His passion for performance got him noticed by many locals, and he began helping them modify their vehicles. On a Chevy V8, the vacuum advance can should be pointing roughly at the passenger side front tire. Another adjustable vacuum advance can for the GM HEI is the Accel p/n 31035 that is said to allow infinite adjustment to both the amount and rate of advance. There are times where the engine requires so much initial timing that the engine can be hard to start without kicking back against the starter. If the battery voltage drops below 10.5 volts while cranking, you probably have a bad battery. In a stock application this wire is often pink and a relatively large gauge. It is located under the distributor cap secured by a pair of screws. Now you can have all of the benefits of EFI and maintain the traditional looks of a carburetor. We'll send you the most interesting Chevy Hardcore articles, news, car features, and videos every week. Many times, a low-voltage issue can cause a myriad of problems. A typical advance curve for an engine built with a mild camshaft and having a compression ratio correctly matched to the cam will look something like this: The above gives 46-48 degrees of advance (including vacuum advance) under light throttle cruse/high vacuum conditions. They also knew that by adding larger coils, there performance was enhanced accordingly. This is located inside the distributor, and has the green and white wires from the pick up attached on one end, and a terminal block on the other. That said, being as how we're only talking about 6 to maybe 8 degrees added vacuum advance, there's a good chance there will be no problems at all from using more vacuum advance. This isn't a good plan for the street, but in some cases it'll be about the only way to get a cam to work on the street. The other end of the brace attaches directly to a threaded boss on the engine block, just below where the block deck and head meet. Check a repair manual/GM service manual for the correct way to set the base timing for your particular engine/year (this usually requires disconnecting a spark control wire before the timing is set to TDC). Use dielectric grease on both sides of the rubber insulator. This page was last modified on 25 August 2016, at 10:53. A performance cam having excessive duration/overlap/tight LSA specs could require more initial and less mechanical advance. Using plug gaps wider than that is unnecessary when using a basically stock HEI ignition. The statement of having about 50 degrees combined advance (initial, mechanical, and vacuum) at cruise rpm needs some clarification. If that isn't possible, another way is to replace the module with a known good module. Most small block Chevy engines like about 32-38 degrees total advance, all in by 3000 RPM or less if the engine and fuel will allow. There will be a selection of shims; use whatever combination needed to get as close to the target as possible. The springs are located directly under the rotor and are easy to remove/replace by hand or with needle-nose pliers or hemostats. The module also controls how much "dwell" the coil receives between firings. But, if the ground from the engine to the battery is making a good connection, ignition spark will be none existent. Failure to do this can lead to an early failure of the module. These recommendations can be considered to be a safe starting point. The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block.Referred to as a "small-block" for its comparative size relative to the physically much larger Chevrolet big-block engines, The small block family spanned from 262 cu in (4.3 L) to 400 cu in … What happens sometimes is the initial timing is too low, causing the primary butterflies to be opened so far to get the engine to idle that the engine is not running on the idle circuit; instead it is running mostly on the transition slots.
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