Any cracks in the metal or a worn band between the hub and ring are signs that you need to replace the damper. We lubed other metal-on-metal sliding surfaces pistons, rings, and cylinder walls with 20W-50 oil. This step is required for accurate torque readings when you're reassembling the motor. A visual inspection and leak down of the motor indicated that it had been run hot sometime in its long life. However, the state of the engine and its components is what base your costs. If these pathways exist, the block and head can be resurfaced to eliminate the groove.
The Rebirth While the block baked in the hot tank, Howard Allen polished the stock steel crank journals to create a pristine surface finish, checking them with a mic to ensure proper bearing clearances. You will need to perform an oil pump test to check whether you need a new oil pump or not; you do this by filling the oil pan with synthetic lubricant and spin the driveshaft using a standard electric drill. Keeping costs down meant skipping the more expensive roller cam and sticking with a hydraulic, flat-tappet version. What if we further sweetened the deal with a serious weight reduction for the big-block with the addition of some aluminum cylinder heads? Give the entire casting a once over and look for visible defects, which include worn valve guides, damaged threads, deterioration around the coolant passages, chunks of material missing, or cracks in any part of the casting. If the pickup is mangled in any way, replace it. Now, you might say that rebuilding a 350 engine to produce 400hp is easy, well you would be right.
This sleeve would need to be machined out and replaced. How to Rebuild the Big-Block Chevy covers the best techniques for rebuilding classic Chevy big-blocks with more than 450 color photos and step-by-step instruction. Lubricate each lobe of the camshaft and install the camshaft into the engine through the opening in the engine's front. After all, the performance, reliability, and longevity of your Chevy bigblock depend on it. We didn't cc the chambers to check how this changed compression, but the change in compression should be minimal.
To save yourself some money, choose an engine with a solid core. Step 11: Check the Crankshaft Precision Measurement A few quick checks indicate the condition of your crankshaft. What the small ports bring to the table is improved part-throttle response and torque production. Use that crusty 3310 if you want to. If your engine suffered from a head gasket failure or if you suspect it, there are some tell-tale signs to look for. What if we told you there was a magical land where big-blocks and small-blocks were available for the exact same price? Subjects covered include the history of the big-block Chevy, preparation and tool requirements, engine removal and teardown, first inspection, parts, machine work and clean-up, final engine assembly, and start-up.
Written by Tony Huntimer and Posted with Permission of CarTechBooks. This book is essential for not only enthusiasts looking to rebuild their big-block Chevy, but as a guideline for building performance applications as well. Rebuilding a 454 is easy, provided that you know your way around an engine. If you want to undertake a 396 Chevy rebuild, or a Chevy 400 rebuild, if you have a 427 Chevrolet big block engine, or if you need 427 big block specs, this 160-page manual is what you need. Also, make sure you get the motor mounts and starter and try to get all the accessories too. The face of the piston should be free of holes, gouges, and marks that look like pools of molten aluminum.
Once the 454 was buttoned up in our '69, we used a homemade oil primer to spin the pump until oil flowed from each rocker arm. Any of the large oval-port castings from '65 to '70 will have small, 98-101cc chambers to achieve approximately 9:1 compression with smog-era 454 pistons, and these heads are still quite plentiful and cheap. Hendrix resized the toughened rods until the Sunnen bore gauge couldn't discern any out- of-round on their big ends. According to Demon Engines, the short-block can stomach power levels above 700 hp and 7,000 rpm and heavy doses of nitrous. Most scrap engines that are worth their weight in dollars are still found n the vehicle, so you will need to come prepared to remove that engine from the chassis. Truth be told, the motor actually displaces 461 ci thanks to a 0.
Torque production from the low-bucker exceeded 500 lb-ft from 2,800 rpm to 4,600 rpm-that should annihilate some asphalt. Cylinder block and bottom-end reconditioning? If its power you want, then go find a Q-jet, you will need this model to reach the 400hp mark. Naturally, the lack of forged components worried us, especially the pistons, but we had full confidence in the stock crank at our intended power level. What intrigued us about the Demon engine was that it came nearly complete, from intake to oil pan, minus only the carburetor. Inspect the parts and follow the clues they leave in order to approach repairing the engine or rebuilding it.
Step 15: Harmonic Damper Repair The seal in the timing cover can wear a groove in the harmonic damper. Carefully inspect your lifter bores with a light and your finger to make sure the surfaces are free of burs and grooves. After the minor tuning session, we were rewarded with peak power numbers of 736 hp and 691 lb-ft of torque. After this, the rat was run in anger to the tune of 565hp and 532 lb-ft of torque. If you find visual damage on your parts before going to the machine shop, you can save yourself some money by not paying them to do the same thing. Due to our budget, new pistons were definitely out of the question, but we elected to install a cheap set of rings after a quick hone to break the glaze. Finding your Engine and Parts The first thing you need to do is find a good engine to base your work.
The oil pump pickup has a screen on the underside and it should be in good shape. Use an oil pan gasket between the oil pan and the block before torquing the oil pan securely to the engine. This includes all the necessary appendages such as the air cleaner assembly, the oil pan, the fan and the flex plate. It covers troubleshooting, parts reconditioning, and engine assembly, and tells you how to do a complete overhaul or a simple parts swap. So here goes: Cylinder Heads It is cheaper to buy new cylinder heads than to machine the old ones, the time taken to machine old heads can be costly, and they will not produce the power you seek. Track Proven Halfway through this story, your author relocated to Detroit, where there lies one giant obstacle to street machining: winter.