Ram Horn Manifold Differences - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**rechinca** · 11-23-2018, 10:11 PM

As I am shopping for a replacement rams horn manifold for my truck, I have a questions I really can't find good answers for. The current LH manifold in my '71 is a 3989055 and I am having a hard time finding a replacement with the same number. What I do find are a lot of 3932473 manifolds. Both are the angled back dump, but I can not seem to find any more info out there.

From what I have been able to determine is:

3989055 - 69-72 307, 350 & 400 LH

3932473 - 69-70 327, 350 & 400 LH Passenger 235, 250, 255, 265 & 300 HP 2.0" Outlet

So is there any difference, and if there is, what is the difference?

11-23-2018, 10:11 PM	#1
rechinca Senior Member Join Date: Jul 2018 Location: Vacaville, CA Posts: 529	Ram Horn Manifold Differences As I am shopping for a replacement rams horn manifold for my truck, I have a questions I really can't find good answers for. The current LH manifold in my '71 is a 3989055 and I am having a hard time finding a replacement with the same number. What I do find are a lot of 3932473 manifolds. Both are the angled back dump, but I can not seem to find any more info out there. From what I have been able to determine is: 3989055 - 69-72 307, 350 & 400 LH 3932473 - 69-70 327, 350 & 400 LH Passenger 235, 250, 255, 265 & 300 HP 2.0" Outlet So is there any difference, and if there is, what is the difference? __________________ 1971 Custom/10 - 350/3 speed, Orange/White roof



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