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Cat extended life coolant premix 50 50 msds and 50 50 mcd of 10.5 percent lead and washer, and the total coolant capacity is 3,0. The washer for coolant is a 3/8th diameter copper washer with a spring loaded O ring to make it water tight. The washer is not shown in this drawing. Figure 8-13 shows a diagram of the pump system. The diagram shows the coolant level as being within the float bowl.
**FIGURE 8-12 The pump for the Cooling System (Courtesy Edelbrock)**
**FIGURE 8-13 A diagram of the Cooling System for a 383-ci engine**
### **Ignition System**
The ignition system consists of a timing cover that is held to the block by the cam followers, a timing chn that connects the camshaft to the distributor, a distributor shaft and the distributor itself. The distributor has 12 posts, each of which has a primary and a secondary windings on it, and a shaft that connects the posts. The primary winding, which is on the posts near the cam followers, is connected to a distributor cap. A voltage is applied to the cap, and it opens and closes a relay coil that opens and closes the primary windings of the posts, which in turn opens and closes the primary winding of the ignition coil. The secondary windings are connected to the distributor cap through a wire harness and then through a distributor cap to a coil, which, in turn, feeds voltage to the spark plugs. The secondary windings connect to the spark plugs by way of a harness that is connected to the distributor.
A distributor is a type of ignition distributor, and a distributor cap is a type of distributor cap. The ignition system is similar for most four-barrel applications and for most eight-barrel applications. If your engine is eight-barrel, there will be two coils connected to the distributor, and if your engine is four-barrel, there will be only one coil connected to the distributor. The ignition system for the 383ci engine is shown in Figure 8-14.
**FIGURE 8-14 The ignition system for the 383ci engine.**
The timing cover is removed by unbolting it from the block using the correct tools. The timing chn is held on the block by a roller chn tensioner and by a retning pin. The distributor shaft and its posts are removed by unbolting them from the block using the correct tools. The distributor is mounted in a cap and rotor assembly, which is held in a slot in the block by the retning pin. After the timing cover, timing chn, distributor, and distributor shaft have been removed, the distributor cap is removed from the distributor cap mounting hole.
The 383ci engine has two valves that open into each cylinder. The intake valves and the exhaust valves, both of which are rocker arm valves, are opened and closed by a pushrod that moves the rocker arm to open or close the valves. The pushrods are connected to the rocker arm by a pushrod arm that holds the pushrods in place. The rocker arm, pushrod arm, and pushrods are all held in place by a rocker arm stud and a rocker arm housing that is bolted to the block.
The camshafts in the 383 engine are driven by the crankshaft and are mounted on the crankshaft via a timing cover that has a shaft hole in it. The camshaft is connected to the crankshaft by the timing chn, which connects the crankshaft and the camshaft via roller chns. The roller chns are held on the camshaft by cam chn tensioner and holding devices.
### **Compression Ratios**
The 383 has a compression ratio of 9.4:1. This means that for every inch the piston travels, the valve stem travels 9.4 inches. The camshaft is mounted on the camshaft sprocket, which is connected to the crankshaft sprocket by a belt.
### **Ignition System**
The 383 has a basic single-point ignition system. The distributor is mounted in the block in the center of the combustion chamber, as shown in Figure 8-15. The timing of the ignition is set by the position of the distributor rotor in the distributor.
**FIGURE 8-15 The 383-ci engine has a central distributor mounted in the center of the engine.**
The spark plugs are connected to the ignition coil by a distributor plug and harness that is attached to the distributor and the coil. The distributor plug holds the spark plugs in place and is attached to the distributor cap by an electrical connection. The spark plugs are located so that they can be removed by removing the distributor cap. The spark plugs are connected to the ignition coil by a distributor plug and harness. The plug has terminal posts with a central wire that is attached to the plugs, and the posts are held in place by the cap that is screwed in place. The plug and terminal posts are then connected to the coil by a distributor plug and harness that is attached to the coil. The distributor plug and harness is held in place by the cap that is screwed into place.
The 383-ci engine has a wiring harness that is located under the hood. The harness is attached to the distributor and to the plug posts by a plastic bushing, as shown in Figure 8-16.
**FIGURE 8-16 The 383-ci wiring harness is attached to the distributor by a bushing.**
## **Chapter 9
A number of people have asked me about the application of the 383 and 427 engines for competition racing. The 383 and 427 engines are well suited for racing applications, and they are excellent choices for engine builders of small displacement big-block engines.
### **Performance Parts and Accessories for Competition Engines**
The most popular performance-parts and accessories for the 383 engine are aftermarket rocker arms. If you