I was really hoping to find some, but I looked at Hooker, Hedman, OBX, Dougs, MadDog, Flowtech, Patriot, and then Tin Indian and KRE hoping to find some but it seems they don't exist. D ports yes. Round ports no.
Hedman makes the 35130-6 that Summit says will fit a 73 GTO, but the Hedman Website doesnt agree.
https://www.summitracing.com/parts/hed-35130-6
That'll take a phone call to find out Hedman is probably correct.
Jegs has P/N 555-30065...but while the description says "Cylinder Head Port Shape" is round, it goes further to say it will NOT fit Ram Air cylinder heads. Likely a D port.
Now you can understand why I had mine made.
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Mark S
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Who needs nice and pretty, when you can have mean and nasty?
KRE Aluminum headed 463CID 73 LeMans. Used to run 10.6x @ 124.55. 3700lbs
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So much for 2020...shootin for 9s in 2021...and in 2022 apparently.....and 2023....and 2024.....and 2025.....who am I kidding? there will be no 9s with this engine!
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My 73 Build thread