Unfortunately, if the mains are shot you probably need to have the crank turned. Just replacing the mains will not really solve any problems.
This is the block casting #. 1962 - 1967 Chevy 327 , 275-375 HP, 2 bolt , 2.3" mains. Used in everything from a 64 Vette or various passenger car/trucks
Are you referring to the main caps? If you are some had two bolt mains, and some had four bolt mains.
YES.
65 FT. LBS.
There is no such thing as outer main bearings. The main bearings go inside of the main caps that hold the crankshaft in the bottom of the engine. To get to the mains you will have to remove the oil pan.
hard to say. you can get the block number and check it. it may tell you if its 4 bolt. chances are its not though. aside from that you would have to remove the oil pan to tell.
This casting code is from both two and three freeze-plug small-block 400's from '1970 to 1973. These blocks can also have 2 or 4 bolt mains
There is no such thing as a small block or big block Pontiac. Outside dimensions are all the same from the 326 all the way up to the 455. The only real difference in the blocks is the size of the mains. The 326-400 run a 3" main...while the 421-455 run a 3.25" main. If you are "comparing" it to say a small and big block Chevy.....dimensionally it falls in the middle.
Mains: 2.45" Rods: 2.10"
No. Most of them were 2-bolt mains. The 3/4 and 1 ton 350 engines were 4-bolt main engines. All the 1/2 tons had the 2-bolt main block.
It was used in 1986 and up, some of them are 2- bolt mains and 4-bolt mains. They were NOTHING special. It does have a 1-piece rear main seal.