Which carb to run?

[UtlGoa]

I'm having a hard time figuring out which carb to run. I have a 472 Ford, four bolt main, Scj heads, stainless steel valves, Clay smith cam #C-292-8-B, with thru transom (log) exhaust. I'm currently running a 750 Holley w/ vac secondaries. Is this carb suffiecent for my setup, or should I move up to a 850Dp?
When I'm just cruising the motor seems to surge, like it's starving for fuel. I put a new carter mech, fuel pump on last year, but that did not seem to help. Any help. or advise would be appreciated.

[Hotcrusader76]

For cruiseing around that 750 should work just fine. You'll never use the potential that motor has with that carburetor though.
The best out of the box carb for that combo is an 830HP Annular. Otherwise have a carburetor specialist custom build you a 850DP/HP or 950HP.
If you purchase any carburetor with adjustable bleeds make sure you also purchase a slew of different air-bleed correctors. Those HPs out of the box are usually very rich.
Call me if you need any help. Good luck.
~Ty

[UtlGoa]

Hotcrusador,
I was hopeing you would have some advise. What is the 830 annular? And how much do they run. I know this motor should move my 18'6" bahner bubbledeck, but it just does not seen to be cutting it. Thanks for the advise.

[Hotcrusader76]

The 830 Annular is originaly a Nascar designed HP series carburetor. The throttlebody is similar in size to a 750s base but tapers up into a larger venturie main body, sounds backwards I know but it offers a great low end torque when coupled with an Annular booster.
The Annular booster offers the greatest signal strength over all other boosters. This enhances your low-end response and bascially allows a larger CFM carburetor to be used on your engine set-up. Also note that your jetting will be significantly lower with annular boosters over a common drop-leg version.
I offer the 830HP Annular carburetors for $750.00 each in our Stage 3 configuration. This is a custom built and blueprinted carburetor that is offered in many different powdercoat colors and anodizing options.
If you're looking for some hidden torque increases from your current set-up then by all means look into an 830 Annular or even a 950 Annular.
I can be reached at (877)TPC-CARB
~Ty

[UtlGoa]

Hotcrusader,
Let me ask you this. If I did stay with the 750vac would it help to get rid of the meter plate and put in a block? Also what size jets would you recommend for my setup. I live at the river(Blythe) so it's not a problem trying out new combinations.
Thanks, John

[sleekcraft76]

what rpm does it surge at? i have the same carb and intake mine surges at 3000 to 3500 and can't solve why it surges.

[UtlGoa]

Sleekcraft,
It surges right around that same rpm. I'll be cruising and it will just start surging. Sometimes it even coughs through the carb. It's kinda irritating.

[Hotcrusader76]

Yes the 3310 Vacuum secondary carburetor has alot of potential to be a real performer. When I overhaul these carbs to our Stage 3 build they receive the rear metering block, 4-corner idle for a better off-the-line response, mult.springs for tuning, new drop-leg modified boosters (like the double pumpers), and a modified vacuum circuit so that they rely on the primaries venturie pressure vice the baseplate.
There is a notable difference from the stock 3310 to a TPC modified 3310-Weekend Warrior. Crisp throttle response, consistent fuel mileage, and adjustable rear jets. Basically you end up with a hotter version of the 780 4150 Vacuum secondary.
As far as jet sizes that all depends on the amount of fuel your motor needs to keep it running at a nominal a/f ratio. Now once she's dialed in I can help you with jet changing as per weather changes; humidity, air density, etc.
~Ty
This 750 VS here didn't have the boosters replaced but it received the 4150 conversion, rear jet extensions/float, MAX jets, modifed vacuum circuit, milled choke horn, and Chrome treatment.
http://www.tpcracing.com/images/Orange3310_300.jpg http://www.tpcracing.com/images/Jons3310_200.jpg
[ February 24, 2003, 05:55 PM: Message edited by: Hotcrusader76 ]

[UtlGoa]

Hotcrusader,
So my best bet would be to go to a bigger carb? My heads, Scj, have some huge valves. Do you think the 750 is flowing enough for them?

[Hotcrusader76]

my first double post eek!
[ February 24, 2003, 09:51 PM: Message edited by: Hotcrusader76 ]

[Hotcrusader76]

Ok, I think you getting a little confused here. It all depends on what you intend to use this engine for.
You can run a 3-circuit Dominator, a 750VS, or even a stock 850! :D It just depends on what your goal is, how well it's tuned, and your budget. Bottom-line.
Why spend thousands on a well built motor only to "chimp" out on a cruddy carburetor. It's sort of like a good steak with no sauce...

[UtlGoa]

How much does your shop charge to convert a 750 to like one in the picture? less the chrome goodies, already have all that on mine.

[Blown 472]

Good steak should not need sauce. :D

[Hotcrusader76]

Please call me or e-mail me @ tdlofstrom@tpcracing.com
Thanks
Ty

[Blown 472]

Hotcrusader76:
Please call me or e-mail me @ tdlofstrom@tpcracing.com
Thanks
Ty About a steak?

[Hotcrusader76]

Word has it that Cosco has 2.5 lbs lobster tails for around $45.00 each and because I am overdue for giving MsHotcrusader a "Surf-n-turf" meal it looks like I am heading out to shop.
Stay tuned...