Anybody running a Edelbrock carb on their six? I am looking at buying the 1404 500 cfm model. Engine is stock with a Clifford intake and EFI dual exhaust manifolds.
Looking for actual user feedback of this carb on a 300 six.
Thanks!

 

I ran one for about a year. It was great performance, dependable, and easy to tune. Out of the box it took 10 minutes to tune.

Negative: I've never heard anyone brag about mpg with one.

 

Running a 600 cfm Edelbrock on mine with a Clifford water heated intake and EFI exhaust. Runs a bit rich right now (too lazy to tune it) but does not bog off idle like the Holley's I have tried.

 

Thanks for the input.

How do you guys orient your carb on the intake? Primaries toward the engine or away?
Or does it matter?

 

On a DP manifold the primaries are closest to the engine. You need to have coolant heated plate below unless you're using oe exhaust.

 

Looks like he has efi manifolds, so heat is needed.
tinman, if it's a newer clifford manifold, it should have 2 barbs you plumb inline with your heater hose. The older manifolds require making a plate on the bottom of the manifold and plumbing heat into the plate. The newer manifolds with the coolant passage built in are inferior castings with porosity between the passage and plenum, so check for coolant leaks into the manifold. Been there, done that, cut the coolant passage off and welded on a chunk of 1x1 aluminum tube.

 

Primaries orientated away from the engine. Mainly for ease of routing the throttle linkage. Along with the water leakage be careful not to over tighten the carb studs/bolts with this manifold or you will strip them.

 

Thanks, it seems like having the primaries outboard would make for more equal flow to all ports. This is an older open plenum intake without the water passages.

 

You can turn the primaries however you like. I have tried both ways. However, if you read the Offenhauser speil about the DP, it is clear that their intention, how it was designed and engineered, was to have the primaries closest to the engine.

My thoughts on the matter: Look at the oem intake runners. They are as large as the head passages. It is the carb opening that is the cork, the bottleneck. When a person intalls a DP they are changing the bottleneck from the carb opening to the runners. You get a large carb opening, but runners less than 50% (primary side) of the oem runners. That is idiotic. A person spends $ making the head flow, making the exhaust breathe, and then puts on an intake that restricts flow by 50%. Had I known better when I built my engine I would have gone with the C.

I will say, however, that I believe the DP will work better if you're running a large carb. Smaller runners mean increasing the velocity of the mix, thereby making the carb more responsive. It gets a stronger signal.

 

I've had mine for about 5 years. Had one minor issue, the screws in throttle plates came loose. Just a month ago got the calibration kit, and it's up to 14.5 mpg on the hiway, and that's at 70-75 mph.

 

I wouldn't go out of my way to get a 500 vs 600 cfm. I've run both and didn't notice any difference. The 600s are easy to find on craigslist or swap meets for cheap. Just throw a kit in it and drive.