How can you tell the difference between a 330 and 350

TURNA

Active member
Oct 5, 2018
189
96
28
NY
heads could be off anything they just bolt on

What is the number on the block?
 

TURNA

Active member
Oct 5, 2018
189
96
28
NY
That should be a 330 do u have the pan off it?

Does it have the steel crank?
 

Olds 307 and 403

Active member
Oct 4, 2018
618
214
43
Melville, Saskatchewan
The 350 came out in 68, so no 66 350. The 68-76 350 casting number is 395558. The only real difference like all SBO is a different bore for each engine size. As in when they enlarged a motor, they increased only the bore size.