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Mod | | | Forums66 Topics128,014 Posts1,055,327 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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#58440 03/29/2006 12:41 AM | Joined: Dec 2005 Posts: 36 New Guy | | New Guy Joined: Dec 2005 Posts: 36 | Need to know what the timing is supposed to be set on - for a 1978 250ci engine. It has a one barrel carb. Any help would be appreciated. | | |
#58441 03/29/2006 5:03 AM | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | The 1976 has three different setting 6, 8, 10 depending on trans or ??? Any one of those should be close enough, if it pings set it back a little. The only way to be sure exactly what it is, check the distributor number against the factory shop manual.
Larry
I don't own a vehicle that isn't old enough to drink.
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#58442 03/29/2006 6:30 PM | Joined: May 2005 Posts: 1,624 Shop Shark | | Shop Shark Joined: May 2005 Posts: 1,624 | My 250 hooked to a Turbo 350 is set to 6 BTDC. Runs fine
Six volt guy living in a twelve volt world
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#58443 03/30/2006 1:37 AM | Joined: Dec 2005 Posts: 36 New Guy | | New Guy Joined: Dec 2005 Posts: 36 | Thanks alot for the response. I checked the timing and it appears to be right. My problem is...I can't get any acceleration. New carb.It backfires thru the carb but only when you try to accelerate. Any suggestions? By the way, it has a turbo 400 tranny. | | |
#58444 03/30/2006 4:31 AM | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | Sounds like the vacuum advance is bad. Hook up your timing light again check were the it's timed. Pull the vacuum advance hose off and check the timing again it should of moved by 18-24 degrees. If it hasn't moved you need a vacuum advance diaphragm for your distributor number. Should be 24 degrees for the automatic unless GM changed the vac adv from 76 to 78.
btw You did disconnect the vac hose to the distributor to set the timing and the vac hose does have a vacuum on it?
Larry
I don't own a vehicle that isn't old enough to drink.
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