LS truck intake connection question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hubdawg · 06-09-2021, 07:53 PM

What is supposed to be where the big open hole on top of the front of the intake manifold is. Can’t find any diagrams or pictures. I’m sure that has to be closed for vacuum.

hubdawg · 06-09-2021, 08:27 PM

looks like it should have been some type of mount that has finally broken off and has been causing my vacuum leak. Is the intake something I should buy from a wrecking yard or should I upgrade to something better at the time. I have a feeling this must of had a small crack and finnally came off

ls1nova71 · 06-10-2021, 02:35 AM

Yes, thats the part the Vortec cover bolts to, and its clearly broken off. Never seen one break other than when the truck was in a wreck or the lift chain caught it while pulling or installing the engine. Could have been cracked during a wreck if the truck the engine came out of was wrecked though. I would just get a used GM intake, people practically give them away because they're so plentiful.

hubdawg · 06-11-2021, 08:28 PM

Have a feeling that has been the problem the whole time. Must have cracked the support mount a little when I was removing and transferring the engine/tranny and it finally broke off completely. Small vacuum leak to huge one in one snap. I looked at previous pictures and it looked fine. Got one coming today from a parts yard for $80 and hopefully get it in tomorrow.

hubdawg · 06-11-2021, 08:29 PM

Anything to be careful of when swapping out the intake or proper steps?

06-09-2021, 07:53 PM	#1
hubdawg Registered User Join Date: Aug 2017 Location: Colville Posts: 65	LS truck intake connection question What is supposed to be where the big open hole on top of the front of the intake manifold is. Can’t find any diagrams or pictures. I’m sure that has to be closed for vacuum. Attached Images

06-09-2021, 08:27 PM	#2
hubdawg Registered User Join Date: Aug 2017 Location: Colville Posts: 65	Re: LS truck intake connection question looks like it should have been some type of mount that has finally broken off and has been causing my vacuum leak. Is the intake something I should buy from a wrecking yard or should I upgrade to something better at the time. I have a feeling this must of had a small crack and finnally came off

06-10-2021, 02:35 AM	#3
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: LS truck intake connection question Yes, thats the part the Vortec cover bolts to, and its clearly broken off. Never seen one break other than when the truck was in a wreck or the lift chain caught it while pulling or installing the engine. Could have been cracked during a wreck if the truck the engine came out of was wrecked though. I would just get a used GM intake, people practically give them away because they're so plentiful. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

06-11-2021, 08:28 PM	#4
hubdawg Registered User Join Date: Aug 2017 Location: Colville Posts: 65	Re: LS truck intake connection question Have a feeling that has been the problem the whole time. Must have cracked the support mount a little when I was removing and transferring the engine/tranny and it finally broke off completely. Small vacuum leak to huge one in one snap. I looked at previous pictures and it looked fine. Got one coming today from a parts yard for $80 and hopefully get it in tomorrow.

06-11-2021, 08:29 PM	#5
hubdawg Registered User Join Date: Aug 2017 Location: Colville Posts: 65	Re: LS truck intake connection question Anything to be careful of when swapping out the intake or proper steps?



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