I read that the 993 exhaust head studs are backwards and you need to swap them to make them work with 914-6 headers. Is this true? Kind of nice that the holes are already drilled, so you can move them.
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You could probably leave them in there. That said the passenger side heat exchanger is a bit harder to put on so any room you can save yourself the better. Only 1 side needs to be swapped

Thanks Ben!
What side does do the studs need to be swapped?

Do yourself a favor and put new studs in. Your future self will be happy you did.

It's been way too long but if i recall correctly there were a few spots were McMark opted to use allen bolts instead of studs because we couldn't get a socket on them.

You know I can't recall off the top of my head.

At one point in the early c2/c4 993 days, we actually built the header sets with the Passenger side flip-flopped port flanges @Steve . We obsoleted the special header... and just instructed the installer re-clock the studs to regular 911 location. 993 header on top of box is the (normal 911 flange) Passenger side ; the set on the ground has its header flanges arranged in the 993 flip-flopped fashion.
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Thanks Marty!!

Great meet up with you today @Steve over at the shop, lots of news going on since Rennsport 6 !
Your 3.6L proj will bring many smiles per gallon
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Thanks Marty!! Nice catching up with you today!

Some background between Marty and I. In my early 20's, back in the early 80's, i used to read the VW&Porsche magazine. I drooled over the MSDS hidden Power 1 & 2 articles about Marty's black 914-6 turbo car. As soon as I got out of college in 1986, my plan was to buy another 914, knowing that I was going to immediately convert it to a six. I bought a used 2.7 short block, brand new webers from PMO for $1k and Marty gave me a killer package deal on his 1 5/8" headers, muffler and cross bar motor mount. The rest I bought from Porsche over the counter. Oil tank, lines and tin and some parts from Easy. The car was running by 1987 and I was having a blast in it all over northern California, with some hide speed runs between San Jose and my parents house in Sun City in So Cal.
I met my future wife cruising the avenue in this car in Stockton back in 1989.
In this picture, back in 1989, I was running the 2.7 with Marty's headers, motor mount and muffler.
I have the same car today, but it's now flared, Alaska Blue and future 3.6 with Marty's 1 3/4" headers. Thanks again Marty for the memories and getting me into this hobby!
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Always a pleasure @Steve chatting with you & glad that this 914 avocation has stuck with you !
Imagine back 30 sumptin' years how we got things done without the www, cell phones, cars + coffee, Zoom (your Fave) ; just some local car shows, an article here or there, and a 3 page brochure
See you around the canyons soon

Back in the 80’s when I built my first six all I had was a 914 and 911 Haynes manual. Now it’s all on the web.