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The Offenhauser 3661 Breather: Â Is designed to relieve pressure in valve covers Gives your engine that professional appearance Very popular – Attractive Mounts on most stock covers. Small – easy to install If breathers are to be installed on custom style valve covers, it will be necessary to remove a fin.
Not a falsie! Polished aluminum “Gets the Job Done.”
Approximately 2″ wide at top and 1 1/4 ” high. Complete with gaskets.
The Offenhauser 3858 accepts 3 bolt carbs on a 2 bolt adaption A base. The stud to stud spacing on our adapters are as follows: Offenhauser 3859 – 2 15/16″ Offenhauser 3858 – 2 5/8″
The Offenhauser 3859 accepts 3 bolt carb on 2 bolt adaption B base The stud to stud spacing on our adapters are as follows: Offenhauser 3859 – 2 15/16″ Offenhauser 3858 – 2 5/8″
The Offenhauser 3860 accepts 3 bolt carb on 4 bolt adaption A base
Offenhauser 3920 Oldsmobile Water Crossover This water crossover is adaptable to fit Oldsmobile engines from 1949-’66 3920 fits Oldsmobile 303 & 324 CID engines 1949-’56 3921 fits Oldsmobile engines 371 CID 1957-’58 5197 fits Oldsmobile engines 394 CID 1959-’66
Offenhauser 3921S Oldsmobile Water Crossover SPACER ONLY 1957-’58. Sold in a pair. For use with Offenhauser part #3920. Allows 3920 to fit with Oldsmobile 371 CID engines. 1/4″ spacers should be installed between the crossover and the manifold. Gasket not provided.
Intake Manifold, Pacesetter, Log, Aluminum, Natural, Six 2-Barrel, Chevy, Small Block
Offenhauser 6-Carburetor Log intake manifolds can be used with just two or up to six 2-barrel carburetors, depending on the application. They have a balanced “Jet Air Flo” design, with rectangular “Ventura” intake passages. Designed for 3-bolt carbs only.
“Chev”- With Heat 6 Carburetor Pacesetter Manifold for 348 ONLY, NOT 409.
This Offenhauser carb adapter will work on their flathead 4 brl intake manifold (also Y-block Ford and other apps) to put on either a Carter AFB, Edelbrock Performer or Holley std bore 4 brl. ( AFB or Edelbrock won’t work on 48 and earlier engines because of the water outlets).  The manifold base measurement is 3 & 7/8″ X 3 & 3/4″.  It is prox 1/2″ thick.
Holley 4 bl Carb to Carter AFB & Small Rochester 4 bl manifold
This Offenhauser carb adapter will work on their flathead 4 brl intake manifold (also Y-block Ford and other apps) to put on either a Carter AFB, Edelbrock Performer or Holley std bore 4 brl. ( AFB or Edelbrock won’t work on 48 and earlier engines because of the water outlets).  The manifold base measurement is 3 & 7/8″ X 3 & 3/4″.  It is prox 1/2″ thick.
Quad Adapter C Carb. On either Quad Adaptation A or B Base
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