Odd 4bbl holley

C

chris142

New member
Was wandering around the local hot rod shop. I saw a 450 cfm Holley 4bbl carb with a mechanical secondary. Not a double pumper and no choke plate.

#9776

I live in the desert so not having a choke is not a problem. What concerns me is the lack of a secondary accelerator pump.

Anybody with a vacuum secondary Holley has tried the old screw in the linkage trick which just gets us a bad bog.

The counter clown said that since that carb is only a 450 cfm and has very small venturies it wont bog when the secondaries are opened.

I'm thinking that the 450 cfm would be perfect for a stock 392 that doesn't rev over 4000 rpm and the small venturies would make it very responsive.

But I don't want to make a $300 gamble. Has anybody tried one or have any info on one?
 
Run away from that list 9776. Totally unsuitable for any IH application used as a daily driver.

That 4160 series carb was offered many years ago as a so-called "universal off-road" application. It's actually marketed as 465 cfm. What that meant was...it was not carb approved for an oem replacement. And it's certainly not in the class of the current Holley "truck avenger" series.

With mechanical secondaries, there is no way to "control" throttle response in any kind of off-road use. Same for towing. Obviously yore countermonkee don't know squat about holly modulars.

With no choke system it's useless for anything other than a dual quad setup for a trailer queen. The choke system has nothing to do with ambient operating temperatures, a functional choke is imperative for any cold start scenario.

The absolute best Holley 4v modular carb application for a 345/392 is an electric choke list 80457 or it's companion manual choke version, the venerable list 1850. Both retail anywhere for around $280 and are vacuum secondary mixers.
 
I am currantly running an 80457s on it now. Never really been happy with it. But with the 268 comp cam that was never degreed I May be putting the cart in front of the horse untill I get the rebuilt 392 into the truck then I can see how the 80457s does.

I think that 600 cfm May be too much. I've played with the spring that controls the secondaries and never got much if any change. But again the cam May be the whole problem.

I've ran many years w/o a choke. 2 pumps of the pedal ,turn the key and they always fired up.:icon_redface: never had a problem.

I was really considering a 500 cfm edelbrock afb copy for it but then the counter clown showed me that odd Holley.

He is probly due for a bonus if he sells it this week?
 
chris142 said:
I
I was really considering a 500 cfm edelbrock afb copy for it but then the counter clown showed me that odd Holley.

He is probly due for a bonus if he sells it this week?
Click to expand...

The afb has absolutly no secondary air valve adjustability. The only way to tune the air valve is to machine the counter weight for opening timing. Not really for the unanointed.

Get a vac secondary 4bbl of any size from 450-750cfm and it will work. Just requires some basic tuning knowledge.

Like mm wrote a mechanical secondary carb is totaly wrong for a heavy truck.

Take that pos back and buy the right one. I could get it to run but I'd bet the guy who sold it to you could not.
 
Well, based on my limited experience (1 73 t/a; 1 stock engine), a "600 cfm" carb seems "correct" - I believe it is the "nominal rating" of the stock oem carb). But as michael mayben says -- cfm does not mean a lot in the IH world -- under 4000 rpm.

My mechanic replaced the oem carb on my 392 in 2001 with a 80457s. There is a notation of making adjustments, but there is no additonal parts (such as different jets) listed.

Mm wrote about putting a 80457s on his 392 (pickup) in beercan manefol -- an "old" thread in the carb forum.

"my" carb has performed fine for the most part (originally setup with "a little Rich idle mixture") -- almost 8 years; 70,000 miles; no rebuild.

But, my standards / expectations May be lower than yours.
 
Oh I didn't buy it. The clown at the hot rod shop said that it works great on his early mustang.........which happens to be about 3000lbs less than my 1210 so it might work ok on it.

I'm still waiting on my heads to come back from the machine shop so once that engine is put in my truck then I'll goof around with my 80457s that I have on it.
 
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