No, the carburetor just needs to be tuned. The edelbrock carb. will not handle more than about 5 PSI of fuel pressure. Start there. Also, make sure your float level is set properly. Edelbrock has some great tuning video's on their website - check them out.

 

If you pull the plugs and they are a nice dry tan color, mixture is fine, no trash in the needle and seat (engine would be flooding in that case) I would then look at the accelerator pump shot. This is assuming the idle mixture is setup properly. As mentioned above, carb tuning. Also, check your spark timing. The engine comes with a recommended engine timing but when you start switching out stuff like carbs and manifolds, varibles change. Timing, mixture, pump shot, it's all inter-related. You just have to find the sweet spot.

alan

 

I have 2 1405's on my setup. 99% of all hesitation/surge problems with these carbs can be resolved by checking float levels, and then changing step-up springs to better match your car's engine conditions (mainly vacuum measurements). I've had these on my blown sbc for 7 years now, and the step-up springs are the definite key to having these run right with no off-idle hesistations. Edelbrock has some good info on their site and manuals, but leave a little to be desired on the adjustments for off-idle. If you read the theory of operation part of the manual, it helps out quite a bit. Just my $.02.

 

Thank you. We've tuned and returned the timing. I'll recheck the sparkplugs and I'm going to take a look in the carb for trash. If nothing there, then I'm off to find an inline fuel presure guage and see what that tells me. I'll post my findings.

Current Timing Setup:
Intial Timing 14 Degress
36 Degress Total Time without Vac Advance @ 3000 rpm, 52 Degress with Vac Advance @ 3000 rpm
MSD distributor (using a blue and silver spring)
MSD Street Fighter Wires
Accel Header Spark Plugs - Gap .45
Vacuum 15Hg (+/- 1 @ ideal because of cam)
Preimum Gas Only

 

Just to continue along with this thread, I too have recently (last Fall) put a 1406 Edelbrock on my 327. (I had been using a 457S Holley that I finaly got running right in October)...but wanted to comare it to an Edelbrock. (So far, I have no preference).

Anway...I too get a very minor hesitation (just off idle) from teh stock set-up of the 1406...I just swithed over from the stock "yellow" springs to the slightly stiffer "orange" springs. Unfortunately the weather turned foul and the Camaro will stay indoors for a while so I can't verify if it has made any difference.

But I have a related question....

The 1406 manual suggests that you may be able to get a little more aggressive "squirt" from the accel. plunger by reloacting the arm linkage "closer" to the body of the carb. So the factory default is the center hole. Which one is closer to the body, the one above or the one below the center hole??

Vic

 

Read the latest issue of Hot Rod, April?, has an article on tuning out a hesitation on Eddy carbs.

 

throw it in the scrap heap and buy a holley. I have heard nothing but bad about these things.

 

throw it in the scrap heap and buy a holley. I have heard nothing but bad about these things.

So let me be the 1st to tell you then, I've ran 2 of them on a street driven blown SBC for over 22,000 miles...... if they're tuned right, they're absolutely reliable and foolproof. No power valves and plastic parts to deal with either. I'll keep my Eddys over the Holley.

 

no power valves in holleys either

 

What? haha

I had a 850 holley that gave me nothing but problems, however I bought it used so it might have other problems. I ended up putting it on the shelf and buying a 750 eddy that I love, but I do get a hesitation when the car is not completely warmed up just taking off.

 

what i meant is the new power valves do not blow out like the old ones

 

After looking around a bit, for my benefit also...try changing the hole on the accelerator pump first, its pretty simple and might work. Do you have a regulator or gauge for that fuel pump? You might have too much, my Holley pump had like 9-10psi so I took it down to about 6 I believe.

 

Adjusting the pump shot is a very easy change to make and just as easy to reverse if it does not help. Takes just a minute. Try that first.

Sent from my PC36100 using AutoGuide.com App

 

Thanks for all the suggestions and I'll look for that Hot Rod mag article, but here's where I'm at today. The fuel pressure is good, idle mixture seems good and giving me a little better than 15hg at 750rpms, changed the fuel filter, moved the acceleration pump from the top, back to the middle hole, changed the stage springs to the silver 8hg set and then the meter rods one size with test drives between the springs and rods and it seems a little better, but it started drizzle and we had to retreat to the garage.