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Old 07-02-2010, 05:17 PM
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badaboom badaboom is offline
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Join Date: Jun 05, 2001
Location: High Country Colorado, USA
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Question Emission tube bolts, Question

What is the reasoning behind the emisson tube mounting bolts.
The Hollow mounting bolts with the side hole.

Whats the deal?

What is the diff if you mount the emissions tube with a standard style bolt or the correct mounting bolts with the hollow shaft and side hole?
1981 Jeep J10 Laredo, 401-V8, 625 Carter Comp Series, Lunati Cam 262/268, Edelbrock Performer, MSD Ignition, Flow Cooler, Be Cool Aluminum Radiator, Doug Thorley, NV4500 5-Spd, NP-231D, 3.73 F/R Trac-Locs, Rustys 4" Lift, Vintage Red Metallic, Black Interior and 33X10.50X15 BFG, EXTREME MAKEOVER - IN PROCESS Bling Bling Cha-Ching
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Old 07-02-2010, 05:37 PM
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Thomas792 Thomas792 is offline
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Join Date: Sep 16, 2007
Location: Woodbridge, VA
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I believe that without the hollow bolt and the hole in the side of the bolt, the fresh air will never get through the tube. It is very much like the set up on your brake lines. I've heard it called a banjo bolt in the past on morotcycles.
1974 J10 (401, Th400, Q-Trac, D44s, 28" tires)
Mrs Tickity - 1988 GW (360, 727, 229, D44s, 32" tires)
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Old 07-02-2010, 11:33 PM
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Smiff Smiff is offline
Join Date: Apr 17, 2010
Location: Ohio
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Banjo bolt is the correct terminology for any fitting like that, and they are used in a lot of different pneumatic applications. In this case, it's a fastener that connects the air injection manifold to the exhaust manifold, and also provides access to the exhaust stream for the air injection system.

A standard bolt would actually close the air injection passageway, which could be advantageous if you want to delete your emissions equipment.... Hope this helps.
86 GW, stock 360/trans "Frank"
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Old 07-03-2010, 12:24 AM
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kennewick kennewick is offline
Join Date: May 19, 2010
Location: Kennewick WA: Columbia River
Posts: 116
Fine thread bolts and short. I think they were 9/16 but can't remember for sure. I couldn't find ones short enough so I had to skinny wheel the excess off each one and clean up the threads. Sure cleans up the engine bay. Toss the pump too as it will just freeze up from non use anyway. Of course all this only if you are dumping the air injection.
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76 Wag, Quad w/low, 401, TH400, Dana 44 3.54/1 non LS, stock manis w/short 2.5" duals glass packs w/H pipe. 2" lift. air shocks rear, gas front. Superwinch locking hubs. Shift kit.

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