Balancing

• The 383 stroker engines use cranks from the larger 400-cubic-inch engines to increase the travel of the pistons in the cylinders. More piston travel means more cubic inches. When engine builders first created the 400-cubic-inch engine, there was no way to balance the engine internally because there wasn't enough room. Weights added to the flywheel and harmonic balancer ends of the crankshaft balanced out the engines to reduce vibration. External weight adds some twist to the crank at high revolutions per minute (RPM). New metals and manufacturing methods allow crank makers to add weight to the crank itself, making external weight unnecessary. Consider using an internally balanced crank for increased durability.
  
  

Internal Clearance and Compression

• To maximize compression, the pistons must come as close to the cylinder heads as possible without touching. The large crank size that makes high compression possible often will not clear other engine parts in the block. Anytime one part doesn't clear another, engine failure occurs.To know what parts will not clear, engine builders pit the engine together and turn it manually. As the crank rotates they take note of any part that hits against another. Piston rods often need material removed to clear the block. Be sure all parts have ample clearance before firing the engine.
  
  

Rotating Assembly Packages

• If you have the money and don't want to spend so much time balancing and checking clearances, invest in a rotating assembly package. These kits include the crank, pistons, rods, rings and all hardware needed to convert a 350 to a 383. High-end kits come with more durable parts, are balanced and made to clear the inside of the block. You will save time and trouble buying a rotating assembly package.
  
  

Other Tips

• With a high-performance engine, even the little things count. Install some performance parts to maximize horsepower. Air filters like those made by K&N increase air flow into the engine, adding horsepower and helping fuel to burn more completely during combustion. Cold-air intakes increase air flow and take in cooler air to aid combustion. Install performance plugs and plug wires to ensure a good spark during combustion. When you fuel up, use the highest octane rating available and only use high-grade synthetic motor oil.