The Road Draft Tube survived many years as Chevy's way of eliminating crankcase gases, so most of us don't consider changing anything, but it has its drawbacks. It's dirty, it leaks small amounts of oil on your clean driveway, and it's hard to clean properly. Enter the Positive Crankcase Ventilation system! PCV is really simple. It simply means pulling the unwanted and unclean gases out of your crankcase using the engine's vacuum pressure. This very same system is being used today.
GM Wiring - HEI Hook-up ---HELP!!!
HEI Distributor Troubleshooting With Performance Distributors
The correct adjustment of a vacuum advance unit is critical to ensure that an automobile engine runs at its peak performance. The vacuum advance mechanism allows the distributor to vary the spark timing to compensate for the load and speed requirements of the engine. During light loads on the engine, the cylinders burn leaner and require the spark to be initiated earlier in order to obtain optimum power. The vacuum advance unit provides this varying spark advance and improves the fuel economy and throttle response throughout the operating range of the engine. Set the mechanical timing of the engine.
One Wire Alternator Conversion
The Chevy Corvette, along with the automotive industry as a whole, would experience a significant transformation at the onset of the new model year. Because of serious health issues and environmental contamination associated with the use of lead fuel, it was determined that the automotive industry would — and should — phase it out. While the lead additives allowed engine designers to produce more powerful, higher compression engines, it also produced a dangerous neurotoxin through exhaust emissions, which resulted in many cases of acute, and widespread lead poisoning, especially in children. Additionally, the lead component was destructive to catalytic converters, which were to become a Federally mandated requirement to aid in the control of damaging exhaust emissions. Zora Arkus-Duntov , who had been instrumental in breathing life into the Corvette, retired on January 1, after 21 years and 7 months with General Motors.
Is this a better way to go with a street engine? What kind of timing should I be running and should I disconnect the vacuum advance? First, on a street-driven engine there is no good reason to lock out your ignition timing.