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Old 08-23-2019, 09:50 PM
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Default looking for 1971 455 HO upper rear AC bracket.

hi there. looking for the rear upper air compressor bracket for a 455 HO engine. this is the bracket the dipstick bolts to. thanks! located in Michigan.

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Old 08-24-2019, 10:14 AM
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Is it specific to an HO motor or a specific part number?

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Old 08-24-2019, 10:34 AM
'ol Pinion head 'ol Pinion head is offline
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Quote:
Originally Posted by ponjohn View Post
Is it specific to an HO motor or a specific part number?
only used on '71 & 72 HO engines w factory AC, tough to find part.

Barry had them reproduced several years ago... a faithful reproduction

https://www.ebay.com/itm/1971-72-455...QAAOSwWGtZeh~-

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Old 08-24-2019, 01:26 PM
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Quote:
Originally Posted by 'ol Pinion head View Post
only used on '71 & 72 HO engines w factory AC, tough to find part.

Barry had them reproduced several years ago... a faithful reproduction

https://www.ebay.com/itm/1971-72-455...QAAOSwWGtZeh~-

Interesting.

  #5  
Old 08-24-2019, 01:28 PM
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These were patterned after a original I had years ago and are really nice!

Lyn.
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Last edited by carguy66cars; 08-24-2019 at 01:31 PM. Reason: added to post
  #6  
Old 08-24-2019, 03:00 PM
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thank you ol pinion head. ordered one! awesome!

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Old 08-27-2019, 03:11 PM
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another question though. I see that you could not get ac with a ram air 4 engine, but I believe that the 73-74 trans am super duty would use the same ac bracket, correct? so that would mean the 71-72455ho and 73-74 SD would use this bracket, correct?

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Old 08-27-2019, 04:15 PM
'ol Pinion head 'ol Pinion head is offline
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Quote:
Originally Posted by zeebo View Post
another question though. I see that you could not get ac with a ram air 4 engine, but I believe that the 73-74 trans am super duty would use the same ac bracket, correct? so that would mean the 71-72455ho and 73-74 SD would use this bracket, correct?
No. the 1 1/2" drop aircleaner bases used on '71 & 72 HO cars either had dual snorkels (T/A, non RA 455 HO Formula) or were of the RA aircleaner design (RA Formula & RA HO A-bodies). The passenger side snorkel utilizes the curved dip in the span of the leg of the bracket for snorkel clearance. The 71-72 HO engines also used thicker valve cover gaskets & slightly longer VC bolts (just like a RA4 engine), so the installed valve cover sets up slightly higher, thus the extra clearance needed under the bracket as well. The SD engines were not introduced til late '73 production & they used a drivers side (large mouth) snorkel aircleaner. as a single snorkel 1 1/2" drop base aircleaner, there was no clearance issues on the passenger side.

My belief is the entire clearance issue has to be more related to the valve cover clearance issue, as D-port engine factory dual snorkel 1.5" drop base aircleaners were fitted on '70-73 D port engine Formulas, as well as '73 455 Dport TransAms, & the much more common rear AC bracket was used with these engines (at least on fairly original engines I've examined). Conversely, the '71 dual snorkel 455 HO A-body dual snorkel air cleaners (even though only 1/2" drop base aircleaners) when factory installed on '71 455 HO AC cars, still were teamed with the special '71-72 HO rear AC bracket.

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Last edited by 'ol Pinion head; 08-27-2019 at 04:36 PM.
  #9  
Old 08-27-2019, 06:53 PM
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I used a 70 rear bracket with the 72 HO intake ion my 78 TA but the Shaker base is not close so it worked fine not needing the extra dip.

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  #10  
Old 09-06-2019, 03:53 AM
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ok thanks for the info ol pinion head! I can also say that looking at my d port 1973 intake vs the 1971 factory HO intake, the front mounting bolt boss on the intake is in a slightly different location as well.

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