The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-22-2011, 06:41 PM   #1
JQ-72
Senior Member
 
JQ-72's Avatar
 
Join Date: Feb 2001
Location: Killen, Alabama USA
Posts: 2,043
Big Block on VIN plate - can you tell?

Do the GVW numbers decipher whether a SWB truck had a big block or not?

JQ
__________________
Lifetime member - Factory Stock Club!!!
72 Cheyenne Super swb. 402/400,tach,posi,AM/FM, A/C, cruise, 8-track
72 Suburban. 350/350 tilt,tach,AM/FM, F&R A/C.
72 K-5 Blazer - Highlander. 350/350 ps,pb,a/c,tilt, posi.
68 50th Anniversary swb.
66 Custom Cab swb. Factory 327/glide,ps,pb,a/c
60 GMC Custom Cab swb. V6,Overdrive, ps.
JQ-72 is offline   Reply With Quote
Old 06-22-2011, 07:20 PM   #2
DANTIP
Registered User
 
DANTIP's Avatar
 
Join Date: Sep 2001
Location: Fort Wayne, Indiana, USA
Posts: 1,394
Re: Big Block on VIN plate - can you tell?

In 1972, All domestic 1/2 ton Big Block trucks were required to have both heavy front and rear springs. This requirement enables us to determine if the truck was originally equipped with heavy front and rear springs by viewing the weights on the Gross Weight/VIN plate. If the truck was originally equipped with heavy front and rear springs, The "As-Manufactured" (left-hand figures) Gross Weight for this Vehicle Must be 5400 pounds, the Maximum Front End Ground Weight must be 3100 and The Maximum Rear End Weight at Ground must be either 3220 or 3500. Remember, not all trucks with these Gross Vehicle Weights were Big-Blocks, but all Big-Blocks have these Gross Weights. AGAIN, THIS IS ONLY FOR 1972 1/2 Ton Trucks!!! See examples.

I also look for original rivets on the VIN plate, frame # matching, exhaust brackets, etc.
Attached Images
   

Last edited by DANTIP; 06-22-2011 at 07:30 PM.
DANTIP is offline   Reply With Quote
Old 06-22-2011, 09:22 PM   #3
71blksuper4x4
SWB 4x4 Collector
 
71blksuper4x4's Avatar
 
Join Date: Jun 2001
Location: Osage City, KS
Posts: 4,012
Re: Big Block on VIN plate - can you tell?

Nice Tip Dan. Trevor
__________________
TREVOR
1970 CST swb 4x4 (speedwarning,cruise,tilt,tach,8track, original red shoulder belts,tow hooks)
1972 Jimmy (soon to be Hickey cloned)
1971 Cheyenne Super 4x4 swb (tilt,tach,buckets, original blue shoulder belts,am/fm,cruise,tow hooks, dealer 8 track)
1972 Cheyenne Super K20 4x4 Custom Camper (tilt, tach, am/fm, tow hooks, bed toolbox, aux gas tank
1972 Cheyenne Super Crew Cab K30 4x4 Duramax, Allison, np205, buckets, tow hooks (CURRENT PROJECT)
http://67-72chevytrucks.com/vboard/s...d.php?t=624819
1987 Silverado K30 (454,sm465,np205,tach)
1970 Chevelle SS (LS5 454,th400,8track,buckets,tach)
:2004 Jeep Wrangler Rubicon (daily driver)

WTB: 1968-70 Cruise Control Lever
71blksuper4x4 is offline   Reply With Quote
Old 06-22-2011, 09:43 PM   #4
sameyrasmea72
Senior Member
 
sameyrasmea72's Avatar
 
Join Date: Aug 2003
Location: Lubbock, Texas
Posts: 2,379
Re: Big Block on VIN plate - can you tell?

So in 1972 at least, the vin will tell you if was a BB, but the vin will not tell you if it was a SWB?+

I SEE IT WONT TELL YOU IF IT WAS A BB, RATHER IF IT DOES NOT HAVE THOSE WEIGHTS IT WAS NOT A BB.
__________________
72 Cheyenne Super
80 Silverado Blazer 2wd

Last edited by sameyrasmea72; 06-22-2011 at 09:47 PM.
sameyrasmea72 is offline   Reply With Quote
Old 06-22-2011, 09:50 PM   #5
too much stuff
Senior Member
 
too much stuff's Avatar
 
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 9,228
Re: Big Block on VIN plate - can you tell?

Some good info here!
__________________
67 swb CST
68 gmc lwb
69 swb 4x4 project
70 4x4/BB/bkts/posi/tach
70 swb (wifes)
70 blazer 4x4
71 blazer 2x4
71 cheyenne 4x4/tach/posi/ plow rig
72 cheyenne30 motor home
65 fury conv. 383/auto
65 chrysler 300 "L" 413 auto
too much stuff is offline   Reply With Quote
Old 06-23-2011, 12:16 AM   #6
Dave
DND Trucks
 
Join Date: Dec 1999
Location: NW Indiana
Posts: 1,084
Re: Big Block on VIN plate - can you tell?

