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-   -   chevy 350 backfire (https://www.lateral-g.net/forums/showthread.php?t=33065)

Twix27 08-02-2011 08:07 PM
chevy 350 backfire
 
I just bought a 70 c10 and i've been trying to fix the backfiring problem. When i'm in drive it doesn't backfire but when i'm in low2 or low1 and i let off of the gas it backfires VERY bad sounds like a gunshot and its a bit embarrassing. Thanks for the help

70rs 08-03-2011 09:15 AM
Quote:
Originally Posted by Twix27 (Post 363472)
I just bought a 70 c10 and i've been trying to fix the backfiring problem. When i'm in drive it doesn't backfire but when i'm in low2 or low1 and i let off of the gas it backfires VERY bad sounds like a gunshot and its a bit embarrassing. Thanks for the help
Is the backfire through the carb or exhaust?

Twix27 08-03-2011 06:01 PM
the exhaust

70rs 08-03-2011 07:00 PM
My guess is a timing issue. Without knowing what cam or other stuff you have I wouldn't know where to start as a baseline. Maybe one of the guys here whos better at that could chime in?

Twix27 08-04-2011 10:08 AM
its just a stock 350 with a 4 barrel holley stock heads, stock cam, everything is stock but headers

MarkM66 08-04-2011 02:11 PM
What do you have the timing set at?

Twix27 08-05-2011 03:18 PM
its at about 750 to 800

70rs 08-05-2011 06:32 PM
Quote:
Originally Posted by Twix27 (Post 363997)
its at about 750 to 800
That is the idle RPM. Do you have a timing light?

Twix27 08-06-2011 11:06 PM
no i do not i can go rent one though what would you recommend the timing at

MarkM66 08-07-2011 04:20 AM
Quote:
Originally Posted by Twix27 (Post 364142)
no i do not i can go rent one though what would you recommend the timing at
10* btdc would be a good start.


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