Is the 55GPH worth the extra cost?

I can't answer that question directly, but I will give you my experience. I put a Meziere 35 GPH pump on a Roots blown 528" Hemi. I drove it on the street, in central Florida, and never had an issue with cooling. I don't know what you're combo is, but unless its something super exotic, I would bet you don't need 55 GPH.

Kinda what I figured but wanted to get some opinions...

No street, 540 Indy Maxx block 13-14 to 1 compression with B1 heads. Just don't want to buy the 35 and regret not getting the 55.

Well FWIW I run a 55GPM Reverse flow Meziere. I also have a very good radiator and Spal fan. The reasoning is for quick cooling down between rounds and someone is going to have a very difficult time burning me down

Thanks Al, there is no chance of moving too much water through a small radiator is there?

No reason in the world why a car that makes 6 passes in a 10hr day would need a 55 gal anything.I'll tell ya acura or honda radiators are being used more often for a big weight reduction and really to get enough water through the heads for the pass.If you do laps for competition then i see a 55 maybe being worth it.

Have you ever heard the phrase if you win come right back to the lanes? He is not asking about running a heads up car or nor is he a career test and tuner.

It is not unheard of for us to be hot lapped, especially in the super classes, which I beleive is where he is planning on running eventually. I have frequently run three rounds in less than 40 minutes. Heck we had one race that was rain delayed and ran the entire race in 4.5 hours, all 6 rounds. If you are racing in an environment when you have to be consistent to the .001 you need to keep things in the car at the same consistent level to be able to repeat those numbers. Whne trying to keep 1000+ hp engines cool enough to repeat to me there is no such thing as to much radiator or water pump in those situations.

FWIW my radiator is a double pass scirocco strly from BeCool. We can have my water temp completely cooled down to nothing in less than 10 minutes.

First off, the pumps are rated in Gallons per MINUTE, not hour.

I think 35 would be plenty, I run a moroso thats rated for 28GPM. Think about the smallest orfice in the cooling system, is it big enough to flow 55 Gallons Per Minute? Doubtful.

Is bigger always better, sure, we all tend to over build certain things.

Just run E85 and you wont need to worry about temperature.

Its all about the radiator to how fast the engine will
cool... if you have a 100 gpm pump with a postage stamp
radiator its gonna take time to cool it... if you have
a large radiator with 35gpm pump it will cool in minutes
but still needs a fan to help move air across the
radiator surface... temp differential between the
ambient and coolant temp on the radiator fins

The openings in the inlet and outlet are atleast 1-1/4" so you can pump a ton of water through there.A excellent fan is also crucial for an effective cooling system.
From my experience 35GPM will work ok but when I switched to a 55 GPM pump, My water temperature dropped much faster than with the 35 GPM Pump.
If your running a 16 volt system order a correct 16volt water pump from Meziere, you'll be surprised how fast your water temperature drops.

Thanks everyone for your input. Even you Dustin for busting my balls...lol. I do have a nice scirocco radiator and dual flex-a-lite fans with shrouds sealed to the radiator.

Hey at least we have a new topic to discuss on Moparts!

I run 55 for the same reason Al runs it. Do I need it, will put any size restrictor it over heats. The block is full filled it needs to move as much water as possible.

Do you need the 55 I wouldn't run anything less but that's just me

Running alcohol on my B1 it ran cool, I was uiung a 35 mez on mine. When I swapped to race fuel, it ran alot hotter and had me worrying about the next round and cool downs. I just bought a mez 55 the other day. 35's are for engines with hp less than 600 and street cars running on pump gas.

Forest, you won't look back if you just get the 55,