I've got a 440 in the works. 9:1 compression, 500 lift cam, .254 duration at .050 solid cam, home ported 906 heads. I plan on running a tunnel ram, and already have a pair of 1850-3 carbs. I think 450 cfm holleys would be a better choice, but has anyone run a pair of 1850s?

Or, what carter carbs would be a good choice?

I need to find an original dual TQ top intake.

I have several matching sets.

NTOLERANCE


I think you will be fine, I use a pair, straight OTB Holley 1850's on my 509 cam 10:8 comp 440 with home ported 346 iron heads. It runs sweet on the street and has only opened up the secondaries a couple of times. It really depends on how you drive.

I put 1 step lighter secondary springs and I could go more. I am going to put on a balance tube to the vacuume so they get a balanced draw.

here is a pic of the set up. Also it is important to use four hole spacers under the carbs to give the carbs a stronger signal

I like the 1850's over the 450's on a street tunnel ram since they are vac sec. The 450's are mech sec but don't have pumps on the sec's so you end up with a lean bog when you jump on it, you just can't get enough fuel thru them even with 50cc pumps.

On the 1850's switch them to 50cc pumps, change the metering plates to metering blocks and get the kit that ties the sec diaphrams together.

Another setup I like but looks strange is 2-500 holley 2 barrels mounted sideways, I ran that setup on a 360 and had great throttle response and midrange torque.