[TR]

Hey I was wondering if any gurus out there could ID what year/car/application is for some hi-po "D" port manifolds I found...to see if they're suitable for my 4 speed '71 GTO. -- The left manifold has the # 8791837--- and the right manifold # is 9797072-8. The differences in number type lead me to believe this "set" may be from different years. Am I correct? Any info would be greatly appreciated. Thanks, Tom

[TR]

Hey I was wondering if any gurus out there could ID what year/car/application is for some hi-po "D" port manifolds I found...to see if they're suitable for my 4 speed '71 GTO. -- The left manifold has the # 8791837--- and the right manifold # is 9797072-8. The differences in number type lead me to believe this "set" may be from different years. Am I correct? Any info would be greatly appreciated. Thanks, Tom

[Kurt Zimmerman]

Tom,
While I'm certainly not in the same "guru" league as some of the other guys on this board, I do have a pretty decent reference library if anybody needs something looked up.

Your 9797072(RH) is a 69 Ram Air III manifold (quite rare) The match for it would be 9791637(LH)

The standard d-port manifold for 71 was 490142(RH) and 490143 (LH)

I couldn't find any info on 8791837.

D-port manifolds are interchangeable (except 307) from 68-72. The left side won't fit 67 and older because of frame interference.

Hope this helps you out.

Kurt

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Global Warming? Yeah, since the Ice Age, Al

['ol Pinion head]

TR,
The LH manifold you have must be a '68-69 LH D-port A-body RA manifold. The 1st number should be a 9 & the latter 8, a 6. These are often hard to read after many years of useage, you can also ck for a date on the manifold back side. It may still be legible.

These lh 68-69 or 70 D-port factory manifolds are worth fixing if cracked or warped. They are esp useful on '70 1/2-74 Firebirds as the commonly available repro has a clearance problem with the Z-bar (countershaft) on these later Birds. You should have no problem with these fit wise on your '71 GTO...Good luck from another '71 owner.

[TR]

Thanks for the info guys....I really appreciate it. Your right though that I must be mistaken about the LH one. It probably does start with a 9 rather than an 8--it never occurred to me that the first 3 numbers would've matched that way. Does that number ( 9791837 ) cross with any references? I'm glad I found them and will definately use them...I bead blasted them and they look much better now.

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'71 GTO 400 4 speed.

[Kurt Zimmerman]

Tom,
Ol'Pinion Head is right on this...if you check your 5th digit on that LH manifold, it's probably a 6 instead of an 8, that would mean that you have a matched set!
In other words, the LH one is probably 9791637, not 9791837
If it is, you're golden!
Good luck
Kurt

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Global Warming? Yeah, since the Ice Age, Al