11-05-2009, 11:37 AM
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#1
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FSC FOR LIFE!
Join Date: Apr 2005
Location: Minnesota
Age: 26
Posts: 3,590
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1979 Chevy Flatbed.
I have a friend who has a timing issue with his 1979 Chevy flatbed.
350 V8, 2bbl, Points HEI ignition, Pretty much stock.
Put all new ignition on it (Distributor, cap, rotor, coil, wires, plugs.
Idles rough, then when you give it gas it backfires out the carb. It did this before he did all the stuff to it. I'm still thinking it's not timed right. Any other ideas of what it could be? I'm not thinking it's a flat cam, or valve train?
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1991 K1500 Silverado RCLB aka "The UFO"
1993 K1500 W/T RCLB aka "The beater"
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11-05-2009, 05:57 PM
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#2
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Loving The 3 Speed
Join Date: May 2007
Location: Portage La Prairie Manitoba
Posts: 845
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Re: 1979 Chevy Flatbed.
What is the timing at? Vac advance disconnected?
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355ci-9.6:1 Compression-TBI mods-Vortec Heads-GMPP TBI Intake-Melling Cam-Roller Rockers-Flowtech Headers-MSD Ignition-Super 40's-TB Spacer-AFPR-6" Superlift-36"TSLs-Built Turbo 350
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11-05-2009, 09:00 PM
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#3
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GMC RULZZ
Join Date: Mar 2005
Location: San Diego
Age: 43
Posts: 9,780
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Re: 1979 Chevy Flatbed.
if timing is erratic at idle, I would suspect internal engine damage or just plain worn out.
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 O2 GMC RCSB 4.8L V8 AUTO 3.73's
rebuilt/beefed up 4L60E(at 43,000miles)
 Matching Ninja 500r
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11-06-2009, 05:45 AM
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#4
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Registered User
Join Date: Oct 2008
Location: plainville, Connecticut
Age: 19
Posts: 125
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Re: 1979 Chevy Flatbed.
one of my trucks did that and i did evething i could think of well it was the hei module under the rotor did that truck ran great try it i think the part is cheap
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11-06-2009, 09:49 AM
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#5
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FSC FOR LIFE!
Join Date: Apr 2005
Location: Minnesota
Age: 26
Posts: 3,590
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Re: 1979 Chevy Flatbed.
Quote:
Originally Posted by NEUMANNZZ
if timing is erratic at idle, I would suspect internal engine damage or just plain worn out.
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I'm thinking it's a flat cam. I mean a 350 in that big of a truck!!! 
__________________
1991 K1500 Silverado RCLB aka "The UFO"
1993 K1500 W/T RCLB aka "The beater"
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11-06-2009, 10:03 AM
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#6
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RAMZ TRK
Join Date: Jan 2009
Location: Lebanon, VA
Age: 35
Posts: 362
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Re: 1979 Chevy Flatbed.
Timing chain got slack. On a big truck like that people use the engine to hold it back instead of brakes. Also check distributor gear and for slack. Does the timing jump around with a timing light on it?
__________________
2004 GMC Seirra ECSB 4X4 5.3 AUTO
Quote:
Originally Posted by someotherguy
It's always easier to ask forgiveness, than ask permission! 
Richard |
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11-06-2009, 10:59 AM
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#7
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Registered User
Join Date: Feb 2008
Location: Overland Park, KS
Posts: 1,591
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Re: 1979 Chevy Flatbed.
Quote:
Originally Posted by PHATSPEED7X
I'm thinking it's a flat cam. I mean a 350 in that big of a truck!!! |
Beef it up, put a new intake with Vortec heads on it and a 4bbl. Get some longtubes and do a full exhaust, let it breathe. With some work a 350 could do well in a truck that size, i'd imagine it's already got granny low gearing and axle ratio.
__________________
95 Sierra C1500
TBI 305, NV3500
10-Bolt 3.42 Open
Custom open air cleaner
Single 3", Thunderbolt cat, 18" d/o Magnaflow, 3.5" tips in front of the rear passenger tire.
New rig (not pictured): 86 Silverado C10 4bbl 350
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11-06-2009, 11:26 AM
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#8
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RAMZ TRK
Join Date: Jan 2009
Location: Lebanon, VA
Age: 35
Posts: 362
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Re: 1979 Chevy Flatbed.
We had a c60 log truck like that with a 350. Loaded you will not break the speed limit but it got the job done. One guy use to haul logs with a inline 6. LOL.
__________________
2004 GMC Seirra ECSB 4X4 5.3 AUTO
Quote:
Originally Posted by someotherguy
It's always easier to ask forgiveness, than ask permission!
Richard |
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11-06-2009, 11:33 AM
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#9
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Registered User
Join Date: Feb 2008
Location: Overland Park, KS
Posts: 1,591
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Re: 1979 Chevy Flatbed.
I'd prefer an inline 6 over a 350 in a truck like that, a built inline 6 with proper gearing will pull like a diesel and last forever. There was an old Ford F-600 for sale near my house, I wanted to buy it and drop a built 300 into it with a 4-speed, it'd be more truck than I need though, right now my stripped minivan hauls everything lol.
__________________
95 Sierra C1500
TBI 305, NV3500
10-Bolt 3.42 Open
Custom open air cleaner
Single 3", Thunderbolt cat, 18" d/o Magnaflow, 3.5" tips in front of the rear passenger tire.
New rig (not pictured): 86 Silverado C10 4bbl 350
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11-07-2009, 11:16 PM
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#10
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FSC FOR LIFE!
Join Date: Apr 2005
Location: Minnesota
Age: 26
Posts: 3,590
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Re: 1979 Chevy Flatbed.
Turns out the guy who installed the wires got two backwards. Now it runs like a top. Still a little underpowered but gets the job done.
__________________
1991 K1500 Silverado RCLB aka "The UFO"
1993 K1500 W/T RCLB aka "The beater"
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