![]() ![]() ![]() At WOT there's going to be zero manifold vacuum so the vacuum advance will be out of the picture anyway. What you're setting this way is the optimum total advance for when the engine is operating at WOT (wide open throttle) - full power. ![]() Seems that way doesn't it? But no, you want the vacuum disconnected. Once you've got the motor "happy" by setting total advance, then you can check it at idle and see what the initial value is (vacuum disconnected) for reference - so the next time you need to set timing you can do it at idle "the easy way". I don't have any first hand experience (yet) with them or "usual" numbers though. I've heard that aluminum heads can like more advance too, because they run cooler and that too has an effect. One exception is 67's with closed chamber 670 heads - they often like "more" because their combustion efficiency isn't as good so you have to start the fire earlier to get the best out of them. If you don't have a way to accurately and objectively measure performance, then D-port Pontiac's "usually" like to be somewhere close to 36 degrees or so total at WOT with the advance "all in". To check total advance (for performance purposes) disconnect and PLUG any vacuum advance connections, increase RPM while watching the light unitl you're SURE that all the centrifugal advance in the distributor is "in" (the timing marks have quit "moving") - usually somewhere in the vicinity of 3000-3500 rpm. You can check total advance with a light like this one:Īctron/Digital advance timing light with LED screen and mode indicator lights (CP7529) | Timing Light | or something similar. The 'seal of your pants' will lie to you. "Not liking it" is defined as either 1) performance quits improving and starts to fall off or 2) you get into detonation.įinding that point implies you've got a way to check total advance and also a reliable, obhective way to measure performance - something like an engine dyno, chassis dyno, or accurate set of e.t. Generally speaking though, for D-port heads, I'd go through a "trial and error" process starting at about 34 degrees TOTAL, then creeping up from there on degree at a time until you find the point where the motor quits liking it. A great deal depends on your heads, chambers, and overall combustion efficiency of YOUR engine. These pages are continuously updated as new information is posted on the mailing list or forums.To get timing set to the absolute optimum for your car, it's an individual thing. Special thanks needs to be given to all the Firebird-L owners that took the time to respond to other subscribers questions. Answers from estimated value of your car, where to buy a certain part, to how do you convert drum brakes to disk brakes. (More Information) First Generation Firebird FAQsįind answers to Frequently Asked Questions for First Generation Firebirds that have been asked on First Generation Firebird-L or our forums. These suggestions came from Pontiac Historic Services and an information packet I picked up over the years. Some things you might want to do before you put your Firebird in winter storage. (More Information) Car Storage Information (More Information) Paint and Trim Samplesįind on the Body Tag Information page paint and trim samples with matching codes from the body tag. Use the information in this section along with a Billing History Card to verify the options and accessories that were originally equiped on your Firebird. Original 1969 documentation listing all options and accessories that were available on the Pontiac Firebird was used to create this comprehensive list. (More Information) Accessories for your 1969 Pontiac Wide-Track The types of information include body dimensions, bore and stroke, firing order, rocker ratio, valve system timing, ignition system breaker gap for the 1969 Pontiac Firebird. (More Information) AMA Specificationsįind techniqual information via this link. (Body Tag Information) Drivetrain ID Number Informationįind engine, transmission, axle, carburetor, distributor, and head casting identification codes and information in this section. This tag is found riveted to the firewall near the master cylinder on the 1969-69 models. The body tag gives information about the model, body style, paint color, interior color, and date of manufacturer. The 1969-71 models have a plate visible through the windshield on the driver’s side dash panel. The 1969 model’s Vehicle Identification Number is located on a stainless steel plate riveted to the left door jamb on the hinge post facing. ![]()
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