Cut off line for Cast and stock internals

Depending on your Compression Ratio..8:1 is ideal, 9:1 is workable, anything over 9.5:1, I do not recommend to FI-Charge for street use...(and I know what a stock 69 340 has)....the cut off is when parts break.

There are too many variables in the parts of YOUR System, that YOU will choose based on cost/durability.

The Fuel System is highly important on Forced Induction Engines....inadequate fuel VOLUME, and FLOW will lead to a grenaded engine in a HURRY.

Power wise cast pistons, and cast crankshafts will withstand over 600hp at the crank...and about the same torque.

Detonation (caused by HIGH INTAKE AIR TEMPATURES, and too low octane fuel) is what kills most engines.