350 holley on pinto

Holley carbys, specifically the 2300 (your 350), 4150, and the 4160 are very basic carbys. But, they work quite well even on mismatched applications (I had a 650dp on a 265 hemi 6) and are cheap and easy to source parts for. They are also a good carby to learn on, you can easily modify them a little or a lot.

There is only a couple of basic gudelines/rules to follow and you can't go wrong if you want to give it a go.

quote:

---

Originally posted by maxrs

Angular discharge Holley carbs work well on Pintos.
Stay away from the Holley's with mechanical secondaries.

---

I think you mean annular booster??

There is nothing wrong in using a mechanical secondary carby apart from the fact the original question regarded a 350 and a mechanical secondary holley doesn't really come smaller than a 600dp. Double pumpers are ten times easier to tune right.

I heard somewhere they leak on right (maybe left) hand corners.
 
Cheers
 
Matt

Holleys are a good basic carby to learn on. In stock form they will just about muddle through anything.

A 350 Holley would be great on a mild power up. When you're chasing big hp I personally would not use a Holley. Bigger 4 barrel carbies will have weaker booster signal than say a multi dcoe setup. This is due to the fact that on dcoes each cylinder is feed by only one barrel. With the Holley each cylinder is pulling from a common plenum as well as fighting each other, amongst many other variables.

Leaking on turns would be due to a misadjusted float level or missing float vent tube. On severe applications you can slip rubber hose over the vent tube to extend it.

If the Holley was such a crap carby you would have to ask why it is probably the most modified, copied, repaired, and tuner supported carby in the world!!

Monaroman68

holy smokes guys got a shock with the holley , had a couple 350's from our holden speedway days and whacked one on ran staight up and idled pretty good .vacuum is quite low so i changed the power valve to suit which is a 3.5 and running very good (running avgas) havent had to dyno yet but we have our own track and i'm having trouble telling the difference in power from the 45's thing flys . waiting on getting a 4bbl to try also when dyno time comes around .looks like might be selling the 45's very soon.

 
Whilst the 350 works very well on a pinto, if it's better than the twin 45's on there, then something is very wrong with the set up.  I've never had a holley make better power than the correct weber set up.
 
Woz

Monaroman68

Wozzah i wouldn't say they are better but was very surprised at how well it does go . I've already spent a fortune on trying to get the webbers tuned right and had several dyno shop have a crack but all it seems to be doing is costing me money. Think my biggest mistake was buying secondhand setup to start with and trialing the holleys has cost me nothing as i have several different ones here as we have been racing speedway with holleys for years on holden 6 and ford 6's. If no of this worksout i may bit the bullet and buy new set of 45's or even look at injection.

 
The new webers aren't as good as the old ones.  The biggest trouble with Webers is that its hard to find someone that knows what they are doing with them.  I've had heaps come to me after being supposedly "tuned and spot on" when in reality they're no where near it.  Once you have them right there is no going back to anything else, and they can be sized and jetted to suit any application.  With injection you still have similar problems, getting someone to do a decent tune.
 
There is no doubt a Holley works very well, and is cheap and easy to set up.  It may feel better because of increased air speed over the 45's.  If thats the case, you may have an airspeed issue with either the 45's being choked incorrectly, or they are simply too big for the horsepower you're making.  If thats the case it will be difficult to get the 45's right.
 
I just finished off an LC GTR torana with a set of 45's on it, mild engine.  Someone else had had a crack at them before me and the tune was terrible for a relatively mild engine, it was very doughy down low and had no top end either.  I played around a bit with the jetting and couldn't get a decent fuel curve either, it kept leaning out top end no matter what I did.  The carbs had 36mm chokes in them that someone had machined (not a bad job either).  I machined up some CNC's 34mm chokes for them.  The difference in the car was incredible, and the jetting became instantly back to reality and changes in the jetting behaved exactly how it should have done.  The venturis were simply too big and upsetting the air speed.
 
You need to find someone who knows their way around a Weber carb properly, once you have them right you'll be fine
 
Cheers
Woz