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02-05-2004, 09:45 PM
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#1 |
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Registered User
Join Date: Sep 2002
Location: long island, new york
Posts: 1,333
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holley 4160 carb jetting
i know this should be in drivetrain but it will bes seen more here, anyway i have a holley 4160 the # is 80508 and mortec says its jetts are (F)72 (R)plate 134-21 6.5 the problem is my moter is running really rich. i havent actually driven it yet but it smokes black and loads up at idle, i like to lean it out some what should i do or i should say what jetts should i purchase? the engine specs are
355cid LT-1 10.3-1 compression total seal rings comp xe274-h cam w/comp roller rockers vette ''492'' castings w/bowl port 2.08/160 manly ss valves forged + balenced rotating assembly 1 5/8 headers 2 1/2 exaust w/flows +h-pipe rpm airgap intake holley 750 dp msd distributer + 6al box tci street fighter trans w/2400stall 4:10 posi rear actually alot of people say w/this motor it shouldnt need to be leand out but obously it does thanks alot - kyle 
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1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door Last edited by special70gmc; 02-05-2004 at 10:13 PM. |
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02-05-2004, 11:28 PM
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#2 | |
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Bloo
Join Date: Feb 2001
Location: Barren County Kentucky
Posts: 6,283
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are you SURE thats a 4160?
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ASE Master Certified-GM Trained-Mechanic 1968 Chevy C30 157" WB Wrecker 1969 Chevy CST/10 SWB 1971 Chevy Custom/10 (first truck) 350, NV3500 5 speed 1971 Chevy K20 Custom Camper 4x4 350 TBI, SM465/NP205 1974 Chevy Custom Deluxe/10 1979 Chevy Custom Deluxe K10 farm truck beater 1989 Chevy K2500 Quote:
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02-06-2004, 12:04 AM
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#3 |
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Registered User
Join Date: Sep 2002
Location: long island, new york
Posts: 1,333
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the #'s on the choke horn on mortec.com say it is hummmmm.....
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1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door |
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02-06-2004, 01:36 AM
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#4 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Sounds more like you got a float problem. 72's should ok for the engine you have.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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02-06-2004, 01:58 AM
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#5 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Your sig. says it is a DP--80508 is a 750 vac. sec. Are you sure your carb is not flooding over? Is your choke hooked up--if not is your choke butterfly wide open?
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 02-06-2004 at 02:01 AM. |
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02-06-2004, 04:03 PM
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#6 |
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Yeah baby!
Join Date: Feb 2001
Location: United Kingdom
Posts: 436
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It's not the jets, stock jets are always fairly close to what you need. Only need to go up or down a couple of sizes to optimise.
It's either sticking floats, change needle valves and check levels. Or the power valve is leaking, change for new one with gasket.
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11.37 @116 |
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02-06-2004, 06:08 PM
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#7 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
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sounds like your power valve is blown out
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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02-06-2004, 07:43 PM
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#8 |
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Registered User
Join Date: Sep 2002
Location: long island, new york
Posts: 1,333
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its only got like 20 hours of use on it it came off my friends monte carlo but it was only on for 4 days when he relized it was too much for the 305. thanks -kyle
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1986 c-10 swb 5/7 drop 20'' coys 1958 belair 2door |
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