74 Carby Flooding!

[Martin K.]

[Clem Z.]

Re: 74 Carby Flooding!

that carb should have a secondary power valve so make sure that it is not leaking. the PVs should be #85 pri and # 65 sec. and the jets should be #63 pri and #86 sec. does the fuel level in the sec say the same after setting or does it change?

[Martin K.]

Re: 74 Carby Flooding!

When I had the carby down I replaced both PV's with genuine items, the main jets were clear and correct. The secondary fuel level apears steady albeit a little higher than I would like. Looking at the secondary float through the inspection hole, it appears to be sitting lower than the primary float but I am not 100%. My inability to lower the secondary level any further still has me beat, but again, I am not sure if this the sole/part cause of my troubles or just a red herring. Thanks for the response.

[Clem Z.]

Re: 74 Carby Flooding!

if you are running out of threads on the needle/seat assy when trying to lower the float you need to bend up the little brass tab that make contact with the needle tip so the needle/seat assy will set higher in the float bowl theads but the float will be lower.

[Martin K.]

Re: 74 Carby Flooding!

I will do this so as to remove this problem from the equation. Thanks for the reply. Any other thoughts on how I could be getting excesive fuel to the back cylinders?

[Clem Z.]

Re: 74 Carby Flooding!

if the float level is too high fuel will come out the discharge nozzles all the time.

[Clem Z.]

PS

also check the secondary metering body for warpage and letting fuel past the gasket between it and the main body.

[Geno B.]

Re: 74 Carby Flooding!

on an unrelated subject martin. does your 74 have an original motor in it? i was doing some research on mine to determine if it as a restamped motor and needed a digital picture of an original engine pad to compare it to.

[Martin K.]

Re: 74 Carby Flooding!

I do not have a photo of my pad but I have found one that should suit.

1974 Corvette Matching #'s 454 engine. VIN 1Z37Z4S412624. Casting # 3999289, Pad # T12 11 CWR 14S412624. Turbo 400 automatic transmission.
From: http://www.gmdownunder.com/9240-74vet.html

If you go to the above web site there is a good digital photo of the engine pad.

[Geno B.]

Re: 74 Carby Flooding!

thanks martin. that is a really good engine pad picture. i just looked at it. mine is a small block so my pad is a little different but everything helps.

geno