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Offenhauser Intake Manifold Holes
#1416570 07/10/2021 11:59 PM
Joined: Nov 2010
Posts: 56
Texas
T
TexApache
Offline
'Bolter
TexApache
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T Offline
Joined: Nov 2010
Posts: 56
Texas
Hello, I have a Chevy 250 motor with an Offenhauser intake on it set up for dual Carter Weber carbs. My question is about the 2 holes in the side of the intake nearest the firewall. What are they for? Are they both vacuum or something different? Appreciate any advice.
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Last edited by TexApache; 07/11/2021 12:32 AM. Reason: add picture
Re: Offenhauser Intake Manifold Holes
TexApache #1416586 07/11/2021 2:56 AM
Joined: Jun 2004
Posts: 8,597
Overland Park, Ks.
W
Wrenchbender Ret. Offline
Riding in the Passing Lane
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Joined: Jun 2004
Posts: 8,597
Overland Park, Ks.
If they go all the way through into the manifold they are vacuum outlets.

George

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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Re: Offenhauser Intake Manifold Holes
TexApache #1416640 07/11/2021 8:42 PM
Joined: Feb 2004
Posts: 29,804
Dellrose, TN
H
Hotrod Lincoln Offline
Kettle Custodian (pot stirrer)
Hotrod Lincoln
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Posts: 29,804
Dellrose, TN
Vacuum ports- - - -probably one for a PCV valve, and the other for a power brake booster and/or vacuum windshield wipers.
Jerry

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Re: Offenhauser Intake Manifold Holes
TexApache #1417466 07/20/2021 12:58 PM
Joined: Dec 2018
Posts: 2,450
Illinois
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fixite7 Offline
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fixite7
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Illinois
TexApache Some manifolds have a water jacket for heat .

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