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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,332 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Jan 2010 Posts: 120 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 120 | poke a screwdriver down cyl #1 and check that your timing marks are within a mile. If you have a vacuum gauge, set it for max vacuum at idle. check that your centrifugal bobweights are OK. Was it OK before you fiddled with it? The rotor may be dodgy. HEI units demand better insulation due to higher firepower. If all else fails, retard it and hold the idle slightly high, then rotate the dizzy fowards and find the spot that gives the greatest increase in idle speed for movement of the dizzy. This will be where its passing over TDC. that will get you moving.
A neon timing light or triggered timing light may show erratic or intermittent timing- then something is wrong.
cheers Rich
'47 Canadian RHD 1.5 ton truck
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