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iTrader: (2)

So I have a GSR head at the shop getting a port job, when the guy calls me and tells me there's some casting flaw or hole in one of the exhaust ports

specifically cylinder number 4 (farthest left from the timing belt) port has some type of either casting flaw or something, that we thought was specific to that head.

we checked another JDM GSR (head in question was USDM) and the JDM head has the same exact "flaw" in ONLY the #4 runner.

Anyone know wtf that is, and why its there?

here's some pics

First, here is Cylinder 3.



Now, if you look, its at the bottom left corner of the port, next to the outermost valve, its hard to get a good pic but i put circles and arrows to help make it obvious.






I have no idea why its there. Its in the casting, there's no plug or inlet/outlet for oil or coolant (why would there be?) ... I was going to have it filled in and continue the port job, just wanted to check up to see what the deal was with this mysterious "flaw".

for the record, we checked a b16 head, and it doesnt have it..

sleeprhatch

nice pics, now my eyes hurt Take some pics with a real camera first then ask questions

Toda Party

iTrader: (2)

philipwight

i am pretty sure it is for egr- that honda was going to have, but ditched because they met the requirment without it.

turbo96wr

you will not have a problem with it.

Toda Party

iTrader: (2)

i think im gonna have the kid flow that port and another one and see what the diference is

non-VTEC

thats a EGR port. its not a "flaw" honda casted the heads like that.

leadfoot78

Yup, my JDM GSR head has that too. I think it was in the first ot the last runner.

dfoxengr

older ls heads have it too