Thread: MSD Ready to Run

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I was reading a forum and it was mentioned that a stock chevy distributor with points needs a timed vacum port and a HEI should have its vacuum hooked to a ported source. My question is, Is a MSD ready to run distributor considered HEI and should the vacuum advance be connected to a ported vacuum or constant vacuum ? I have a MSD ready to run distributor that has the vacuum advance hooked to the timed vacuum port of a Edelbrock 1405 carb. I do have a flat spot on accelaration after comming out of a turn at an intersection, now I'm not sure if I have the Vacuum in the right port ? Any and all help would be appreciated.

Try it from both sources and choose the one that works best.

Denny, thanks for the reply. The motor is a sbc 350 30 over 4 bolt main with a Crane came 218 dur .450 lift, not sure what year, purchased from The Engine Store in Minnisota. 700 r4 trans. It does not matter which way I turn, it will heisatate when I'm coasting and then accelarate again. Not sure of the rpm.
The timing is 15 base and 35 advance at 3000 rpm. Her's the rest of the set up.
msd ready to run Dist
Edelbrock RPM intake
Edelbrock 1405 carb manual chock
cc head chevy cast
Headers
I hope this helps. If not let me know and I will post
Thanks again Denny

Thanks Denney I will give it a try and let you know.

I retimed, 8 BTC hooked the vacum up to full. The motor performs much better. I checked to see if the carb pump shoots when the pump is moved and it does, Still has the flat spot, the only thing I have not checked is the fuel pressure, I will get a gauge and fittings and reply back with results.

I just got a fuel pressure guage and checked the pressure. It shows 9 psi, the Edelbrock manual states that this carb (1405) requires 6.0 psi. Would the 3 psi make that big of a difference in the performance of the carb ?, causing the flat spot that I am experiencing ? The carb is only 6 mos old with 325 miles. If I need to purchase a pressure regulator, do you have any suggestions.

I for got to mention that the flat spot is at 1000 to 1200 rpms.

Yes, the 3 extra lbs is not good on the needle and seat. your flat spot could be caused by float setting and/or metering rods.

That being the case, which would be a better choice a regulator or a 6 psi fuel pump ? or is it all preference ?

If it were me,I'd put a regulator on it.

Thanks for the information, Is any one better than the other, Holly, Ededlbrock, etc ?

Defiantly put a regulator in there. Holley or Edelbrock.....either one will work just fine. Another thing to look at is the timing curve, play around with the different spring combinations. I ended up with one heavy silver spring and one light silver spring. Slowing the advance curve down a little took my stumble completely away......Just a thought.....

Thanks Chuck I will try different combinations with the springs.

Here's an update , I installed a fuel pressure regulator and readjusted the Carb and now my hesitation has gone away. Thanks for the help on that problem.
Chuck I started playing wit the timing curve with the different springs now it pings, I guess I will play around some more. Thanks again.

Thanks Denny I will change to heavier springs and give you an update.