Carb size recommendation

[Cuda 1964]

Hi everyone
Looking for carb size recommendations I have a 318 .60 over 4in stroke trick flow 190 heads comp cam XE262-10 eddy air gap headers 2 1/2 exhaust 904 auto with a reworked converter 26in rear tires 3.23 gear posi rpm set at about 5500 in a 64 barracuda right now I have a 650 holley

Thanks in advance for your expertise knowledge

 

[RustyRatRod]

750DP, but one like a QFT that has lots of adjustability.

 

[Ricks70Duster340]

A lot depends on what you want to do with the car. @318willrun can speak specifically to what may work for you.

 

[318willrun]

A lot depends on what you want to do with the car. @318willrun can speak specifically to what may work for you.

750 DP. I've had good luck with Brawlers, but I love a Holley 4779 here too.

 

[Cuda 1964]

750 DP. I've had good luck with Brawlers, but I love a Holley 4779 here too.

Just want to run 1/8 or stop light to stop light not looking for 200mph lol

 

[Ricks70Duster340]

I've used vacuum secondary carburetors on many of my engines (from 318 to 440's) for almost 50 years. Tuned properly they are excellent performers and give respectable fuel economy. The secret to the performance of those carbs is to tune the secondary diaphram spring to bring the secondaries in without a bog. If you want to get the absolute best performance out of a setup for racing you should look into a double pumper like 318willrun suggested.

 

[Cuda 1964]

I've used vacuum secondary carburetors on many of my engines (from 318 to 440's) for almost 50 years. Tuned properly they are excellent performers and give respectable fuel economy. The secret to the performance of those carbs is to tune the secondary diaphram spring to bring the secondaries in without a bog. If you want to get the absolute best performance out of a setup for racing you should look into a double pumper like 318willrun suggested.

I do have a 650 HP holley right now was just wondering if a 750 might give me a little more performance or not

 

[Garrett Ellison]

A 750 DP will feed it well enough, but a 397 stroker with TFS heads will respond well to any large 4150 style carburetor. Yes, a 750 will be worth more performance than a 650, but not as much as something in the 800 cfm and up range.

 

[318willrun]

Just want to run 1/8 or stop light to stop light not looking for 200mph lol

If you don't want more performance and it runs good now, stick with your 650 Holley. Is your 650 a vacuum secondary or mechanical secondary?

 

[Cuda 1964]

If you don't want more performance and it runs good now, stick with your 650 Holley. Is your 650 a vacuum secondary or mechanical secondary?

I would like more performance and the 650 has mechanical secondaries

 

[318willrun]

I would like more performance and the 650 has mechanical secondaries

Then I would install a good 750 DP

 

[Cuda 1964]

Then I would install a good 750 DP

Thanks for all the advice and info going to order a 750

 

[Oldiron440]

I’ve had a smaller Ford small block on the dyno and tested multiple different carbs from 600 dp to 850 dp making a total of eighteen pulls. The small displacement 292 inch W engine liked the 750 cfm the best making 8 hp and 4 tq more than the 650 dp. This engine has a max power at 6200 if that makes any difference but I would think with more displacement the gain could be more.

 

[forphorty]

650 and 700 Holleys can easily be made into a 750 with a main body swap. Proform Parts 67100C Proform Main Bodies for Holley Carburetors | Summit Racing

 

[Garrett Ellison]

A 750 is probably the sweet spot with smallish XE262 cam. That engine can eat an XE 275HL and ask for more...

 

[273]

If looking for more performance that cam is holding that engine back.