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Mkol · Joined: 04 Aug 2023 Posts: 30 Location: uk

Hi all, im scavenging for more experienced opinions on things im finding on my engine refresh..!

pulled the head today and found some damage on the valve seats pictured, how worried/concerned/totally bummed out should i be about this!!

peterld · Posted: Thu Jan 25, 2024 9:17 pm Post subject:

Very!

Has to be fixed. Period. Or find a replacement head.
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80/81 932/8 ROW

Mkol · Joined: 04 Aug 2023 Posts: 30 Location: uk

Thanks, thats a pity, it was all going so well!

could you give me any guidance to what could be done to rectify it?, im new to head work so learning every day..

many thanks!

Kenodog · Joined: 25 Jun 2003 Posts: 2651 Location: Vancouver,B.C.

You find a replacement head, they are cheap and plentiful. Welding unknown aluminum that has been heat cycled and impregnated with oil over the last 40 years is sketchy at best.

Me
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1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

safe · Joined: 18 Mar 2017 Posts: 588 Location: Sweden

Agree, get a new head.
It could be fixed, but it would be way more expensive.

Don't just throw away the old head, at least save the valves to see if they are reusable. Most valves I've removed has been trash, so finding a usable set is nice. (I scavenged three heads to find enough for one head I rebuilt)

There are reproduction valves available now.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe