Holley 3367 secondary metering plate ID

[Ron S.]

Anyone know the Holley part number for the secondary metering plate for a List 3367 carb? I have 2 of them and am trying to determine which is correct. One is #34R-2007B with a 2 stamped above the 34R and the #22 stamped in middle of plate; the other is 34R-9716B with UDC 7 stamped above part number and #22 stamped in middle of plate (I think this may be the original based on it's appearance). I have been searching all over the internet for a listing of Holley parts and part numbers to no avail. Anybody know where or if this information is available?

Thanks!

[Joe L.]

Re: Holley 3367 secondary metering plate ID

Anyone know the Holley part number for the secondary metering plate for a List 3367 carb? I have 2 of them and am trying to determine which is correct. One is #34R-2007B with a 2 stamped above the 34R and the #22 stamped in middle of plate; the other is 34R-9716B with UDC 7 stamped above part number and #22 stamped in middle of plate (I think this may be the original based on it's appearance). I have been searching all over the internet for a listing of Holley parts and part numbers to no avail. Anybody know where or if this information is available?

Thanks!

Ron------


The correct one is the one stamped 34R-9716B.

[William F.]

Re: Holley 3367 secondary metering plate ID

Call Holley tech line and get a Holley catalog. Local speed shop could probably help.
By the way is this the correct plate for the 3811 carb also?

[Timothy B.]

Re: Holley 3367 secondary metering plate ID

It's probably the correct production metering plate for all those production 585 CFM Holley's. If they are both stamped 22 my GUESS is that they are the same. The main jet is .076 and the idle jet is .028, be careful as these cheap metering blocks warp easily from tightening the screws.

[William F.]

Re: Holley 3367 secondary metering plate ID

Timothy,
Thanks for reply. Also, what would be symptoms if the metering plate was warped? I've mentioned in a previous post that I have an unusual problem that my 3811 on my '67 L36 floods from the secondary boosters, not the primaries and only after starting the car after it has been parked in a nose up position or when front has been elevated by front wheels being on a ramp. After flooding stops and car is in level position, no more flooding. I'm in process of replacing float and needle/seat just in case. Could a warped plate cause this? Wouldn't think so since problem only occurs with front end elevated, but asking.

[Timothy B.]

Re: Holley 3367 secondary metering plate ID

Bill,

I remember you post concerning this issue. IMO, keep the float to the low side of the adjustment, I think raising the car front is changing the angle of the fuel in the bowl and maybe the float allows more fuel pumped into the bowl because of this. The result is the spill distance from the fuel level and booster nozzle is reduced to where the fuel drips. Don't be afraid to lower it a good 1/16", I don't think it will hurt anything.

My experience with the metering plate leaking from warp or gasket seal is a internal fuel leak and fuel leaking from the transfer slots and any other place it can find above the throttle blades but I don't think from the booster nozzles. The result is the engine will run rich and fuel will always be present on the throttle blades and intake manifold where it runs out of the carburetor side. Picture it like a glass of water with a crack in the glass where atmospheric pressure is above and it seeps until the water is below the crack. Fuel entering the main and idle wells is supposed to travel up above float level then back down while it's mixed with air from the bleed. With a internal leak the fuel just finds it's way around this into the carburetor.

Get a piece or 220 wet sandpaper and broach the plate and also that flat metal backing plate. If it's warped, lay it flat and tap it flat first but be careful not to close the main jet holes located on the bottom. If you do just open them again with .076 drill bit carefully. IMO, the thinner gaskets are better because it makes for a tight sandwich where thick gaskets may shrink if they dry out but I usually use what I have on hand. Don't get crazy with the screws, check the torque specs because I believe it's inlbs. I usually make them hand snug then just a little more trying to keep them all about the same.

[William F.]

Re: Holley 3367 secondary metering plate ID

Thanks for additional info..

[William F.]

Re: Holley 3367 secondary metering plate ID

Problem with my secondary only flooding and only when nose of L36 pointed up solved. Took rear bowl off, removed needle/seat and float. Guess what, float had gas in it-pinhole, I suppose. Thought I had checked this previously, but maybe not. Interestingly, this was the second bad float in 2 correct Holleys I had bought new from Holley. Other was on my L79. Guess poor quality of soldering together of the 2 halves of the brass floats.