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Old 02-16-2020, 07:05 PM   #1
Join Date: Jul 2013
Location: Wasilla, Alaska
Posts: 35
Fuel Pump questions - Dodge big block

I have questions concerning fuel flow rate for a Dodge 413 big-block V8 in my '73 Winnebago Indian. This engine is part of the RB engine family which includes the 440 and the 400. It has an older 600 cfm 4bbl Holley Street Avenger carb installed by the previous owner.

Question #1: What was the flow rate for the factory mechanical fuel pump? It has a block-off plate where the pump was, and an electric pump installed by the previous owner. I THINK the electric pump is a 15-30 psi (not sure), and the PO did plumb a pressure regulator into the fuel system by the carb.

Question #2: I'm going to replace the old and cranky 600 cm with a larger carb for more hill climbing power. I live in Alaska, and 8%-10% (or steeper) highway grades are NORMAL here. Thinking about a 670 cfm Holly Truck Avenger carb since these units don't flood and stall at crazy angles. I'm open to looking at 650 cm units also, if someone has brand/model suggestions. Fuel injection is a future (3+ yrs) plan due to cost and complexity.

Question #3: My MH is set up for towing. Any idea what the factory hitch was rated for? 5,000 lbs? More? I have a '16 Kia Rio I am hoping to tow behind my Winnebago.

Question #4: The engine was rewired to a late-'70s electronic ignition by the PO as well. Can a 1-wire aftermarket HEI distributer work with this setup?

I am not a Dodge purist, just an owner who wants my classic MH to run better than it does. Any help is welcome.

And I do know about the various diesel engine conversions. I just don't have the available funds to pull it off.
1973 Winnebago Indian 27'
Dodge M375 chassis, 413 ci gas
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Old 02-17-2020, 06:51 AM   #2
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Join Date: May 2013
Location: Ontario, California
Posts: 2,429
Going to a larger CFM carb. won't necessarily give you better performance. Your engine probably will run better with the 600 CFM carb. I suspect that if you go to a larger carb, all you will be doing is adding fuel that the engine can't efficiently burn thus wasting fuel with no added gain.

Here's an article that will help you decide. Fuel pressure only needs to be 6 and 8 PSI
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Old 02-17-2020, 07:28 AM   #3
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Location: Vancouver Wash
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If you stick with a Holley, you want a center mounted float style.......not one that pivots off the end...and they make fuel pressure gauges.......MSD brand ign is what I'd be changing to....
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dodge, fuel, fuel pump

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