what should the timing be at? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dropped72shortbed · 03-28-2002, 06:56 PM

i have a 72 c10 w/ 350. i believe its stock internally. just headers and intake, it does have hei.

timing is at 5deg BTDC where should it be around?

*Randy70C-10* · 03-28-2002, 07:09 PM

That's probably pretty close. If you don't get detonation during acceleration, or backfire during decceleration, I'd leave it alone.

------------------
Yeah, that's right. My name is Randy too!
WWW.Randysrods.freeservers.com
1970 Chevy C-10 shortstep
30 Ford Model A Coupe 4 inch chop, 350, GMC 671 blower-Hell yeah it's fast!
87 Harley Sportster(couldnt get a 350 to fit)
Self Propelled Lawn Mower
Built in USA!!!!

Virginia Beach, VA.

dropped72shortbed · 03-28-2002, 07:15 PM

i get some sort of missfire or someting under heavy acceleration. not much during deacellration but i have heard it sometimes getting of the freeway as the rpms drop fast.

704x4 · 03-28-2002, 08:17 PM

in a stock set up most people run about 8deg
but i run 10-12deg if i can get by with out any pinging

4deg can make quite a difference in performance

dropped72shortbed · 03-28-2002, 08:42 PM

ok it was at 5 degrees. i bumped it up to 8 to see if there was any difference. under heavy acceleration is started doing that little pop sput noise/hesitation it was doing before except alot more(i guess detonation?) it was doing it a little bit before when it was at 5 so now i turned it down to 4. ill give it a test drive tonight and see if its stopped

704x4 · 03-28-2002, 08:44 PM

it wasn't in storage was it
old gas can cause pinging so can low octane fuel

just a thought

dropped72shortbed · 03-28-2002, 09:01 PM

no i drive it every other day.

gets 92 octane.

704x4 · 03-28-2002, 09:05 PM

thats odd sorry i couldn't help

O'l Buck · 03-29-2002, 02:04 AM

i'm not real sure where mine's at now, it started at 8btdc, then I drove it and it pinged alot, so I retarded it 'till it stopped pinging and still started nice, so, i guess there's your answer, time it till it works good.

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'72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84
ralleys and 31/10.5s

67 Cutlass convertible
330, 3spd stick

90 GMC Jimmy
350/auto
Chad Stephens
Orleans,NE

Andy4639 · 03-29-2002, 02:59 AM

You didn't say if you are running with vacume or not. If you set it you need to plug the vacuum off, and if not running vacuum you need to unplug the pig tail coming out of the distributer, before you set the timing. Set it at 6 to 8 degree's btdc. After you set it then either plug up the vacuum or the pig tail back and then you have the correct timing.

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Andy
71's Are for ever!!! or 67,68,69,70,72 http://geocities.com/chevy71tpi/main.html

dropped72shortbed · 03-29-2002, 03:35 AM

i set it with the vacuum disconnected from the dist. i plugged it up.

it was making a loud poping/sputter noise under full throttle and would hesitate for split second when it did this.

was doing it a very little bit before i started (5 degrees) then i bumped it up to 8 and it did it alot more, so ive moved it down to 4, hopefully thatll stop the noise a little more since it was at 5 before.

03-28-2002, 06:56 PM	#1
dropped72shortbed Registered User Join Date: Nov 2001 Posts: 303	what should the timing be at? i have a 72 c10 w/ 350. i believe its stock internally. just headers and intake, it does have hei. timing is at 5deg BTDC where should it be around? __________________ Blake A. - Huntington Beach CA 72 c10 swb 5/5 drop, 350/350, partialy shaved, soon to be 5/7 on 20s.

03-28-2002, 07:15 PM	#3
dropped72shortbed Registered User Join Date: Nov 2001 Posts: 303	i get some sort of missfire or someting under heavy acceleration. not much during deacellration but i have heard it sometimes getting of the freeway as the rpms drop fast. __________________ Blake A. - Huntington Beach CA 72 c10 swb 5/5 drop, 350/350, partialy shaved, soon to be 5/7 on 20s.

