Technical How to build a engine to run 6 Holley 94’s

Hello I need some help on how should I build my engine to run good with 6 Holley 94’s, I have a sbc 350 and a manifold to run the 94’s on them. The engine is all disassembled and I’m trying to figure how to how to build it so that everything works good. I have a tr6060 as a trans and an 8.8 ford with 3:50 gears LSD tires will be 28in in diameter. what combination did you guys run and got good response and power

 

Those manifolds were never really intended for street use. When they were originally designed in the mid-'50s, 4V carbs were still OEM only, relatively rare and expensive, and there were no 'performance' versions. The 'modern' Holley carb didn't appear until 1957, and aftermarket performance versions of it didn't start showing up until the early '60s. Those 6 or 8 carb intakes were designed to dump a lot of fuel into the motor at high RPM, with low/mid range performance as secondary. Popular on race motors running gas or especially alcohol, as sort of a 'poor man's fuel injection'. A modern 4V carb/intake will out-perform them at every point.

With that said, if you're determined to run it on the street, your best bet will be to block off the outer 4 carbs and just run on the inner 2. That's the most common solution. Save you some $$ too; those outer carbs can be just 'shells'. Talk to your cam supplier for the best grind.

 

Thanks for your feedback, yea I was thinking of running only 2 and have the others as dummies just for looks

 

A lot depends on manifold design. If just running the 2 center carbs it may starve the end cylinders.

 

The manifolds vary as to what, if any, as to the size of the balance tubes. I am not a fan of just running two carbs. If you have six, use them. And if you do the math to convert two barrel CFM to four barrel CFM it's not over carbed. The biggest thing to focus on is how to get adequate air flow through the carbs so they meter correctly. Know going in that you'll probably make more power with a four barrel. But that's not what we go down this road. When building the engine for a multi carb setup:

1. Select a cam that has decent idle vacuum.
2. Use heads with moderate intake ports. Something in the 165-170 CFM is big enough.
3. A spacer under the carbs of 1.5" to 2" helps.
4. Even if you use progressing linkage keep the idle circuits in the 4 end carbs.
5. Running straight linkage is my preference.
6. Make sure all of the carbs match in all details.
7. I run power valves in the two center carbs.
8. Buy a Uni-sync.
9. An AFR gauge helps.
10. If you don't like working on carbs, changing jets, etc., don't bother trying. There is no such thing as a "set it and forget it" 6X2 setup.

 

If you had asked about Stromberg or Carter carbs, Jim's list of 10 items (above) is really hard to beat.

Since you have Holleys, I will be still, other than the comment above.

Jon.