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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,333 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Dec 2006 Posts: 1,154 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,154 | YEP....we went through a whole bunch of scenarios even with our Langdons HEI we found that just timing to the BB was best and it was at this point our vacuum was almost at its highest. Learning both timing methods was of great value to us. The factory specs are for timing at the BB. Never tried to time after the BB (ATDC) yet another scenario I guess. Steve | | |
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