What kind of headwork? A good service and valve job should do the job just fine.
Bigger t/b and intake manifold will help.
Any kind I guess, unless it was going to make a day & night difference with performance.
Based on what i've discovered these cams should yield some noticeable gains and still remain fairly reliable and close to stock driveability. They're only slightly more agressive than CTR.
My plan now is to install the cams with the springs, some adjustable cam gears, an ITR intake manifold & throttle body and then tune.
My goal of 105-110kw peak with more midrange, the 4.9FD and in the light EG shell...... should be happy days.
I don't think you'll need a new TB or IM, they will breathe fine if you give them a hard clean with some Suburu engine cleaner, will breathe like a new car.
As for head work it's not necessary but I think the whole idea lots of people have is that if you're going inside the head you may as well do everything at once. Especially if you're going to mod it again, because you may as well get it tune'd once it's all done inside, rather than going piece by piece.
Hmm.. I just googled the Subaru engine cleaner... looks interesting. Where would one buy such a thing?
In terms of the headwork, I’m thinking the head won't need to come off if I’m just replacing the cams & springs. With the right tools they can be installed as is from what I understand. Should be relatively cheap labour wise (I hope).
I'm still gathering parts, so will be a short while before I have them installed.
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