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Click on image for the lowdown. 
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| | | Forums66 Topics128,109 Posts1,056,261 Members48,439 | | 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: Nov 2010 Posts: 21 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2010 Posts: 21 | I inherited a 250 six in my '55-2 GMC and have added a Holley 390 and headers...I am using ported vac. for the stock dist. it seems to run better than manf. vac....What total advance should I shoot for ?
Bear | | |
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