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07-13-2005, 08:04 PM
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#1 |
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Registered User
Join Date: Apr 2005
Location: Houston TX
Posts: 76
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Bigger Carb
Okay earlier I had posted that "she is running" and I told ya'll that I had a 650 CFM carb on the 402. Well now I am going to get a 800 CFm do you think that might be a little much or not?
Also I have done head work (new springs and rockers) and Headers, HEI, and Performer 2-0 Edelbrock intake?
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99 nbs 5.3L x-cab Hypertech programmer True dual 1 chamber flowmasters magnaflow x-pipe 3" PA body lift 315/75/16 BFG All Terrian 15.3 @ 89mph 72' C20 402ci sc,lb in bed tool box, and new paint http://www.cardomain.com/memberpage/456511/1 |
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07-13-2005, 08:53 PM
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#2 |
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Senior Member
Join Date: May 2002
Location: NORTHEAST OHIO
Posts: 494
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that's a lot of cfm's with no serious head work
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07-13-2005, 09:26 PM
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#3 |
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Blank
Join Date: May 2005
Location: Southington, CT
Posts: 221
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stock pistons? cam?
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 1969 lwb 4/6 drop 17x8-18x10 torque thrust II's 327-420hp 2004R 3.73 posi. 1977 Corvette 350-375hp 4speed, silver show car. 2002 S10 xtreme, work truck 2004.5 VW jetta GLI 1.8T 6speed, weekend warrior. 2013 Audi A3 TDI, the wife's car |
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07-13-2005, 09:29 PM
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#4 |
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The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,468
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I have alot of head work, my motor is conservativly rated at around 450hp,
and when I was having issues a while back everyone said my 750 dp was a lil big for my motor, but I don't think so, I ran a 850 vs on my old p/u w/ a stock 400, stock heads, etc...... and it ran like a scalded dog, beats me 
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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07-14-2005, 03:54 PM
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#5 |
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Registered User
Join Date: Jun 2005
Location: Independence MO
Posts: 87
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CID x max rpm / 3456= all the cfm you need. You can then take the result times the Volumetric efficiency of you motor. With out getting to in depth here is an idea of different VE's
stock=.85 upgraded stock with ported heads=.90-.95 aftermarket heads =.95-.100 After market race heads=.100-.105 Full race port setup=.110 There are many other variables in figuring VE, but this formula and those head specs will get you very close to the correct carb size
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72 C10 longbed 5/7 drop, Telstars, 350/th400(for now) 69 Chevelle SS396 (427/th400) 88 K5 on 35's (355/700R4/208) |
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