how to tell 350 from 455 in 1970 olds - ClassicOldsmobile.com
ClassicOldsmobile.com  

Go Back   ClassicOldsmobile.com > Repair & Restoration > Technical & Reference > General Questions
Search

General Questions Place to post your questions that don't fit into one of the specific forums below.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old March 11th, 2009, 12:16 PM   #1
Registered User
 
Join Date: Mar 2009
Posts: 8
how to tell 350 from 455 in 1970 olds

how can i tell if the cars got the 350 or the 455?
mahoneybags21 is offline   Reply With Quote
Old March 11th, 2009, 12:24 PM   #2
Registered User
 
Join Date: Mar 2009
Posts: 8
and is the 1970 350 a big block or only the 455 was a big block
mahoneybags21 is offline   Reply With Quote
Old March 11th, 2009, 12:45 PM   #3
Moderator
 
citcapp's Avatar
 
Join Date: Nov 2007
Location: Bothell, WA
Posts: 9,111
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
__________________


Pat

1957 Super 88 with a 455
1948 2dr series 76 with a 455

"Too soon old too late smart"
citcapp is offline   Reply With Quote
Old March 11th, 2009, 01:55 PM   #4
Registered User
 
jensenracing77's Avatar
 
Join Date: Feb 2009
Location: brazil indiana
Posts: 7,572
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.
__________________
62 Jetfire
62 jetfire 4 speed
70 442 W-30
62-63 Cutlass/Jetfire parts wanted
jensenracing77 is online now   Reply With Quote
Old March 11th, 2009, 01:55 PM   #5
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 22,104
Quote:
Originally Posted by citcapp View Post
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
Well, paint and cylinder heads can be changed. The only foolproof (and very easy) way to tell is to look at the block casting number. This is located on the small shelf above the water pump, where the oil fill tube goes into the block. Compare that number to these:

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.
__________________
Joe Padavano

62 F-85 Deluxe wagon (the NV desert car)
62 F-85 Deluxe wagon (the San Jose car)
64 Vista Cruiser
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
joe_padavano is offline   Reply With Quote
Old March 11th, 2009, 01:58 PM   #6
Registered User
 
jensenracing77's Avatar
 
Join Date: Feb 2009
Location: brazil indiana
Posts: 7,572
thanks joe, i forgot the 307. oops
__________________
62 Jetfire
62 jetfire 4 speed
70 442 W-30
62-63 Cutlass/Jetfire parts wanted
jensenracing77 is online now   Reply With Quote
Old March 11th, 2009, 06:22 PM   #7
Registered User
 
Join Date: Mar 2009
Posts: 8
im goin to look at a 1970 delta 88 and the guy says it has the big block engine so the best way is too look at the casting number?
mahoneybags21 is offline   Reply With Quote
Old March 11th, 2009, 06:31 PM   #8
Registered User
 
Join Date: Mar 2009
Posts: 8
or does the vin number tell if the 455 would be in it?
mahoneybags21 is offline   Reply With Quote
Old March 11th, 2009, 06:47 PM   #9
Registered User
 
marcar1993's Avatar
 
Join Date: Apr 2007
Location: CNJ
Posts: 240
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.)
Click the image to open in full size.
__________________


1987 Olds Cutlass- 70 350/t56 6 spd.
1972 Plymouth Satellite Wagon- Grandpa bought it new
2001 Dodge Ram 2500 Cummins 6spd- Daily Driver
marcar1993 is offline   Reply With Quote
Old March 11th, 2009, 06:52 PM   #10
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 22,104
Quote:
Originally Posted by mahoneybags21 View Post
or does the vin number tell if the 455 would be in it?
The engine code was not included in the VIN before the 1972 model year, so no.
__________________
Joe Padavano

62 F-85 Deluxe wagon (the NV desert car)
62 F-85 Deluxe wagon (the San Jose car)
64 Vista Cruiser
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
joe_padavano is offline   Reply With Quote
Old March 11th, 2009, 07:05 PM   #11
Registered User
 
Join Date: Mar 2009
Posts: 8
kk the pic helped alot thanks
mahoneybags21 is offline   Reply With Quote
Old February 28th, 2016, 01:08 PM   #12
Registered User
 
Join Date: Apr 2012
Posts: 56
I have the exact same casting number on my engine. 395558-2. Is there any way to narrow it down any more?
serta1 is offline   Reply With Quote
Old February 28th, 2016, 01:14 PM   #13
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 22,104
Quote:
Originally Posted by serta1 View Post
I have the exact same casting number on my engine. 395558-2. Is there any way to narrow it down any more?
Resurrecting a SEVEN year old thread...

