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#1
12-03-2025, 02:17 PM
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ID Help
I recently grabbed these manifolds on sale and am confused what year / application they may have been for. I have read conflicting information on the part number and years, and the head-to-manifold flange bolt count, for those years. Hope that makes sense.
It appears they are RA3 GTO manifolds from 1969 (per Wallace on the RA / HO manifold descriptor sections). See below and attached pic. http://www.wallaceracing.com/exhaust1.htm .............but then it also shows the same part number used in 1970 on the broader Wallace listing. See below. http://www.wallaceracing.com/exhaust.htm I have also read the 3-bolt head flange was only utilized in 1970. So, are they 1970 GTO RA3 manifolds?
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79 Trans Am WS6 71 Formula 72 Formula 71 Firebird 69 Firebird Last edited by hojs69; 12-03-2025 at 02:21 PM. Reason: pics |
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#2
12-03-2025, 02:23 PM
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More pics (reached limit of 5)
Thank you
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79 Trans Am WS6 71 Formula 72 Formula 71 Firebird 69 Firebird |
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#3
12-03-2025, 03:22 PM
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To further clarify, these were NOT bought on this forum and I am VERY happy with my purchase regardless what they are. There is no conflict in play.
I simply wish to know the origin.
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79 Trans Am WS6 71 Formula 72 Formula 71 Firebird 69 Firebird |
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#4
12-18-2025, 11:35 AM
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the casting numbers to me look like oem - the repops carry casting numbers but depending on the source often have additional details like three bolt flanges on both sides...
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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#5
12-18-2025, 05:40 PM
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Yes, the casting appears OEM.
The idiosyncrasy is the 1969 part numbers on a supposedly 1970 only 3-bolt head flange layout.
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79 Trans Am WS6 71 Formula 72 Formula 71 Firebird 69 Firebird |
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