Hi! I'm installing an Offenhauser 1075 dual intake manifold. Now I'm stuck at the threaded hole under the rear carburetor. I have left over an air vent line from the gas tank, as I think it is. What size does the thread have? Is it unf or unc? Thanks for help!
Vacuum fitting goes there, for the wipers. Probably is 3/8"- 24 thread (fine) or 1/8" pipe thread. Just use a short bolt to plug it if not needed.
Would be nice if somebody knew exactly as inch threads are not common in Germany and I have to order all online. I hate it to wait just for a fucking screw Thank you guys! In that short time I‘m in this forum I got good help! Would have saved me lots of Dollares if I would have joined earlier. Seems like Flatheads are eating $$$
Jonesi - I went to the garage & checked an Edelbrock & Weiand intake, don't have an Offy. 3/8"- 24 thread works. A short (1/2") long bolt with a thread sealer would work . Flatheads eat a lot of money, but older Cadillac's are not far behind in cost.