben83 View Post
which delta regrinds did you get btw?
These are the more aggressive cams. They are said to be a little lumpy at idle. I only wished the Outback's manifold was bigger. I need to find an intake for the Outback, should I just buy an air filter and put it on the throttle body?

The Outback's original motor has belt valves I think. The pulley next to the water pump failed and the timing belt slipped. This motor that I'm working on is from a local guy's '01 RS. He's doing a FXT swap w/ STi harness and ECU. I figured it'd be less of a hassle to just swap out the motor, BUT I find out that the '01 2.5L SOHC motor needs a little bit of work; rear main seal, and HG becasue of leaky oil.

I'm thinking of selling the Outback's original motor to my AutoTech teacher as he wants a PHASE2 2.5L for his girlfriend's '98 Outback. This Outback's motor has like 204k miles!!!

EDIT: NOT the WRX's manifold, but the Outback's manifold.

Last edited by FuJi K; 02-24-2008 at 11:11 PM.
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Old 02-26-2008, 01:32 AM   #9
FuJi K
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Here are some pics with different angles of the other set of ports.


ONE DAY, I'll take apart one head and do a FULL PORT. In fact, the OUTBACK's motor w/ bent valves make the PERFECT canidate! That one is acutally going to be sold to my High School Auto Tech teacher.
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