Earl,

       Pull the carb, and fill it with fuel. In a vented area (you knew that). Watch to see where the fuel is coming from. Could be a Metering plate gasket, or most likely, it'd be a ruptured power valve as Ted said. That's pretty common on holleys and those are the symptoms.

   Holley has had a number of QC issues lately, including warped metering blocks. The die caster was not checking the parts and pulling them from the die while they were too hot. They can warp or bend in that condition.  

Frank/Rebop

Bristol, In ( by Elkhart) 

another fun filled Saturday on the horizon. Thanks for the help. will advise. That list number I found translates to a model 4150 Holley. 600 CFM .Is that right? The rebuilder said it was a 415 CFM. ????

55Birdman  Hickory NC

 

 

thought pictures may help. 2nd one shows gas leak at back bowl. Most likely from sight hole. 

55Birdman  Hickory NC

Earl -

Aside from the other good suggestions I read above - put steel needle and seat assemblies in there. Hoosier convinced me after I found the sticking needle seat problem more than once. 

Get a thermal isolator spacer - it will lower the body / throttle plate temp of the carb a considerable amount. 

Have a fun weekend

does fuel run out of that bowl if you pull the plug?

 
 Steve Metzger       Tucson, Arizona

fuel does NOT run out of opening. Bowl seems to be empty.

55Birdman  Hickory NC

Birdman

   From the pixs of your Holley I believe you have a 4150. The clue is the rear metering block on the 4150 vs the metering plate (thin with fixed jets) on the 4160. And see, a 600CFM is not too big for a good running Yblock.

Birdman, i was wondering if having that accel return spring pulling on warm fuel hose might cause future problems, or is it just tempory while you sort it out. best regards bill.

  AussieBill            YYYY    Forever Y Block     YYYY

 Down Under, Australia

The spring is a temp fix. No place to put it right now.

55Birdman  Hickory NC

My experience with Holleys is that they are always a tad on the rich side on idle and if you touch the trhottle when idling you are activating the biggest squirting accelerator pumps of almost any carby out there.

These carbs are generally bullet proof and set up properly are the equal of anything out there.

They only have a couple of crucial settings.

Float level, powervalve to suit engine, accelerator pump lever clearance and of course the primary air screws.

Carby shop salesman may lie to make a sale. If you number for the carby comes back as a 600cfm, then a 600 it is.

If you posted the number in your next reply we could check our parts numbers to confirm.

That is an unusual looking vacuum secondary carb with a secondary metering plate. They are usually only fitted to double pumpers. 1848 and 1850 which are the two most common vac sec carbs do not use this secondary metering plate.

A 4.5 power valve will not work on your engine unless you have a highly modified engine as the vacuum should never get that low to open the power valve under acceleration.

The 6.5 valve is the normal street valve.

The description you have given in your post suggests that the engine is flooding which usually points to float level/needle and seat problem but if the fuel is draining away quickly that will also be flooding your engine if it is leaking internally. That suggest the powervalve is faulty - they have a little spring loaded plunger which regulates fuel - this could be faulty though it would be lucky to run well at any time if it was.

I hope this, along with what has been written already gives you some ideas.

Regards

Rick - West Australia
Do Y Blocks Downunder run upside down? Gravity Sucks!!

Number stamped on carb is 1483. I believe this carb is a model 4150 . 600 CFM . Do you have float settings and any other settings for this carb?

55Birdman  Hickory NC