ITS ALMOST ALWAYS A BETTER IDEA to buy a matched balanced kit with all components supplied from a single source It must be checked with the specific piston and rod combination you use.
It just tells you how it's intended to be balanced. The same is true if you buy a crankshaft, connecting rods, and pistons separately.Ĭrankshafts are listed as internal or external balance. If you buy an Unbalanced Rotating Kit, you will need to have it balanced before it's installed. These can be installed without taking the parts to the machine shop. Unless you're racing, it's easiest to balance the engine the same way the factory did.Ĭhevy 305/350 (2-piece rear main seal) InternalĬhevy 350 (1-piece rear main seal, including LT1) Combination of Internal & Externalīalanced Rotating Assemblies come pre-balanced from the manufacturer. You may also need to clearance the block for the larger counterweights. It requires a new crankshaft, harmonic balancer, and/or flywheel or flexplate. However, either type of balance is fine for most engines.Ĭonverting from external to internal balance can be expensive. External counterweights can cause the crankshaft to flex at high rpm. Generally speaking, internal balance is the better option. This involves adding weight to the harmonic balancer and/or the flexplate or flywheel. If the crank's counterweights are too light, the engine must be externally balanced. They will not affect the other rotating parts. External parts like the balancer and flexplate/flywheel have a neutral balance. The Harmonic Balancer and/or the flexplate or flywheel can also be weighted.Īn internally balanced engine has all the counterweight on the crank. This involves adding or removing weight from the crankshaft. Balancing can be internal, external, or a combination of both.īalancing an engine means offsetting the weight of the pistons and rods. It minimizes vibration and maximizes engine life. I was recently asked if the difference between a cast crank and rods at $1200, vs FORGED at $1600 was worth the difference in cost by a guy who fully intends to race the car and has a high probability of using nitrous.Īn engine must be balanced to ensure smooth operation.
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