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03-04-2015, 04:10 PM
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#1 |
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Registered User
 
Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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what timing are you running?
Looking to hear what timing you'rE running along with what type of engine.
Initial timing? Total timing? Vac advance or no? hooked to ported or manifold vacuum? I'll start : 350 / 330 Hp with Vortec Heads PART # 19210008 12 initial around 32 total vac advance hooked to ported vacuum. truck isn't running great lately, either having carb or timing issues....going to be playing with it soon....looking to hear the spectrum of different timings on these trucks.....I know it varies and that all engines like different timings. Thanks in advance!
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1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559 Last edited by 1972BlueC20; 03-04-2015 at 04:19 PM. |
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03-04-2015, 08:28 PM
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#2 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: what timing are you running?
Engine, 427 BBC, initial timing 14 degrees btdc, 34 degrees total all in by 2800 rpm, vacuum advance, 12 degrees, hooked to manifold vacuum
335 hp, 470 ft/lbs torque (factory rating) Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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03-04-2015, 08:59 PM
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#3 | |
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Registered User
Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Re: what timing are you running?
Quote:
Hey Jim! So if your running 14 initial with the vac advance hooked to manifold (constant @ idle) which produces 12 degrees, is your reading at idle 26 degrees?
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1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559 |
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03-04-2015, 08:47 PM
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#4 |
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Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: what timing are you running?
Engine 462 CI, 18 initial, 40 all in at 3000 RPMs. No vaccum advance.
459HP/495TQ.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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03-04-2015, 08:56 PM
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#5 | |
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Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: what timing are you running?
Quote:
572 big block, 630 HP, 650 Ft-Lbs torque |
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03-05-2015, 12:52 AM
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#6 | |
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Registered User
Join Date: Jun 2014
Location: Shingle Springs, CA
Posts: 869
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Re: what timing are you running?
Quote:
Whats the details on your carb? I would get that figured out first before working on timing. What dist are you running? HEI? |
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03-05-2015, 10:10 AM
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#7 | |
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Registered User
Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Re: what timing are you running?
Quote:
It's a Holley 670 street avenger with electric choke and vacuum secondaries. I was told by several people on the board to always rule out timing issues before changing parts in a carb. I've done all the adjustments on the carb. The only things left to do to the carb would be to tear into it and change squirters, powervalves ect....I'm having similar issues with this carb and another edelbrock carb so I'm beginning to think it's something other than the carb.
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1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559 |
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03-05-2015, 10:20 AM
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#8 | |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,568
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Re: what timing are you running?
Quote:
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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03-05-2015, 01:48 PM
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#9 |
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Registered User
Join Date: Jul 2012
Location: Ft Wayne Indiana
Posts: 1,205
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Re: what timing are you running?
Engine, pretty much stock 350. 14* initial, vac advance on manifold vac, and recurved mechanical advance.
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71 K20 64 GMC mud truck |
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03-05-2015, 01:55 PM
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#10 | |
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Registered User
Join Date: Jun 2014
Location: Houston, Texas
Posts: 722
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Re: what timing are you running?
Quote:
cool, thanks for the reply. So correct me if I'm wrong but since you're running to the manifold port for your vac advance wouldn't you have 14+whatever you vac advance produces at initial idle? Thanks,
__________________
1972 Chevrolet C20 Cheyenne Custom Camper LWB - 350 / 330 HP GM Crate - TH350 / Mild Shift Kit - Dark Blue / Medium Blue - Paint Code 559 |
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03-05-2015, 02:18 PM
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#11 | |
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Registered User
Join Date: Jul 2012
Location: Ft Wayne Indiana
Posts: 1,205
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Re: what timing are you running?
Quote:
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71 K20 64 GMC mud truck |
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03-05-2015, 04:17 PM
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#12 |
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Registered User
Join Date: Nov 2014
Location: Columbiana Ohio
Posts: 1,210
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Re: what timing are you running?
14* at idle not sure what it is after that.
350 zz3 heads and lopey cam and 600 holey vac sec with electric choke. I dont think it likes that because I have a slight stall from idle to wot. Will try and work that out when its back in the truck.
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"Hey... its only time and money right? Just do it." 67 Short Bed under major construction http://67-72chevytrucks.com/vboard/s...=651356&page=8 |
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