4300 Carb Replacement Advice Needed

[DanE]

I see this carb engineered to be the best of the "bowl" carbs, and there were some decent ones. The "Thermoquad" for example. On a dual quad intake, you would have 1250 cfm for your max power and you would cruise around on the 4 small primarys. Easy to tune and you do not have to pull the carbs off the intake to change jeting or run the carbs sideways. No more having to drain float bowls to change jeting. I'm talking a high performance street engine. I'm willing to try them. And there are a lot of 460's running around with 600's on them. my motor home for instance. And it is going to get a 625 Demon and see if will return an increase in HP and fuel economy.

[68xr7cat]

Originally Posted by 429TORQ

Just looked at the carby, it looks like it will only fit the 68-73 bbf intake with a 1/2" or 1" open spacer(or the 3v spacer Randy mentioned). I had no idea that it had that "married" style secondary plate. If his '74 460 has the "big" ford spreadbore pattern(4350 style) I don't know what the deal will be.

Just looked up the carb applications. What I can see 1974 is 4300. In 1975 everything is 4350 except some of the "early" 1975 trucks having the 4300. Guess the OP best verify he has a 4300.

Steve

[The Big One]

Originally Posted by 68xr7cat

Just looked up the carb applications. What I can see 1974 is 4300. In 1975 everything is 4350 except some of the "early" 1975 trucks having the 4300. Guess the OP best verify he has a 4300.

Steve

Yes, verified as a 4300, not the 4350.

[rmcomprandy]

Originally Posted by The Big One

Thanks Randy. So if I were to consider the route you've suggested, would this barrel type plate be custom made or do these already exist?

Thanks everyone, this is all great information and very helpful! Please keep your opinions and advice coming.

They exist OR making one is pretty easy ... also Holley made a zinc spacer especially for doing this very thing.

I have a few, send an IM if you are interested.

I don't know of anything more production than using an 80's FORD OEM Holley carburetor.

I don't know about Motorcraft carb numbers as I went by your description of a 2" spread secondary bore carb. If it is NOT this type carb you won't need any special adapter for anther brand carb with a 1 9/16" throttle plate or smaller.

[68xr7cat]

The 4300 is the one you can bolt a 4150 holley in its place. Don't think he would need any adapters or anything.