Just curious how everybodies timing is? I was just wondering a few things about ya'all's advance curve What do you set your initial at? Do you run your vacuum advance off of throttle vacuum or manifold vacuum? What distributor are you running? (stock HEI, Summit HEI, Davis Unified, etc...) How much total timing are your running? Where does your advance come in? Where does your advance top out? How much is from vacuum advance, and how much from mechanical? For example. In my 400 SB in my truck now (which is on its last leg, but I don't care because I'm building a roller cam 383 to stick in my new Blazer very soon) I run 10 initial, am hooked to the throttle vacuum, at 1350 RPM my advance curve climbs rapidly to 38 total at 2800 RPM, then slowly climbs to 43 total at 4300 RPMS. After that, it goes nowhere... This is with a stock HEI with components from several different manufacturers. Just in case you're curious, I'd like to see all that advance come in at 2800 and stay there, but with all the dinking around I've done, I can't make it happen. I just want to get an idea of what you guys are doing for timing in your Blazers and trucks strictly for informational purposes. I've been doing some studying on timing (AGAIN!!) Anybody that doesn't know... Answer too. I want to know just how many people are clueless as well as the ones that do know.