Its a 355 cubic inch
Take off a cylinder head and measure the diameter of the bore.
a bored out 350 blockThat answer is right, but it did not answer your question completely.A 355 is a 350 block that has been bored .030 / thousand oversize from factory stock bore. Nothing special.
Chevy 350 engines are bored to a 4 inch bore.
4.310
Go to a local machine shop that does engine work. They will explain the procedure for boring an engine in detail. This is where you will have to go to get your engine bored.
Typically if the motor has been bored the top of the replacement pistons will have it stamped on top of them. for example if bored 0.30 over this will be on the top of the pistons.
Most builders feel it shouldn't be bored over 4.065".
A Chevy 305 engine bored .040 over would typically be referred to as having a +.040 bore, indicating the increase in bore diameter from the standard size. This modification can increase the engine's displacement and potentially enhance its performance.
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.
4.00"
generally you could remove a head and measure the bore with a micrometer. then read specs on the vehicle and what it's original engines bore was. make sure an engine was not swapped into the original engines place.
a 357 Chevy is a just a smallblock 350 Chevy bored .040 over for a total CID of 357, just as one bored .030 is a 355 Chevy. a standard rebuilt 350 is generally bored out during the rebuild process to usually 355, sometimes 357. right now i have a 357 Chevy in my 1970 chevelle