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Discussion Forum
:

WD Intake Manifold Port Diameter

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Jeff (IA)

06-25-2000 11:07:07




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Does anyone have a WD intake/exhaust manifold laying around that wouldn't mind measuring the intake port diameter for me? I am very curious to know what this diameter is. Thanks J




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Brian G

06-25-2000 16:54:49




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 Re: WD Intake Manifold Port Diameter in reply to Jeff (IA), 06-25-2000 11:07:07  
1-3/8" and the Exhaust ports are the same size.



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Jeff

06-26-2000 03:54:40




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 Re: Re: WD Intake Manifold Port Diameter in reply to Brian G, 06-25-2000 16:54:49  
Brian:
You sure this is the intake manifold port dia. The cylinder head is 1 3/8. I measured the intake on my WC and it is 1.114 rather small. A lot of the old timers tell me that a manifold off a WD will perk up the WC a few horses due to the better breathing manifold. I am thinking of boring out the intake ports on my manifold so they are more port matched to the cylinder head. I hope this won't reduce my velocity at low rpm.

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Brian G.

06-26-2000 11:03:38




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 Re: Re: Re: WD Intake Manifold Port Diameter in reply to Jeff, 06-26-2000 03:54:40  
I measured the WD-45 manifold last night by mistake. It was a little dark in the back corner of the barn at the time. The "original" manifold for the early WD (with "short" head) does have 1-1/8" intake ports. However, it does have 1-3/8" exhaust ports. Incidentally, both the intake & exhaust ports in the "short" head measure 1-3/8" as they do in the "tall" head. Probably all the aftermarket exhaust manifolds are made to fit either WD or WD-45 and they probably have 1-3/8" ports throughout but I don't know that for a fact. The WD-45 and some aftermarket manifolds do have larger throats at the carb side to accomodate the larger carbs used on the WD-45s. Sorry about the previous misinformation! Brian G.

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Brian G.

06-26-2000 08:34:04




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 Re: Re: Re: WD Intake Manifold Port Diameter in reply to Jeff, 06-26-2000 03:54:40  
Yep, This intake/exhaust manifold is off an early WD which had the "short" head. I would have thunk that it would be the same as a WC?! Now I didn't use an inside micrometer; just my trusty old tape measure, but 1-3/8" is as close as I could measure. Brian G.



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