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WagonDan Offline
#1 Posted : Tuesday, 6 February 2024 3:21:41 PM(UTC)
WagonDan

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Hey fella's 🤟


I've recently picked up some NOS Holden exhaust pipes and included were the 2 pipes below -





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 👌
HK1837 Offline
#2 Posted : Tuesday, 6 February 2024 4:12:34 PM(UTC)
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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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WagonDan Offline
#3 Posted : Tuesday, 6 February 2024 6:14:53 PM(UTC)
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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.
HK1837 Offline
#4 Posted : Tuesday, 6 February 2024 7:29:53 PM(UTC)
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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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WagonDan Offline
#5 Posted : Tuesday, 6 February 2024 7:35:45 PM(UTC)
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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?
HK1837 Offline
#6 Posted : Wednesday, 7 February 2024 5:59:39 AM(UTC)
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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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HK1837 Offline
#7 Posted : Thursday, 8 February 2024 6:09:34 AM(UTC)
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A forum member sent me this. Item 13 is the V8 RH pipe you have.

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If we all had the same (good) taste, who would buy all the Fords?
 1 user thanked HK1837 for this useful post.
WagonDan on 8/02/2024(UTC)
WagonDan Offline
#8 Posted : Thursday, 8 February 2024 9:45:44 AM(UTC)
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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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