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Head Off Rb25t

skidkid

By skidkid,
in Engines & Forced Induction

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skidkid Proficient

skidkid

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Posted (edited)

I got the head off our 98' Stagea yesterday to replace blown head gasket (80k). While the head is off I thought its a good time to give the ports a tickle. Are people match porting out to gasket sizes on both inlet and ex. or just make sure gases are not hitting a shoulder? Are people removing lump in exhaust? Also are people replacing head bolts??

Edited by skidkid
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Dale FZ1 Veteran

Dale FZ1

Posted
Posted

I found the R33 spec factory manifold gaskets pretty well matched already, but checked and touched up both sides where necessary.

That lump in the exhaust port I smoothed out the sharp leading edge considerably and blended them in to the overall port shape.

The short radius in each port, leading onto the seat was where I spent a fair bit of time. Ex-factory that really was an abrupt edge and needed work.

Overall, not much material taken out but quite a bit of finishing work that the factory doesn't do. I'll have an idea later this month if I'm happy with my work :D

New head bolts not essential, but aren't expensive and should be replaced if the engine will see a bit of work.

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