4gc carb
 

Anyone care to share the trick to make this carb work in a wheel stand.? I have tryed most every thing more fuel pressure 13# and down to 9# 5 degrees to 10. open spacers 4 hole 1 inch to 13/4 all i can get under the hood .If I tie the car down then it spins. Will do it off the ft brake or trans brake, SMALL BLK 327 250HP. 3200lbs 5.38 2.52 92 inch 10.5 raidail tHE ENGINE JUST QUITS IN THE MIDDLE OF THE Wheel stand drops like a ton bricks . So far 1 broken trans case 1 broken oil pan. 1 bent set of headers. I have limters on the ft and wheelie bars. Its not the wheel stand just that the motor quits. A small holley it goes right down the track. I have 2 carbs 1 Deno 1 Prc they both do it. Help.

Re: 4gc carb
 

Retard the timing on launch. Doing so, you might run faster with just the timing retarded and / or the front tied down. The cheapest / easiest solution that pops up in my pea brain.

Re: 4gc carb
 

Wedge Spacer?

Re: 4gc carb
 

You have PM

Re: 4gc carb
 

I run a Deano 4gc with a heads up spacer. 7 psi leaving at 9000 in the air never a problem. This is the angle spacer. I was told you cant run a flat spacer with a 4gc.

Re: 4gc carb
 

As I said have wedge spacer ran fuel psi where Deno told to start.I dont have hood cl for more than 13/4 inchs

Re: 4gc carb
 

You can angle mill the carb flange as well as running a wedge spacer.

Re: 4gc carb
 

Maybe try lowering the float a bit. I tend to run the float in the 4gcsin my sticker just a bit lower than Deano has them set.

One thing that the guy from Product Engineering mentioned to me once had to do with fuel regulator mounting position. At the time, he was talking Q Jets, but his concern was a fuel regulator being mounted ahead of the carb. He said the g force of the launch could hit the needle on the launch and blow it off of the seat.

Our stocker would leave pretty high in J Stick at 7200 with no issues. Stock manifold with no wedge, just felpro base gaskets.

Re: 4gc carb
 

Try lowering the fuel pressure even more, as low as 4 or 5 lbs. It works for Q-Jets.

I know it sounds backward, but what have you got to lose?

Re: 4gc carb
 

typically high float(s)

Re: 4gc carb
 

Really, I did not think you could modify the carb?

Re: 4gc carb
 

Angle mill the flange on the intake manifold

Re: 4gc carb
 

If you knew anything about the 4gc wouldnt make that remark.

Re: 4gc carb
 

Jim are you back in Puk?

Re: 4gc carb
 

Yes sir been back for a couple of months,This carb thing ,if it is the carb,has me baffled.

Re: 4gc carb
 

Try that on a victor e. Let me know how it works out.not much pad their.

Re: 4gc carb
 

How much I have tried A 5 7AND 10 Degrees.

Re: 4gc carb
 

If you are going to thunder valley I mite be able to come up with a couple of things for you to try. Tom

Re: 4gc carb
 

Jim,

Call me if you want to talk about this again. Have you tried everything we discussed previously? If this is a carb problem, we can solve it.

Dean

Re: 4gc carb
 

Yes plan to be their the first day at least.

Re: 4gc carb
 

Dean what is a good time, the carb you did for me has weight on it, yes I tried the fuel pressure 10 10.5 11. 13. No help I have a 10 degree that is about 9 on the car this is a open spacer. Also a 7 tapered 1.75 , and have tryd 9 degree1inch open with the tapered 1.5 on top.None of these seam to make any change.? I have found a wedge float i will try next wk .

Re: 4gc carb
 

It was a gasket.Thanks to Gene B Who took the time to look it for me and came up with a fix. not the floats, not the fuel pressure, not a wedgespacer.

Re: 4gc carb
 

Thanks for the update. Not very often do we get a cure posted. Was it a torn top gasket or?

Re: 4gc carb
 

There are 2 types of upper gaskets and for some reason this carb wants the closed one. Again thanks to Gene for his help.