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HK 307/327 Exhaust compatibility.
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Joined: 24/11/2021(UTC) Posts: 46 ![New Zealand New Zealand]() Location: Auckland Thanks: 4 times Was thanked: 6 time(s) in 6 post(s)
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Hey fella's 🤟 I've recently picked up some NOS Holden exhaust pipes and included were the 2 pipes below - ![](/Forum/resource.ashx?imgprv=1111) ![](/Forum/resource.ashx?imgprv=1112) ![](/Forum/resource.ashx?imgprv=1115) ![](/Forum/resource.ashx?imgprv=1114) ![](/Forum/resource.ashx?imgprv=1113) 7448881 - HK 307 Eng RH 2808619 - HK 327 Eng LH (early number is 7449065) What difference would there be between 7449065 (early 327 LH pipe) and 2808619 (later 327 LH pipe)? Perhaps a difference in the LH manifold, or resonator size? Also, in theory would the 307 RH pipe fit a 327, where a resonator could be added to make it "correct" for 327? Appreciate your feedback 👌
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I can't remember exactly what and if anything changed with the 327 exhaust - it may just be a part number thing where numbers change and bits aren't exactly what was fitted originally. There is a fair bit of that stuff happening by the time the blue HK book was published in 1972, it's full of furphies. It may be a real change though, I just can't think of what might be different - maybe HT style resonators.
The 307 exhaust is for a single system so will be nothing like a dual system for a 307/327. Don't waste it, hang onto it and buy the right dual exhaust bits from someone like Settlement Road Exhausts.
I wouldn't use that old dual system resonator either, it's a museum piece. It's probably all shagged inside. |
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The 307 Pipe is for a single system?
Where do the 2 engine pipes join together? I would have assumed they joined far closer to the engine, near the gearbox bellhousing etc.
I couldn't find any undercar pictures of 307 single exhaust systems, but would love to see how they piece together.
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Yes. It was possible to option N10 (dual exhaust) on all HK V8 except Brougham, but as so few cars were actually Retail Order they are virtually non-existent. N10 on a 307 was simply the 327’s exhaust. There would have been plenty of new systems sold through Nasco and later GMP&A to fit to HK V8. I’ll see if I took photos of my HK GTS before I took its exhaust off, it still had an original system on it. It is two pipes into one and just the 186S system back. |
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Ok, that'd be great thanks 👍
Just to throw another question out there, a close friend has an HK Premier Wagon, 307, Powerglide etc.
The "front pipe" that came off his Wagon (currently under resto) was a 2 into 1 Y pipe which joined very close to the engine itself.
Would the 307 pipe I have here, therefore be the "factory correct" RH pipe for his Wagon?
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Still looking for the photos.
If that pipe is labelled correctly then yes it will fit his car. That pipe on all V8 HK (and I think 5litre/307 HT) is the same other than of course GTS327 and those few V8 cars optioned with N10. |
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A forum member sent me this. Item 13 is the V8 RH pipe you have. ![](/Forum/resource.ashx?imgprv=1116) |
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Well there's the proof, thanks very much!
If anybody has a picture of a single system fitted to a vehicle, I'd be keen to see that also 👍
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7449065 was the LH 'pipe and resonator assembly' it was superseded by 2808619.
I think the resonators were altered in some way because their part number was superseded from 7449062 to 2808625. The LH RH intermediate pipes were also superseded at the same time.
I don't know what else changed, did type 1 327's have an exhaust heat riser valve?
Wayne
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HK 307/327 Exhaust compatibility.
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