i have been told to use 2x 450 cfm on my supercharged 354 hemi motor is stock but with supercharger it is just for looks more than any thing would the holley ones new be good and do you need to buy them in a pair ?
They don't sell them in pairs. Just order 2 of them. Sent from my Moto G Play using The H.A.M.B. mobile app
You might consider a pair of AFB type carbs instead. I have two 750 CFM on my blown 427, it works well. https://www.summitracing.com/parts/edl-1404/overview/
You might check your intake to see what will fit. Holleys may have to sit sideways making the linkage tougher to do.
I have, and @ago has two Edelbrock 500's on our 6-71 supercharged 354 Hemi's. Both of us have them boost referenced, as per Ago's design. He has been driving his for a ton of miles, too. Nothing but success, so far.
Here is his thread. He set his adapter up with 4-holes per carb: https://www.jalopyjournal.com/forum/threads/boost-referance-edelbrock-afb-carbs.361134/ I ran mine open, so I can chose bigger carburetors, should I choose to make more power:
at lower boost levels, boost referencing doesn't seem to be necessary. I've never bothered, either with the Holleys I used to run, or the AFBs I have now. Lots and lots of miles, and lots of drag strip passes, no issues with burning pistons or anything that would indicate lean running. But if you like doing fancy stuff, you can go for it...
Yes, maybe true. But you can run leaner jets with boost reference. I tuned mine with LM1 meter. That way not guessing. Most of the time your out of boost. but the motor runs cleaner with boost Ref. !
I had a wideband on my AFBs when I first set them up. I ended up going with stock jets, but a thicker metering rod for the cruise part. It does dip lean under certain conditions, but it did not appear to me that boost reference would fix that. I had similar experience with the wideband on holleys on the blower. Most carbs are not precision devices. I don't pretend they are. And most engines will run pretty good with "close enough". for example, on my latest drag week adventure with my blown 427 with stock jetting on the AFBs, I drove over 4000 miles and made several low 10 second passes, but I never did take out a spark plug.
Yes blown motors can work without boost ref. What can happen without boost ref. The blower can be making low boost and pulling a vacuum at the carburetor, Then the metering rods or power valve will signal lean. With boost ref. the carb gets true vacuum signal from the blower manifold.
That can happen, but it's not a problem to run lean if the throttle is not open very far (which is the case when it's pulling a noticeable vacuum at the carb). WOT is what you have to worry about, and if the carbs are big enough, you won't be making enough vacuum under those conditions to pull the rods down. If you are afraid of the sky falling, go ahead and boost reference the carbs. otherwise, just drive the thing and don't worry about it.
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