The SPID will have the VIN #, wheel base and the model # info. As mentioned previously by Dan, you look at all these areas to authenticate the truck.
Dave is offline   Reply With Quote
Old 06-23-2011, 10:06 AM   #7
DANTIP
Registered User
 
DANTIP's Avatar
 
Join Date: Sep 2001
Location: Fort Wayne, Indiana, USA
Posts: 1,394
Re: Big Block on VIN plate - can you tell?

Here is the order I look at when determining the originality of an alleged '72 SWB BB truck.

1) VIN plate/Correct Gross Weights/Original Rivets?
2) Original SPID/Matches VIN Plate?
3) Frame Partial VIN match?
4) Frame Rail Part Numbers Correct for SWB?
5) Correctly Located/attached dual-exhaust brackets?

If any of these are not correct, I personally wouldn't be interested. Many other people don't sweat the originality details, but I will definitely pay significantly more for a correct/original SWB BB truck.

The other unique Big-Block items can be found and installed to look 100% correct and original. I feel pretty confident I could not be fooled by "put-together" truck.
DANTIP is offline   Reply With Quote
Old 06-23-2011, 11:03 AM   #8
too much stuff
Senior Member
 
too much stuff's Avatar
 
Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 9,228
Re: Big Block on VIN plate - can you tell?

Did all big block trucks have dual exhaust?
__________________
67 swb CST
68 gmc lwb
69 swb 4x4 project
70 4x4/BB/bkts/posi/tach
70 swb (wifes)
70 blazer 4x4
71 blazer 2x4
71 cheyenne 4x4/tach/posi/ plow rig
72 cheyenne30 motor home
65 fury conv. 383/auto
65 chrysler 300 "L" 413 auto
too much stuff is offline   Reply With Quote
Old 06-23-2011, 11:36 AM   #9
Dave
DND Trucks
 
Join Date: Dec 1999
Location: NW Indiana
Posts: 1,084
Re: Big Block on VIN plate - can you tell?

Every "factory" big block truck I parted out or owned had dual exhaust hangers.
Dave is offline   Reply With Quote
Old 06-23-2011, 01:49 PM   #10
68 TT
Still plays with trucks
 
68 TT's Avatar
 
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,326
Re: Big Block on VIN plate - can you tell?

Quote:
Originally Posted by Dave View Post
Every "factory" big block truck I parted out or owned had dual exhaust hangers.
I too have never seen a factory big block truck or car with single exhaust.
__________________
67 C10 Suburban The Ant Farm http://67-72chevytrucks.com/vboard/s...82#post6095882
69 C10 shortbed stepside project 45 ACP http://67-72chevytrucks.com/vboard/s...13#post4899613
69 K20 lwb TBI 400 4L60E NP208 square body chassis http://67-72chevytrucks.com/vboard/s...=1#post3955165
68 Camaro SS / RS 500hp 439 inch big block T-400 http://67-72chevytrucks.com/vboard/s...d.php?t=528952
79 Malibu TPI 350 4L60 3.73 gears
68 TT is offline   Reply With Quote
Old 12-19-2013, 04:21 PM   #11
yote1234
Factory 402 Club Member
 
yote1234's Avatar
 
Join Date: Feb 2003
Location: arizona
Posts: 2,906
Re: Big Block on VIN plate - can you tell?

anyone know if the weight ratings in 1971 big block trucks were different?
__________________
1971 Cheyenne swb 402
1968 camaro 327
1965 chevelle malibu 283
1968 honda minitrail z50a #377
1966 uh1-d huey bell 204
yote1234 is offline   Reply With Quote
Old 12-19-2013, 04:30 PM   #12
DANTIP
Registered User
 
DANTIP's Avatar
 
Join Date: Sep 2001
Location: Fort Wayne, Indiana, USA
Posts: 1,394
Re: Big Block on VIN plate - can you tell?

The 72 1/2 ton Big-block trucks were required to have heavy front and rear springs. The 71 and earlier were not.

Dan
DANTIP is offline   Reply With Quote
Old 12-19-2013, 04:57 PM   #13
yote1234
Factory 402 Club Member
 
yote1234's Avatar
 
Join Date: Feb 2003
Location: arizona
Posts: 2,906
Re: Big Block on VIN plate - can you tell?

Quote:
Originally Posted by DANTIP View Post
The 72 1/2 ton Big-block trucks were required to have heavy front and rear springs. The 71 and earlier were not.

Dan
ahhhh. ok thx for reply! dave
__________________
1971 Cheyenne swb 402
1968 camaro 327
1965 chevelle malibu 283
1968 honda minitrail z50a #377
1966 uh1-d huey bell 204
yote1234 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 08:52 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com