Need help picking a carb - Team Camaro Tech
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post #1 of 6 (permalink) Old Apr 18th, 04, 08:32 PM Thread Starter
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Dylan
 
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Location: Boring, OR, USA
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Angry

Been a while since I posted here, just got back from Marine boot camp-oorah to any fellow Marines here. I think I'll be putting together a 400 sb here soon and was curious what my best and least painful (tuning wise) carb choice would be for it. My setup is

400 .030 over so 406
Vortec heads 1.94"in 1.5"ex
Comp Cams XE 284 Cam(unless you can figure a better choice)
Air-gap intake
Holley 110gph mechanical fuel pump
Headers
3.73 10-bolt
Viper T56

Ran this combo with an 850cfm carb on Dyno2000 and ended up with [email protected] and 430ft/[email protected]

Let me know if this is a good choice. I know I need better heads but thats down the road a bit. [img]graemlins/hurray.gif[/img]

1967 Camaro RS
#'s Matching 327-210 HP
Holley 700 Double-Pumper
Polished Air-Gap RPM Manifold
1.94"/1.5" Vortec Heads
6-Speed Viper T56
3.73 10-Bolt Posi
and bald rear tires
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post #2 of 6 (permalink) Old Apr 18th, 04, 08:58 PM
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Your existing 700 puddle dumper will be fine. You certainly don't need an 850...a 750 would be about perfect IMO.

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post #3 of 6 (permalink) Old Apr 19th, 04, 05:50 PM
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Bryan
 
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Q-jets are very good IMO. If you are willing to learn how to build and tune them, you will never go back to a Holley. Just got done with one on my Dad's Corvette. It is a 327, it gets out of it's own way and knocks down about 17 mpg around town. The freeway mileage should be even better.

Bryan
1967 Camaro 427 BBC, Viper T-56 6-Spd, Z28, Red w/ White Stripes
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post #4 of 6 (permalink) Old Apr 19th, 04, 07:44 PM
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One nice feature of the Q-jets are they are spread bore carbs. Spread bores give you the best of both worlds. Good charge velocity at part throttle and plenty of flow wide open. Is your air gap machined for square or spread-bore. I presume both options exist.

Dave
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68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #5 of 6 (permalink) Old Apr 20th, 04, 09:11 PM Thread Starter
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Dylan
 
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Ok, a little bit more I should have added to my first post. The 700 DP I have is actually a hybrid 750/650 straight off a racecar with a lot of work done too it. Its on my car right now with a 327 and its WAY too much carb. I also have my original Holley 650 that came on the car and I'm thinking that would be a better match. What do you guys think, 650 enough or will it hold back a lot?

1967 Camaro RS
#'s Matching 327-210 HP
Holley 700 Double-Pumper
Polished Air-Gap RPM Manifold
1.94"/1.5" Vortec Heads
6-Speed Viper T56
3.73 10-Bolt Posi
and bald rear tires
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post #6 of 6 (permalink) Old Apr 20th, 04, 10:31 PM
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Use your 650 since you already have it and spend a $100 for a Proform main body. It'll increase CFM and also make your motor more responsive. I am assuming that your 650 is a DP. I think your cam may be a tad too big, but close. What's your compression?

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