Vacuum hard line mounting? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**leddzepp** · 03-20-2024, 03:32 PM

Finishing up the install of a th350 in my truck, wondering where the tab goes on the bell housing on the hard line leading to the vacuum modulator? Does it mount on the outside of the bell housing, or between the bell housing and the engine block? I think the dipstick tube mounting tab goes on the outside if I remember correctly…

**Steeveedee** · 03-20-2024, 06:53 PM

Does not go between the block and the trans.

**HO455** · 03-20-2024, 07:19 PM

X2!
I usually try to put a flat washer on each side of the tab. I.E. one under the head of the bolt and one between the tab and the bellhousing. It helps to keep the tab from distorting when the bolt is tightened down.

**leddzepp** · 03-20-2024, 09:09 PM

Thanks y’all! I didn’t think it did go between, BUT if it did, the hard line would be directly above the vacuum modulator and the rubber line connecting them together would be perfectly straight. When the tab is on the outside of the bell housing, the rubber line becomes an “s” shape to make the connection. I know the dipstick tube mounting tab goes on the outside, as that is the only way it fits, and it lines up perfectly. The dipstick tube mounting tab and the vacuum hard line both use the same bell housing hole, correct? Thanks again

03-20-2024, 03:32 PM	#1
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,981	Vacuum hard line mounting? Finishing up the install of a th350 in my truck, wondering where the tab goes on the bell housing on the hard line leading to the vacuum modulator? Does it mount on the outside of the bell housing, or between the bell housing and the engine block? I think the dipstick tube mounting tab goes on the outside if I remember correctly… __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man

03-20-2024, 06:53 PM	#2
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,093	Re: Vacuum hard line mounting? Does not go between the block and the trans. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA

03-20-2024, 07:19 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,808	Re: Vacuum hard line mounting? X2! I usually try to put a flat washer on each side of the tab. I.E. one under the head of the bolt and one between the tab and the bellhousing. It helps to keep the tab from distorting when the bolt is tightened down. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

03-20-2024, 09:09 PM	#4
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 19,981	Re: Vacuum hard line mounting? Thanks y’all! I didn’t think it did go between, BUT if it did, the hard line would be directly above the vacuum modulator and the rubber line connecting them together would be perfectly straight. When the tab is on the outside of the bell housing, the rubber line becomes an “s” shape to make the connection. I know the dipstick tube mounting tab goes on the outside, as that is the only way it fits, and it lines up perfectly. The dipstick tube mounting tab and the vacuum hard line both use the same bell housing hole, correct? Thanks again __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man



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