While some people *might* get away with a very low level of boost (perhaps 3-5 PSI) for a short period, this is extremely risky and not recommended. Even at low boost, the increased stress on the engine could quickly lead to problems like:
* Rod knock: Connecting rods failing due to excessive stress.
* Blown head gasket: Head gasket failing due to increased pressure.
* Cracked block: The engine block cracking due to excessive pressure.
* Premature piston wear: Pistons wearing out much faster than normal.
To run any meaningful amount of boost reliably, a Chevy 305 (or any engine intended for naturally aspirated use) needs extensive internal upgrades, including:
* Forged internals: Stronger pistons, connecting rods, and potentially a crankshaft.
* Head studs: Stronger head fasteners to handle increased cylinder pressure.
* Improved head gasket: A high-performance gasket capable of withstanding higher pressures.
* Proper fuel management: A system capable of delivering the increased fuel required for boosted operation.
* Engine management tuning: Careful tuning to ensure the correct air/fuel mixture and timing.
In short, don't try to boost a stock 305. It's far more cost-effective and safer to build a properly prepared engine for forced induction from the start, or choose a different engine better suited to handling boost.