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.
__________________
Joe Padavano

62 F-85 Deluxe wagon (the NV desert car)
62 F-85 Deluxe wagon (the San Jose car)
64 Vista Cruiser
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
joe_padavano is offline   Reply With Quote
Old February 29th, 2016, 06:33 AM   #14
Registered User
 
Join Date: Apr 2012
Posts: 56
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.
serta1 is offline   Reply With Quote
Old February 29th, 2016, 06:37 AM   #15
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 22,104
Quote:
Originally Posted by serta1 View Post
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.
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.
__________________
Joe Padavano

62 F-85 Deluxe wagon (the NV desert car)
62 F-85 Deluxe wagon (the San Jose car)
64 Vista Cruiser
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
joe_padavano is offline   Reply With Quote
Old February 29th, 2016, 07:19 AM   #16
Registered User
 
Join Date: Apr 2012
Posts: 56
Casting Number

I looked on one of the Olds sites. It said that 7A were hardened but of course it could have been incorrect. Thank you for the information.
serta1 is offline   Reply With Quote
Old February 29th, 2016, 07:20 AM   #17
Registered User
 
Join Date: May 2011
Location: Cochrane Alberta Canada
Posts: 2,527
Send a message via MSN to oldsmobiledave Send a message via Yahoo to oldsmobiledave
or

Quote:
Originally Posted by mahoneybags21 View Post
how can i tell if the cars got the 350 or the 455?
Drive the car. If your fillings come loose on acceleration that is a 350. if your fillings pull out of their teeth then you have a 455. Simple.
__________________
1965 442 White 461cid BBO Richmond 5 speed
1970 Cutlass W-31 Green Auto 14.47 @ 99.7mph
1972 442 W-30 Radiant Green M-20 with 3.73s
1972 442 524cid BBO 10.89 @ 122.5mph @ 3800'
1973 442 350 automatic Black on White
1987 442 470cid SBO 11.37 @ 119.4mph @ 3800'
1980 GMC 468cid BBO 14.73 @ 93.1mph @ 6000'

Eighty Oldsmobiles owned since 1989.
oldsmobiledave is offline   Reply With Quote
Old February 29th, 2016, 07:24 AM   #18
Old(s) Fart
 
joe_padavano's Avatar
 
Join Date: Mar 2007
Location: Northern VA
Posts: 22,104
Quote:
Originally Posted by serta1 View Post
I looked on one of the Olds sites. It said that 7A were hardened but of course it could have been incorrect. Thank you for the information.
FYI, starting with the 1971 model year, every Olds engine was required by federal law to be compatible with then-new low-lead gasoline (and shortly thereafter, no-lead). That required hardened seats and lowered CR. Keep in mind that the hardened seats on factory Olds heads are simply an induction hardening of the cast iron that only goes a few thousandths of an inch deep. These heads did not use press-in seats.

There's a lot of incorrect info on-line. Those of us who were alive then remember it clearly.
__________________
Joe Padavano

62 F-85 Deluxe wagon (the NV desert car)
62 F-85 Deluxe wagon (the San Jose car)
64 Vista Cruiser
64 Jetstar 88 Conv
66 442 L-69 Conv
68 W-30
69 H/O
69 442
70 W-30
72 442
84 Custom Cruiser
86 Caprice wagon (w/307 Olds)
joe_padavano is offline   Reply With Quote
Old February 29th, 2016, 07:37 AM   #19
Oldsdruid
 
Join Date: Dec 2007
Location: Southside Vajenya
Posts: 5,931
Quote:
Originally Posted by oldsmobiledave View Post
Drive the car. If your fillings come loose on acceleration that is a 350. if your fillings pull out of their teeth then you have a 455. Simple.
Oh lord. That puts it as succinctly as I've ever heard it!
__________________
"I don't know what the world may need but a V8 engine's a good start for me"
Cracker "Teen Angst", 1992
rocketraider is offline   Reply With Quote
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Can someone tell me roughly how much HP this 455 will put out? pfergy600 General Discussion 6 June 15th, 2014 03:20 PM
How do I tell the difference 350 vs 400 70vert455 Transmission 6 June 25th, 2012 06:22 PM
Can you tell if 70 455 conv is rare? rmac1970 The Newbie Forum 4 April 17th, 2012 06:31 PM
350 rebuild tell me what you guys think! 73olds350r Small Blocks 15 July 25th, 2011 07:49 PM
How to tell if my 350 was originally a 4bbl? Huron Small Blocks 5 July 10th, 2007 08:35 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -7. The time now is 02:13 PM.


All content Copyright © 2008 by Internet Brands, Inc.