* Connecting Rods: A 327 crank will require longer connecting rods to maintain proper piston-to-wall clearance and avoid piston-to-head interference. The stock 305 rods will be too short. Custom or aftermarket rods specifically designed for this application are necessary.
* Piston Choice: Pistons must be selected to match the longer stroke of the 327 crank and the new connecting rods. The piston's compression height (the distance from the wrist pin center to the top of the piston) will be crucial to achieve the desired compression ratio and avoid interference.
* Clearance: With a longer stroke, there's a higher chance of piston-to-wall clearance issues, as well as potential interference with the block itself or the cylinder heads. Precise machining and careful selection of components are essential.
* Oil Clearance: The longer stroke may affect the oil clearance in the block. This might require oil pump modifications or careful selection of oil to ensure adequate lubrication.
* Cylinder Heads: While the stock 305 heads *might* work, they may not be ideal for the increased displacement. Aftermarket heads optimized for a larger displacement engine are often preferred to maximize power and efficiency.
* Balancing: The rotating assembly (crankshaft, connecting rods, and pistons) must be carefully balanced to avoid vibrations and potential engine damage.
In short, building a 305/327 stroker engine is a significant undertaking that requires expertise and precision. It's not a beginner project. You'll need to consult engine building resources and potentially work with a machine shop to ensure everything is properly done. The resulting engine will have significantly more displacement and power than a stock 305, but only if built correctly.
