Number the rods 1 through 8 and the mains 1 through 5. How to Rebuild a 350 Chevy Engine The Chevy 350 Small Block Engine The Chevrolet small-block engine is a series of V8 engines that were in normal production at the Chevrolet Division of General Motors between the years 1955 and 2003, all models using the same basic engine block. Disable the ignition system and make sure the throttle and choke plates are fully opened. Also, check off the attached accessories and note any damaged or missing components. Plan on spending some extra time on the bearings to make sure the cam turns freely without too much clearance, because anything over 0. If there is still no oil flow, check for blockages in the relevant pat … hways.
This basic information will begin the permanent record of your rebuilding project. The 1956 block was modified to accept an integral, replaceable oil filter. Note: If the crank slot is enlarged or the key is loose, the crank may be unusable more on this in Chapter 3. The heads had bigger valves plus sodium filled valves to get read of the heat in the valves. Then remove the cover bolts and covers. Talk to your machine shop about a good break-in oil.
If you have to pry the covers loose, take your time because excessive force can easily bend them. Do not drive the valve out with a punch. Be sure to wrap the rod with tape to prevent scuffing the crank journal. If your engine has 4- bolt main caps, also remove the six side bolts on the three center caps. I got it in a book store in the research dept. If you anticipate being stopped for more than one minute, shut off the car.
Every year, Engine Builder magazine surveys its readers to ask how much you charge for various rebuilding and machining operations for different engines. Sometimes the lower sprocket will slide off of the crankshaft with little effort; however, it is often firmly attached. Roll each pushrod on a clean, flat surface to make sure none are bent. The lifters are hydraulic and should self-adjust. My phone camera was terrible at the time, so apologies for the lack of clarity and detail in the photos. Also, remove the dipstick and dipstick tube by twisting it back and forth by hand. All orders placed outside of the United States must be paid by Wire Transfer.
Then remove the two starter attaching bolts. Nearly half of the 706 and 862 castings are cracked around the three head bolt bosses in the middle of the head. Without proper safety glasses or aface shield, metal shavings, solvent, or other debris can wind up in your eye. Uniformly worn piston rings give consistently low compression readings, or consistently high leakage readings. If the engine overheats, check for combustion gas in the cooling system. Lock the crankshaft by inserting a pry bar or large screwdriver through one of the flexplate holes or in between the ring gear and starter housing see Step 4. This is why it is a good idea to take photos and notes before disassembly.
Take into account that there are loads of Chevy small block engines out there, and they are even ready to run as-is, so with just a little bit of understanding, you can pick up an entire 350 small block with core for a very reasonable price. Order parts based on your needs and engine knowledge. Step-8: Mount Engine on Stand You cannot build a quality engine if you have to roll it around on your garage floor! Also check the float level, the power valve or power circuit , and make sure the secondaries are not opening too soon. A major exception to this generalization is the unique 400-ci combination introduced in 1970. Chain tension will keep the engine upright.
Wire resistance should measure approximately 1,000 to 10,000 ohms per foot on stocktype wires, and lower on aftermarket sets. Since the appearance of the insulators can help diagnose some engine malfunctions, you may want to number the spark plugs masking tape works well for future reference. To strengthen the long-stroke crank, the main-bearing journal diameter—and the corresponding bearing bore in the block—was increased to 2. Almost any small room with about 150 to 200 square feet of available space can be converted to a small engine assembly shop. Be ready to catch the piston before it drops to the floor.
Industrial solvent commonly available as paint thinner is used to wash many engine components before pre-assembly or final assembly, so a solvent tank is an essential item. If you have any doubts, reinstall the crank bolt—without the washer—and allow the draw bolt to push against the head of the crank bolt. This engine hoist, or cherry picker, can be easily knocked down for storage. When two-thirds of the key is visible, use pliers to pull it free. Also, remove and inspect the spark plugs for correct heat range, proper gap, worn electrodes, excessive contamination, and cracked insulators. Rebuilders often install short rubber hoses over the bolts. The heads are significantly lighter than the original factory heads, and they provided a 250-cfm flow for the intake and a 190-cfm flow at the exhaust.