I got a 305 out of a 83 camaro and was told it was a 350 but I ran the number and its a 305 all i really want to know is whats the difference is because when i looked up a crank on summit they said the crank is for both the 305 and the 350. can anyone help me thanks.

 

Are you asking about the similarities of the canks for a 305 vs 350, or the differences of a 305 vs 350?
I would bet Summit knows what crank goes in a 305 and a 350. If they say it's the same then believe it. They aren't A-Zone or Failvance.
From what Iv'e read the flexplate bolts don't line up, so if you replace the flexplate then the starter from the old flexplate might not work either. I assume because of the number of gear teeth.
The new crank should be balanced with the pistons and rods.

 

are you looking for performance? If so, then go get 45 CID more

 

im trying to figure out what the difference that makes it a 305 from 350 if the bore and stroke is the same the whats the difference? what makes a 305 a 305 and what makes a 350 a 350

 

Simple, the bore sizes are different. The 350 has a 4" bore, 305 has a 3.736" bore. Both have a 3.48" stroke.
And no, you can't bore out your 305 block that much to make it a 350.

 

thanks thats all i needed to know

 

305 is a lighter and weaker block. It is not a good base to start a build with.

 

...Or to end with either!

 

How is it lighter, or weaker besides being a 2 bolt main?

 

Casting dimensions for 305 block internals are thinner then 350. Major reason you cannot bore out a 305 block.