HSR 42 or 45?

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#11

01-23-2023 | 01:27 PM

Max Headflow

Seasoned HDF Member

Joined: Dec 2005

Posts: 17,466

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From: poway

Quote:

Originally Posted by SwedishMeatball

Thanks for your reply. I don't know any flow numbers for these heads, they have 1.940" intake valve, and the intake port is 45 mm where it meets the manifold, compared to 42 mm for my stock heads.

I have a matching S&S manifold that is 45 mm where it meets the head and around 51 mm at the carb side. I can fit both 42 and 45 mm carbs using different rubber seals.

45mm is like 1.77".. You can pretty much use a G manifold or an HSR45 from Ultima or SnS. Make sure to check the port size so it matches.. Google shows up a bunch of ones..

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#12

01-23-2023 | 02:01 PM

SwedishMeatball

Thread Starter

HDF Community Team

Joined: Jun 2022

Posts: 636

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From: Stockholm

Quote:

Originally Posted by Max Headflow

45mm is like 1.77".. You can pretty much use a G manifold or an HSR45 from Ultima or SnS. Make sure to check the port size so it matches.. Google shows up a bunch of ones..

I think it is a G manifold but with the mounting flange machined down to a circular flange like on the stock manifold, but bigger.

Manifold and ports are the same size and they match very nicely.

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#13

01-23-2023 | 02:40 PM

60Gunner

Grand HDF Member

Joined: Sep 2017

Posts: 4,359

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From: Dubuque, IA

If you're interested I have a dealer kit of jets, needles and the next size bigger needle jet. Forget the number off hand and I'm at work. The needle jet isn't isn't all that readily available. A few different accelerator pump nozzles too.
Fits the 42 or 45.
I would go with the 45 in this case.

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