how to tell 350 from 455 in 1970 olds
#3
Here's a couple of ways (others will chime in with more)
Big Block 425 and 455
425 painted red ,455 painted blue, 350 painted gold
letter designation above the number one cylinder A or B or C or D or E or F or G or Ga etc.
number designation above the number one cylinder 5 or 7 etc
Thats for starters
Big Block 425 and 455
425 painted red ,455 painted blue, 350 painted gold
letter designation above the number one cylinder A or B or C or D or E or F or G or Ga etc.
number designation above the number one cylinder 5 or 7 etc
Thats for starters
#4
the 350 is a small block. the fastest way to tell a small from a big is to measure the intake manifold. the big block is 14 inches wide and the small block is 12 inches wide. small blocks are 260 330 350 and 403. the big block is 400 425 and 455.
#5
Here's a couple of ways (others will chime in with more)
Big Block 425 and 455
425 painted red ,455 painted blue, 350 painted gold
letter designation above the number one cylinder A or B or C or D or E or F or G or Ga etc.
number designation above the number one cylinder 5 or 7 etc
Thats for starters
Big Block 425 and 455
425 painted red ,455 painted blue, 350 painted gold
letter designation above the number one cylinder A or B or C or D or E or F or G or Ga etc.
number designation above the number one cylinder 5 or 7 etc
Thats for starters
http://www.oldsmobilewiki.com/index.php/Category:Blocks
Also be aware that conventional terminology with Olds motors uses small block to refer to the short deck motors and big block to refer to the tall deck motors. Small blocks came in 260, 307, 330, 350, and 403 cu in displacements (including 260 and 350 diesel motors). The big blocks came in 400 (long and short stroke), 425, and 455 cu in displacements.
#9
Look next to the oil fill tube, if the # is "396021" then it is a 455.
This is where it will be (this is a torn down 68-76 350, location will be the same, also this is the casting # if it's a 350.)
100_3521.jpg
This is where it will be (this is a torn down 68-76 350, location will be the same, also this is the casting # if it's a 350.)
100_3521.jpg
#13
Narrow what down, exactly? That casting is a 350 Olds from 1968-1976. The VIN derivative stamp will tell you the model year of the block. The head casting numbers will tell you the year of the heads. More than that requires disassembly to check specific parts.
#14
Casting
Sorry I did not check the date of the postings. I just did a search on the site. The heads have a large number 7 on them by number one plug. I believe that means 70 or 71. Non hardened valves. Thank you for the information.
#15
Not sure where you searched, but No. 7 heads were used in the 1971 model year only and the DO have induction hardened valve seats, as to all Olds heads from the 1971 model year forward.
#17
#18
There's a lot of incorrect info on-line. Those of us who were alive then remember it clearly.
#19
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June 15th, 2014 03:20 PM