way to tell if a factory big block truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

DADS71 · 06-13-2009, 06:54 AM

I have a 72 super short bed ,the rumor is it was a factory big block truck but now has a 350 installed what is the best way to tell if it was a factory big block truck?

**'68OrangeSunshine** · 06-13-2009, 06:56 AM

There should be some mention of it on the SPID inside the glovebox door.

**special-K** · 06-13-2009, 07:30 AM

Look for a factory exhaust bracket for dual exhaust.I`m assuming there`s no SPID.

LONGHAIR · 06-13-2009, 07:47 AM

The SPID inside the glove box door will show an engine option. The big block was not standard, so it will be listed there as a 400.

**too much stuff** · 06-13-2009, 08:21 AM

Probably would have a high hump trans cover unless it is a 3 speed manual. Should have a heat shield on the bottom of the pass floor. A couple of places to start...

71 super · 06-14-2009, 12:09 AM

Heat shield is a good place to start for sure- the bolts that hold it in place are 5/16 phillips head bolts, if things are changed usually this gets over looked. The dual exhaust hangers are another good thing to look for and the correct motor mounts should be a clam shell type if a true 72 bb truck. The fan shroud was prob. not changed out either so it will be visably different from a small block truck.

JimKshortstep4x4 · 06-14-2009, 04:52 AM

The left fender will have mounting holes for the power steering reservoir if the truck came with power steering.

Jim

06-13-2009, 06:54 AM	#1
DADS71 Registered User Join Date: Jan 2009 Location: EVANSVILLE INDIANA Posts: 54	way to tell if a factory big block truck I have a 72 super short bed ,the rumor is it was a factory big block truck but now has a 350 installed what is the best way to tell if it was a factory big block truck?

06-13-2009, 06:56 AM	#2
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,622	Re: way to tell if a factory big block truck There should be some mention of it on the SPID inside the glovebox door. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

06-13-2009, 07:30 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: way to tell if a factory big block truck Look for a factory exhaust bracket for dual exhaust.I`m assuming there`s no SPID. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ Last edited by special-K; 06-13-2009 at 07:54 AM.

06-13-2009, 08:21 AM	#5
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,854	Re: way to tell if a factory big block truck Probably would have a high hump trans cover unless it is a 3 speed manual. Should have a heat shield on the bottom of the pass floor. A couple of places to start... __________________ 67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto

06-14-2009, 12:09 AM	#6
71 super Registered User Join Date: Sep 2005 Location: Canton North carolina Posts: 3,080	Re: way to tell if a factory big block truck Heat shield is a good place to start for sure- the bolts that hold it in place are 5/16 phillips head bolts, if things are changed usually this gets over looked. The dual exhaust hangers are another good thing to look for and the correct motor mounts should be a clam shell type if a true 72 bb truck. The fan shroud was prob. not changed out either so it will be visably different from a small block truck. __________________ 67 blue step side- bb 68 gold and white swb cst anniversary 68 custom swb hot rod Ls swap 69 swb cst 6 cylinder/ overdrive 69 black/black cst bb swb 70 orange and white cst Canada built truck swb bb 71 black and white super swb bb 71 red and white super swb 72 green and white super swb 4x4 62 nova wagon 400 series Ls swapped 68 Camaro 327/4 speed- 1 owner, original paint 66 Volkswagen bettle 69 auto stick Volkswagen Beetle

06-14-2009, 04:52 AM	#7
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: way to tell if a factory big block truck The left fender will have mounting holes for the power steering reservoir if the truck came with power steering. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

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