4"
No. The bore size is different between a 305 and 350. The 350 bore size is larger.
A 350 engine typically has a standard bore size of 4.000 inches. When it is "bored 30 over," it means the bore has been increased by 0.030 inches. Therefore, the bore size of a 350 bored 30 over is 4.030 inches.
4"
4.030"
Primarily the bore size. The 305 has a bore of 3.74 and the 350 is a 4.0 bore. They share the same stroke on the crank. And no, you can't bore a 305 to a 4.0 bore.
78.5 MM
4.00"
355
A typical bore size for a Chevy 350 engine is 4.000 inches. A bore measurement of "sixty over" indicates that the bore has been increased by 0.060 inches, resulting in a final bore size of 4.060 inches. This modification is common in engine rebuilds to increase displacement and improve performance.
NO the bore / cylinder size is different. Pluse the stroke
4.040". The standard bore is 4.00".
The bore and piston size are the only real difference between the two.The 350 has a bigger bore and piston and so puts out more horsepower, the305 = 3.75" bore and the 350 = 4" bore. Both have the same stroke.Also the starters are different because of the smaller flywheel but other wise the external parts are interchangeable.