Carb Question?

punishercarr · 04-15-2007, 12:09 PM

How's my OLD'S buddies...great I hope...
Well my rebuilt comes out the shop hopefully this week...So now I plan on at out the 2 barrel Rotchester card(1965 Dynamic 88) and replacing it with another. This is my Question what would be the best best carb that would give me max hores (streetracing/weekends at the track), and would work best for 425. I was thinking an 750 cfm carb with the fitting intake manifold would be good.
Additionally, would the 750 work well with the new dual system?
Let me know yall,

Oldsmaniac · 04-15-2007, 03:34 PM

I have had good performance on a 425 in an 88 with a Holley 650 double pumper with mech secondaries.....this would be the speadbore. Dual exhaust is a must.

joe_padavano · 04-15-2007, 04:32 PM

You'll probably find proponents for all major carb brands. Carb choice really depends on what you plan to do with the car. A 65 Dynamic 88 probably isn't a regular drag strip runner.

Personally, for cars that are mainly street-driven I've had the best results with the Qjet. Yes, it's a pain to get it set up properly, but once you do, it runs great. It is by far the most sophisticated carb of it's time, with many internal systems to smooth the transition from one operating state to another. Unfortunately this added complexity is what turns most people off.

In my experience the Holley is primarily a WOT carb, and it's outstanding when used that way. In stop-and-go daily driving I have yet to be able to completely eliminate the part throttle hesitation. I can change the RPM where it happens, but I can't completely eliminate it.

I've also had good luck with the Carter AFB (now sold as the Edelbrock carb). This is an air valve design, similar to the Qjet, and is somewhat easier to tune.

frdmftr · 04-15-2007, 09:03 PM

Joe, I've got a 67 Delta 88 with a 425 (c head, dual exhaust) running the Edelbrock combo, carb and manifold. It's electric choke model and I'm very pleased with the performance. I've alway been a fan of the Carter AFB for the ease of tuning (needles and springs). It really comes on strong 45-50 miles per hour WOT!!!! Triple digits come up very quick (along with a bruised rib cage from the lady sitting next to me)

Happy moddin!

Dave

70Wcars · 04-16-2007, 06:28 AM

Quadrajet!!!!!! I run one on my race car; and great street carb as well.

04-15-2007, 12:09 PM	#1 (permalink)
punishercarr 425 Member Join Date: Mar 2007 Location: Florida Posts: 20	Carb Question? How's my OLD'S buddies...great I hope... Well my rebuilt comes out the shop hopefully this week...So now I plan on at out the 2 barrel Rotchester card(1965 Dynamic 88) and replacing it with another. This is my Question what would be the best best carb that would give me max hores (streetracing/weekends at the track), and would work best for 425. I was thinking an 750 cfm carb with the fitting intake manifold would be good. Additionally, would the 750 work well with the new dual system? Let me know yall,

04-15-2007, 04:32 PM	#3 (permalink)
joe_padavano Moderator Join Date: Mar 2007 Location: Northern VA Posts: 1,871	You'll probably find proponents for all major carb brands. Carb choice really depends on what you plan to do with the car. A 65 Dynamic 88 probably isn't a regular drag strip runner. Personally, for cars that are mainly street-driven I've had the best results with the Qjet. Yes, it's a pain to get it set up properly, but once you do, it runs great. It is by far the most sophisticated carb of it's time, with many internal systems to smooth the transition from one operating state to another. Unfortunately this added complexity is what turns most people off. In my experience the Holley is primarily a WOT carb, and it's outstanding when used that way. In stop-and-go daily driving I have yet to be able to completely eliminate the part throttle hesitation. I can change the RPM where it happens, but I can't completely eliminate it. I've also had good luck with the Carter AFB (now sold as the Edelbrock carb). This is an air valve design, similar to the Qjet, and is somewhat easier to tune. __________________ Joe Padavano 64 Jetstar 88 Conv 66 442 L-69 Conv 68 W-30 69 H/O 69 442 70 W-30 72 442 84 Custom Cruiser 86 Caprice wagon (w/307 Olds)

04-16-2007, 06:28 AM	#5 (permalink)
70Wcars Member Join Date: Jan 2007 Location: Texas Posts: 55	Quadrajet!!!!!! I run one on my race car; and great street carb as well. __________________ Dan S 70 442 W-30 4-speed 70 442 W-30 Post Coupe Bracket Race car..11.43 @ 3650lbs.

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04-15-2007, 03:34 PM	#2 (permalink)
Oldsmaniac Senior Member Join Date: Oct 2005 Location: NJ Posts: 432	I have had good performance on a 425 in an 88 with a Holley 650 double pumper with mech secondaries.....this would be the speadbore. Dual exhaust is a must.