402 intake manifold Vacuum fitting? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Daves72'GMC · 01-21-2004, 10:04 PM

On my 402BB there's a fitting which is a vacuum fitting on the intake manifold next to the distributor that has 2 ends coming out of it one goes to the trans modulator and I don't know what the other goes to. Can someone please check theirs and let me know where it goes? Thank you. Dave

gregsplace · 01-21-2004, 10:19 PM

The other "end" is usually for the a/c vacuum. I f you dont have ac, plug it.

Daves72'GMC · 01-21-2004, 10:31 PM

I do have A/C. Where on the A/C does it go on? The gentleman thats restoring my truck forgot where it went. Thank you very much. Dave

gregsplace · 01-21-2004, 10:39 PM

It goes over to the vacuum canister on the side of your evap. box, from there a smaller vacuum line goes into your cab to your ac controls

Daves72'GMC · 01-21-2004, 11:22 PM

Thank you very much. Dave

jhow66 · 01-22-2004, 02:25 AM

here

01-21-2004, 10:04 PM	#1
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	402 intake manifold Vacuum fitting? On my 402BB there's a fitting which is a vacuum fitting on the intake manifold next to the distributor that has 2 ends coming out of it one goes to the trans modulator and I don't know what the other goes to. Can someone please check theirs and let me know where it goes? Thank you. Dave

01-21-2004, 10:19 PM	#2
gregsplace Senior Member Join Date: Dec 2000 Location: Colwich,Kansas Posts: 713	The other "end" is usually for the a/c vacuum. I f you dont have ac, plug it. __________________ 67 3/4 4x4 402,a/t,flat bed 98 GMC Sierra swb daily driver 87 burb parting out. 68 1/2 chevy, 350/350, 71 gmc frame, kid's beater 69 1ton 396-4sp, dump 69 swb stepside 396/400th current frameup 67 swb 454/400th rebuilding now, oldest boy just rolled it 99,HD, Road King Classic Colwich Ks

01-21-2004, 10:39 PM	#4
gregsplace Senior Member Join Date: Dec 2000 Location: Colwich,Kansas Posts: 713	It goes over to the vacuum canister on the side of your evap. box, from there a smaller vacuum line goes into your cab to your ac controls __________________ 67 3/4 4x4 402,a/t,flat bed 98 GMC Sierra swb daily driver 87 burb parting out. 68 1/2 chevy, 350/350, 71 gmc frame, kid's beater 69 1ton 396-4sp, dump 69 swb stepside 396/400th current frameup 67 swb 454/400th rebuilding now, oldest boy just rolled it 99,HD, Road King Classic Colwich Ks

01-22-2004, 02:25 AM	#6
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	vac line here Attached Images __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

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01-21-2004, 10:31 PM	#3
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	I do have A/C. Where on the A/C does it go on? The gentleman thats restoring my truck forgot where it went. Thank you very much. Dave

01-21-2004, 11:22 PM	#5
Daves72'GMC Registered User Join Date: Mar 2003 Location: Asheville, N.C Posts: 952	Thank you very much. Dave



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