Is this carb big enough?? - Team Camaro Tech
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post #1 of 7 (permalink) Old Feb 6th, 05, 01:24 PM Thread Starter
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Don
 
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Location: Redding, CA, 96003
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Question

my engine has trick flow 195s,10.3 comp. airgap and 1 inch spacer. and xe 274 comp cam,1.6rockers. im running a holley 670 street avenger series carb. im thinking of getting a 750 with mechanical secondaries. i wanted to know if a 750 would make a difference? i would appreciate any help. thanks

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #2 of 7 (permalink) Old Feb 6th, 05, 01:33 PM
 
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Yes it will,but it depends on the rest of your combo as to good or bad.Trans?,stall?,gear?.Is the 670 not doing the job or are you just experimenting?How do you like the xe274 cam? does it have a good lope at idle?

Ron
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post #3 of 7 (permalink) Old Feb 6th, 05, 01:41 PM Thread Starter
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Don
 
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the lope is soooo nice at about 800 rpm its has a 2800 stall w/ lockup on a 700r4 from bto with 3.73s and the 670 isnt giving good top end power.

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #4 of 7 (permalink) Old Feb 6th, 05, 01:58 PM
 
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With that combo the 750 IMO would help ya,I see your other post on the 1" spacer if you go with the 750 keep the spacer to help on the bottom end . [img]graemlins/thumbsup.gif[/img]
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post #5 of 7 (permalink) Old Feb 6th, 05, 04:05 PM
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Brandon
 
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Go with the 750, but keep it a vacuum secondary. The tranny will use the vacuum seconds to better advantage then it would a manual second. JMHO

Brandon J. licence 1NASTY67

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post #6 of 7 (permalink) Old Feb 6th, 05, 06:54 PM Thread Starter
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Don
 
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thanks guys

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #7 of 7 (permalink) Old Feb 8th, 05, 01:43 PM
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CID * RPM * VE / 3564 = CFM

If you have 100% VE (which is rare) at 7000 RPM (which is high for all but a well balanced motor) your CFM on a 350 SBC would be 708CFM. A more realistic figure would be 350 * 6500 * 0.95 / 3456 which is 625 cfm. So IMHO, a 650 CFM vacuum secondary carb is ideal for a 350 SBC with an automatic tranny.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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