 2.0L Plenum vacuum port sizes and fitment ? |
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| bdstone914 |
 May 18 2022, 09:55 AM
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#1
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bdstone914  Group: Members Posts: 4,887 Joined: 8-November 03 From: Riverside CA Member No.: 1,319  |
I have found that there is are two different 2.0 plenums. One has a 13mm and 6mm (?) port and the other a 13mm 10 mm ports.
I think the split is probably 73-74 and 75-76. But not sure which plenum fits which years. Attached thumbnail(s)  
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| emerygt350 |
May 18 2022, 10:37 AM
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#2
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Advanced Member Group: Members Posts: 2,853 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
The two big ones are the 73.
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| JamesM |
May 18 2022, 01:07 PM
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#3
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Advanced Member Group: Members Posts: 2,081 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
think I posted about this a while ago somewhere with pictures comparing the two.
There are other differences as well, most noticeable is the width of the throttle cable support. These changes coincide with changes to the throttle body, airbox, and oil tower vent that occurred for the 75my mainly around the crank case venting/elimination of the PCV. But as stated, the one with the 2 large ports and also the narrow throttle cable support is the earlier version. The later (75+) configuration does not use the rubber stacked vacuum elbow, instead it connects the smaller vacuum line from the decel valve directly to the plenum. QUOTE(bdstone914 @ May 18 2022, 07:55 AM)  I have found that there is are two different 2.0 plenums. One has a 13mm and 6mm (?) port and the other a 13mm 10 mm ports. I think the split is probably 73-74 and 75-76. But not sure which plenum fits which years. |
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| 914werke |
May 18 2022, 01:14 PM
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#4
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"I got blisters on me fingers" Group: Members Posts: 11,231 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest 
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QUOTE(emerygt350 @ May 18 2022, 09:37 AM) The two big ones are the 73 (& 74). (IMG:style_emoticons/default/agree.gif) Correct. Use of a stacked elbow for correct vac. lines is necessary. The 75 (76) plenum used the smaller ports & did away with that elbow. |
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