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05-08-2002, 08:27 PM
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#1 |
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68cst_ss490
Join Date: May 2001
Location: edmonton,canada
Posts: 1,363
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Carb. help needed.
I have a 350 with a L-79 cam, 9.5 comp headers, with a performer rpm intake. Edelbrock recommends a 1407(750cfm). Is that too much carb for this combination???? Any help would be great.Or should I go with the 1406(600cfm)???
------------------ Dean edmonton,canada 68 c10, project in works,350, th350, plain jane. SLOW AND STEADY GETS THE PANELS READY http://communities.msn.ca/MyChevytruckpage
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Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973 |
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05-08-2002, 08:31 PM
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#2 |
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Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Valve size? If you're running 202's, you should be OK.
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05-08-2002, 08:34 PM
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#3 |
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68cst_ss490
Join Date: May 2001
Location: edmonton,canada
Posts: 1,363
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1.94's. the price diff on the 2 is 10 bucks so thats no difference to me. I just want the engine to perform well
------------------ Dean edmonton,canada 68 c10, project in works,350, th350, plain jane. SLOW AND STEADY GETS THE PANELS READY http://communities.msn.ca/MyChevytruckpage
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Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973 |
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05-08-2002, 08:58 PM
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#4 |
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Senior Member
Join Date: Dec 2001
Location: Redding,CA...USA
Posts: 4,736
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the 1406 has an electric choke...the 1407 doesnt..i think...I myself would of gone for the 750...but trust me, I always think bigger is better, and that aint usally the truth.
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA |
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05-08-2002, 09:03 PM
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#5 |
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68cst_ss490
Join Date: May 2001
Location: edmonton,canada
Posts: 1,363
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I think the same way but i want to be sure I buy the right carb for my engine 750 or 600 cfm??????
------------------ Dean edmonton,canada 68 c10, project in works,350, th350, plain jane. SLOW AND STEADY GETS THE PANELS READY http://communities.msn.ca/MyChevytruckpage
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Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973 |
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05-08-2002, 09:06 PM
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#6 |
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CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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You didn't say what gear you are running,that will make a difference. The smaller carb should give more bottom end,the bigger carb more top end. If you are runnin 4.11's or bigger I would go with the bigger carb. The edelbrock really won't over carb the motor because it is an air valve secondary design. It will only open as much as the motor will take. But the smaller carb will give you a little atvantage off the line if you don't have enough gear.
------------------ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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05-08-2002, 09:10 PM
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#7 |
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68cst_ss490
Join Date: May 2001
Location: edmonton,canada
Posts: 1,363
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3:73 posi in the rear. it was an original 6cyl 3 on tree truck.
------------------ Dean edmonton,canada 68 c10, project in works,350, th350, plain jane. SLOW AND STEADY GETS THE PANELS READY http://communities.msn.ca/MyChevytruckpage
__________________
Dean edmonton,canada a winter wonderland 2005 Chevrolet Avalanche LT cold air intake, performance exhaust, Comp cams cam, jba shorty ceramic headers. http://www.cardomain.com/ride/3090973 |
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05-08-2002, 10:09 PM
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#8 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Go for the gold man, get the big one.
You should be ok. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com My name is Andy...not Randy...I'm in Ohio...Not Illinois...close enough? Columbus Ohio |
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05-08-2002, 10:32 PM
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#9 |
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Registered User
Join Date: Nov 2000
Location: Victoria, Texas
Posts: 71
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Dean, I have run the 1405 (600 cfm) and 1407 (750 cfm) carburetors on my ZZ4 crate engine with the AirGap RPM manifold and HOT cam. I tested the carbs before and after installation of AFR 195 heads. I also ran both carbs with the electric choke option. The only significant advantage of the larger carb (that I noticed) was slightly more power above 6000 rpm; conversely, a disadvantage of the larger carb was a distinct and irritating lag at lower rpms. A great deal of Edelbrock-inspired tuning efforts failed to completely remove this symptom. IMHO, try the smaller carb first - fuel metering is superior for this cid range.
p.s., Edelbrock did recommend the 750 for my application, but I'm still running the 600, with better results. Tim |
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