Carburetor questions

[Bjorn1230]

So I have a '68 300 with a 650 Holley Double Pumper which was rebuilt than sat for several years before I bought the vehicle. Not familiar with these carbs and I have a hell of a time getting it fine tuned. Question #1; Don't see a mechanical choke on it, is it missing? (see photos) #2 Is this carb original to the car? (see broadcast sheet). Just trying to clarify what I'm working with and what's (potentially) missing on the carb.

Thanks!

 

[live4theking]

That carb is not original to the car. It would've been a Holley 4160 or a Carter ???. The choke flapper is there, but it doesn't seem to hooked up.

In the lower picture the well, hole in the intake, is where a bimetallic choke was from the factory.

 

[Xenon]

The choke on that carb is being held in an open position by that rod..
And,, that carb is not original to the car...

 

[Bjorn1230]

Great that clarifies the situation a lot, and thanks for the quick response! Next question; What do the #36 and #56 decode into on the broadcast sheet (at the bottom)?

 

[live4theking]

I don't know what the 36 and 56 translate into, but since it has a "K" in the vin I would think that it had the Holley 4160 from the factory and the divorced bimetallic choke like the two 68 NYer's that I've had.

 

[Davea Lux]

Carb is an aftermarket replacement. Manual choke cable should go in place of the rod. You probably had a 4160 Holley on this car if it had the 350 horse engine as noted "K" on the broadcast sheet is for the 350hp engine.

Dave

 

[MacLebaron]

A little late, but these folks have already answered your questions. That carb has a manual choke that use a simple metal pull rod that you mount inside the car and operate when starting.
Not sure why the previous owner would have chosen that carb if the motor is stock, especially since it is a double pumper. Once the primaries are open approximately 40% the secondaries start opening using a progressive linkage system and dumping fuel in the motor regardless if it needs it or not.
I would bet money if you replace it with a good vacuum secondary design carburetor you will instantly notice a big drivability difference.

 

[Bjorn1230]

Awesome thanks for the replies, I will at this point be looking for a Holley 4160 unless you guys can suggest any other carburetors that will enhance smooth driving? How do the Edelbrocks work on these 440's?

 

[Davea Lux]

Awesome thanks for the replies, I will at this point be looking for a Holley 4160 unless you guys can suggest any other carburetors that will enhance smooth driving? How do the Edelbrocks work on these 440's?

If you want to keep the car bone stock, then yes 4160. The 4160 was a POS and had lots of issues with the secondaries failing to open. My personal choice for an aftermarket carb would be an Edelbrock at about 600 cfm.

Dave

 

[Bjorn1230]

Great I’ll look into it

 

[3175375]

If you want to keep the car bone stock, then yes 4160. The 4160 was a POS and had lots of issues with the secondaries failing to open. My personal choice for an aftermarket carb would be an Edelbrock at about 600 cfm.

Dave

^^^ what he said. Edelbrocks / Carter AFBs, are set n forget.

 

[RagTop66]

Awesome thanks for the replies, I will at this point be looking for a Holley 4160 unless you guys can suggest any other carburetors that will enhance smooth driving? How do the Edelbrocks work on these 440's?

I put a Holley 625 Demon on my 440 and it works great. They have them at Advanced Auto and I was able to do the order online, pick up in store and apply a 30% off coupon and save $50. It was $319 before the discount.

 

[cbarge]

If you want to keep the car bone stock, then yes 4160. The 4160 was a POS and had lots of issues with the secondaries failing to open. My personal choice for an aftermarket carb would be an Edelbrock at about 600 cfm.

Dave

My Holley on my old 68 NYer even after getting rebuilt was also a pos.
Like a Fender guitar the harder you play it the more you have to tune it...lol

 

[CBODY67]

Even BACK when the cars were newer, the OEM Holleys on Chrysler V-8s had a poor reputation for durability, needing annual carb "kits" and such. Didn't hear the same things from my Chevy friends who had similar carbs, though. Back then, too, the quality of the cork gaskets and such in the Holleys were not nearly what they now seem to be, from my experiences with the newer Holleys, 4160s and 4175 OEM-replacement carbs.

The cfm on the carb you have is "ballpark" with the OEM Holley 4160 from back then. BUT any double-pumper Holley is pretty much a drag race carb that CAN be used on the street, but was not designed for such. They were all manual choke carbs, too, with the "race bowl" dual-line set-ups.

As mentioned, that "rod" is holding the manual choke open, rather than the prior owner taking the time and expense to engineer a manual choke cable for the car. Holley did have an electric choke kit for many of their carbs.

MANY good options in the stock-type Edelbrock/Carter AFB and AVS, plus the Street Demon. All with electric chokes. Watch the sales at the big box places, plus the coupon deals (as mentioned). Should be some Labor Day sales soon?

Enjoy,
CBODY67

 

[boltupal]

Please post a clear picture of the stamped numbers on the front of the air horn.

 

[Bjorn1230]

 

[saylor]

i vote 750 eddie

 

[300C]

That carb is not original to the car. It would've been a Holley 4160 or a Carter ???. The choke flapper is there, but it doesn't seem to hooked up.

In the lower picture the well, hole in the intake, is where a bimetallic choke was from the factory.

These 68 300s came with a Holley 4160...lots of trouble with them as Chrysler spec'd these from Holley. Initial issues were warped metering blocks. Drove my dad nuts when he purchased ours in June '68. Eventually a rebuild and later a like replacement fixed the problem. Not too long ago, (same car!), I finally added an Edlebrock with an e-choke and all problems with starting, etc., were eliminated! Dad's probably looking down wishing he had put an Edlebrock on it instead of the Holley. He would have saved a lot of aggravation!

 

[ALRUI]

Holley's are great for performance but Carters (nowadays Edelbrock's) are better for reliability

 

[300C]

Awesome thanks for the replies, I will at this point be looking for a Holley 4160 unless you guys can suggest any other carburetors that will enhance smooth driving? How do the Edelbrocks work on these 440's?

Edelbrock works BEAUTIFULLY!!!!!!!!!!!!!!! Lose that Holley unless you need a shop paperweight!