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tyfighter123 · Joined: 19 Jan 2010 Posts: 551 Location: Colorado

Hey everyone, I have been rebuilding my car for the last 2 years now, chipping away at it slowly piece by piece. I am at the end of the rebuild proccess. I finally got my cometic head gasket and installed the head last night. The head is from a 77 california car that had the EGR/Smog pump installed on it. I had the big valve job done on it and had it port matched with the intake. I discovered something I didn't know before, the head has small holes drilled all the way through it from the intake side on the exhaust valve. Has anyone noticed this before on the california cars?

My question is what should I do? Leave them there or plug them? I thinking plug them but how should I go about doing that?

I hope this makes sense.
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Porsche 924 1977 N/A
Mustang GT/CS 2007
Porsche 924S 1987 (parts car)(cut up and recycled)
Porsche 911S 1976
Porsche 931 1980
Porsche 931 1980 (parts car)

morghen · Joined: 21 Jan 2005 Posts: 9102 Location: Romania

it does not, take pictures.

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Supercharger and EFI kits
https://www.the924.com

Joes924Racer · Posted: Thu Aug 23, 2012 5:35 am Post subject:

Yea they do... I left mine alone.
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1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

MikeJinCO · Posted: Thu Aug 23, 2012 12:08 pm Post subject:

I think I saw those holes, There is a channel cut into the head down below the intake ports which has I believe some cross the head holes that fill up the channel with exhaust soot. It looked like an attempt to warm the incoming air to improve the combustion efficiency, manufacturers tried a lot of that type of thing back in the day. I just left mine alone also, I believe the intake manifold gasket blocks them off.
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Mike

'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)