03-28-2002, 08:17 PM	#4
704x4 Registered User Join Date: Feb 2002 Location: Greene, Iowa Posts: 150	in a stock set up most people run about 8deg but i run 10-12deg if i can get by with out any pinging 4deg can make quite a difference in performance __________________ 70 3/4 ton 4x4 FOR SALE Greene, IA

03-28-2002, 08:42 PM	#5
dropped72shortbed Registered User Join Date: Nov 2001 Posts: 303	ok it was at 5 degrees. i bumped it up to 8 to see if there was any difference. under heavy acceleration is started doing that little pop sput noise/hesitation it was doing before except alot more(i guess detonation?) it was doing it a little bit before when it was at 5 so now i turned it down to 4. ill give it a test drive tonight and see if its stopped __________________ Blake A. - Huntington Beach CA 72 c10 swb 5/5 drop, 350/350, partialy shaved, soon to be 5/7 on 20s.

03-28-2002, 08:44 PM	#6
704x4 Registered User Join Date: Feb 2002 Location: Greene, Iowa Posts: 150	it wasn't in storage was it old gas can cause pinging so can low octane fuel just a thought __________________ 70 3/4 ton 4x4 FOR SALE Greene, IA

03-28-2002, 07:09 PM	#2
Randy70C-10 Account Suspended Join Date: Mar 2001 Location: Virginia Beach, Va. U.S.A. Posts: 15,320	That's probably pretty close. If you don't get detonation during acceleration, or backfire during decceleration, I'd leave it alone. ------------------ Yeah, that's right. My name is Randy too! WWW.Randysrods.freeservers.com 1970 Chevy C-10 shortstep 30 Ford Model A Coupe 4 inch chop, 350, GMC 671 blower-Hell yeah it's fast! 87 Harley Sportster(couldnt get a 350 to fit) Self Propelled Lawn Mower Built in USA!!!! Virginia Beach, VA.

03-28-2002, 09:01 PM	#7
dropped72shortbed Registered User Join Date: Nov 2001 Posts: 303	no i drive it every other day. gets 92 octane. __________________ Blake A. - Huntington Beach CA 72 c10 swb 5/5 drop, 350/350, partialy shaved, soon to be 5/7 on 20s.

03-28-2002, 09:05 PM	#8
704x4 Registered User Join Date: Feb 2002 Location: Greene, Iowa Posts: 150	thats odd sorry i couldn't help __________________ 70 3/4 ton 4x4 FOR SALE Greene, IA

03-29-2002, 02:04 AM	#9
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	i'm not real sure where mine's at now, it started at 8btdc, then I drove it and it pinged alot, so I retarded it 'till it stopped pinging and still started nice, so, i guess there's your answer, time it till it works good. ------------------ '72 Chevy 1/2T 4x4 shortbox stepside 350/350auto on '84 ralleys and 31/10.5s 67 Cutlass convertible 330, 3spd stick 90 GMC Jimmy 350/auto Chad Stephens Orleans,NE __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

03-29-2002, 02:59 AM	#10
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,943	You didn't say if you are running with vacume or not. If you set it you need to plug the vacuum off, and if not running vacuum you need to unplug the pig tail coming out of the distributer, before you set the timing. Set it at 6 to 8 degree's btdc. After you set it then either plug up the vacuum or the pig tail back and then you have the correct timing. ------------------ Andy 71's Are for ever!!! or 67,68,69,70,72 http://geocities.com/chevy71tpi/main.html __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

03-29-2002, 03:35 AM	#11
dropped72shortbed Registered User Join Date: Nov 2001 Posts: 303	i set it with the vacuum disconnected from the dist. i plugged it up. it was making a loud poping/sputter noise under full throttle and would hesitate for split second when it did this. was doing it a very little bit before i started (5 degrees) then i bumped it up to 8 and it did it alot more, so ive moved it down to 4, hopefully thatll stop the noise a little more since it was at 5 before. __________________ Blake A. - Huntington Beach CA 72 c10 swb 5/5 drop, 350/350, partialy shaved, soon to be 5/7 on 20s.



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