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I had completely forgotten, or perhaps I never knew, that the air cleaner base for a 1964 365 hp engine does NOT fit the carburetor for a 1964 300 hp engine.
I got my nice, new repo 365 air cleaner base and tried to set in on my 300 hp engine.
OOPS!.
Well, somewhere down the line I am seriously thinking about a Holley Sniper system. Perhaps I can use it then.
OK, in the meantime, what other options are there.
1. Replace intake and carb with 365 hp components.
2. Get carb to air cleaner adapter
3. Replace carb with different carb that fits 300 hp manifold, and has larger air cleaner base opening. What would that be?
The Carter AFB and the Holley had different air horn diameters during this time (as you now see). However Carter went to the larger air horn size in the late 1960's. From then on the diameters were the same.
Edlebrock AFB carb is the later Carter AFB design and has the larger opening........but you need to check the bottom throttle plate openings as well to make certain they will fit the 300 HP manifold.
That may be the way to go if your manifold will accept it. Although installing the Holley and factory aluminum manifold is also nice, but probably much more costly.........and may not provide much additional HP.
Larry
Last edited by Powershift; May 10, 2018 at 08:55 AM.
The Carter AFB and the Holley had different air horn diameters during this time (as you now see). However Carter went to the larger air horn size in the late 1960's. From then on the diameters were the same.
Edlebrock AFB carb is the later Carter AFB design and has the larger opening........but you need to check the bottom throttle plate openings as well to make certain they will fit the 300 HP manifold.
That may be the way to go if your manifold will accept it. Although installing the Holley and factory aluminum manifold is also nice, but probably much more costly.........and may not provide much additional HP.
Larry
Thanks Larry.
I will probably hold off on doing anything other than perhaps an air cleaner adapter until I decide whet the final solution is going to be.
You just need to know the two sizes you are trying to accommodate and you should find an inexpensive solution. Just be careful of height changes so you don't raise the air cleaner too high and hit the hood.
You just need to know the two sizes you are trying to accommodate and you should find an inexpensive solution. Just be careful of height changes so you don't raise the air cleaner too high and hit the hood.
Good luck... GUSTO
I have one of those adapters SOMEWHERE in my garage. I'll find it eventually. This adapter does raise the air cleaner about 1/2 inch, and that may be a clearance issue.
I am thinking about having one machined out of aluminum that doesn't significantly increase the air cleaner height.
Last edited by emccomas; May 10, 2018 at 09:45 AM.
I have a 63 but I assumed that the 64 300hp has a Carter AFB (3721S style or close to it) ... is that not the case on your engine ?
Yes, my 64 has a Carter AFB. But the 365 air cleaner is for the Holley equipped 1964 engine, which has a larger air horn (4 7/32 vs 5 1/8, as I recall).
The 1963 340 hp air cleaner is not the same as the 1964/1965 air cleaner.
A 1963 340hp air cleaner base would probably work, with some mods.
Yes, my 64 has a Carter AFB. But the 365 air cleaner is for the Holley equipped 1964 engine, which has a larger air horn (4 7/32 vs 5 1/8, as I recall).
The 1963 340 hp air cleaner is not the same as the 1964/1965 air cleaner.
A 1963 340hp air cleaner base would probably work, with some mods.
The 64-65 base will have the large tube facing the rear towards the back of the block. The 63 only base will have a smaller vent tube facing forward towards the oil filler tube.
The 64-65 base will have the large tube facing the rear towards the back of the block. The 63 only base will have a smaller vent tube facing forward towards the oil filler tube.
Is the air horn opening on the 63 different that the air horn opening on the 64-65 base?
Is the air horn opening on the 63 different that the air horn opening on the 64-65 base?
I don't know the actual dimensions but 63 would have to be different than 64-65. For a 340 HP 63, the carburetor was an AFB but 64-65 used a Holley on the 365 HP.
Carter made a large airhorn 4bbl with number 3783S. They were standard equipment on the '64 & '65 400hp 409s and also a service replacement so they are fairly plentiful.
I am lost at this point....does the car have its factory carb for a 300hp 64 motor ?
If so then a repro/original correct air cleaner for that configuration should fit...
I am lost at this point....does the car have its factory carb for a 300hp 64 motor ?
If so then a repro/original correct air cleaner for that configuration should fit...
What am I missing ?
I think I understand what Ed is trying to do. He has a 300 HP with a Carter AFB but he wants to install a chrome air cleaner assy from a 365 HP instead of the black dual snorkel that a 300 HP would have.
I think I understand what Ed is trying to do. He has a 300 HP with a Carter AFB but he wants to install a chrome air cleaner assy from a 365 HP instead of the black dual snorkel that a 300 HP would have.
OK then. I didn't realize Ed had gone rogue with his setup...
In that case......
Timely subject. I have a '63 340HP air cleaner assy and Carter AFB 3721S that I have listed on FleaBay so I just researched this and happen to have great pics to illustrate. I have to say that I had a hard time finding much info online about the '63 340HP air cleaner. At any rate, the Carb opening in the base is approx. 4-1/4" and the vent tube doesn't protrude at an angle like the 64-65 365HP air cleaners.
The 1st pic is the base sitting on the Carter AFB 3721S. The 2nd pic shows the 63 only style vent tube configuration.
OK, in the meantime, what other options are there.
1. Replace intake and carb with 365 hp components.
2. Get carb to air cleaner adapter
3. Replace carb with different carb that fits 300 hp manifold, and has larger air cleaner base opening. What would that be?
Ideas?
4. Do what I did.
Get a 4" vent pipe adapter. This is the same size as the air cleaner base. File the two areas where the carb protrudes into the circle so that it sits down onto the carb flange. You also need to cut a slot to clear the linkage. The placement will be self-evident with you put the adapter in place.
This now serves as the new flange for the air cleaner and the air cleaner sit down onto it. A piece of split rubber around the base of the air cleaner,or even the stock gasket for the bigger assembly will ensure a tight seal.
As an added bonus, you get a heat shield and this takes virtually no additional space necessary for hood clearance.
Last edited by toddalin; May 10, 2018 at 08:39 PM.
I am lost at this point....does the car have its factory carb for a 300hp 64 motor ?
If so then a repro/original correct air cleaner for that configuration should fit...
What am I missing ?
You're not missing anything. He may be missing the coin to do this. These are quite pricey.
I have the factory dual snorkel air cleaner on the car now.
I want to add a little pizzazz to the engine compartment.
I am also installing Corvette script aluminum valve covers (straight hole, no seam) that have just been restored by Fred Hudson.
I am not looking to add horsepower, just looks.
The 4 7/32 to 5 1/8 adapter puts the air cleaner too high. It hits the bottom of the hood.
So, the options are:
1. Get an adapter that does not raise the air cleaner (might have to have one made).
2. Change carb.
3. Change to EFI (I am thinking about Holley Sniper system).
4. Change intake and carb.
5. Keep what I have now.
I am leaning toward option 2, sometime well in the future.
Last edited by emccomas; May 10, 2018 at 08:10 PM.
OK, I am officially a moron
