Proven dual carbs for a 263?

[Ton]

Hi all!

I have been searching this forum and others for a little while and haven't really found a straight answer yet. I have a 1941 46S with a rebuilt '50 263 bored 30 over. It was rebuilt in the 1970s and never started. The original owner bolted on a '41 dual intake and exhaust with a pair of 97 Strombergs. I was going to use the 97s till I discovered there is no port for the vac advance. I would swap over to my single carb setup off my parts car except that the PO hand built dual exhaust coming off the 41 manifolds that I'd like to keep. I assume that I will probably have to buy 3 to 4 bolt carb adapters.

My question is, has someone had a great experience with any particular pair of carbs on a non built 263 with the dual '41 intake? Did you run straight or progressive linkage? I am converting to 12 volts so electric chokes shouldn't be an issue. I want a reliable spring-fall daily driver for our unsalted seasons.

Thanks!

[Talpal]

I am running two Holley 94's with straight linkage on a 248 unmodified in 1941 Special Sedanette. I have very good luck with them and they provide a vacuum advance port.

[bruno]

Stromberg now offers a carb base with ported vac for the 97s for $150.

[Ton]

Thanks!
Do you happen to know which Venturi size you have on your 94s? That stromberg base looks like it would also work but I read somewhere that two 97s were too much carb for a non-built motor?

thanks!

[Jenz38]

I have in my '38 a overbored 263 with the same 41 manifold... i had less good experience with 32 ndix zeniths on it, (too less cfm),now i drive with 2 aav1 Strombergs in straight function, it goes like i want it, the stoich mix is in a good 13,5-14 mix , checked in front and rear flamehose .

[CNC-Dude]

I've made many billet Stromberg 94 and 97 carb spacers that were used on vintage engines that needed a vacuum source and were drilled just under the carb base to provide it. Most all early multi-carb intakes don't have a vacuum source in them and guys hated to drill and tap these old intake that they payed big bucks for. So the spacer provided a great alternative to do this.

[Ton]

Thanks CNC Dude! I will keep that in mind if I need a regular vacuum port added. I believe I need a port added to the carburetor rather than the manifold.

Thanks!

[bruno]

Correct me if I'm wrong, I believe the I-8 ran ported vac, if a spacer is under the base wouldn't it be manifold vac?

[firstofeight]

Correct me if I'm wrong, I believe the I-8 ran ported vac, if a spacer is under the base wouldn't it be manifold vac?

Right on both counts.

Ben

[Jenz38]

If i remember right,for 97 strombergs ,throttle bodys with a (ported ?) vaccum pin are available.
A frind of mine bought this for his Rocket engine with three 97's on it.