Anybody put a Big block in 1971 Blazer? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Toppless Blazer · 02-03-2007, 07:37 PM

I'm restoring my 1971 K/5 Blazer 4 x 4 with a 4 speed transmission and I want to put a big block in it. I'm wanting to know from somebody who has done this what all was involved in doing this. I would love to see some pics if possible.
Thanks,
Gary

Jtrux · 02-03-2007, 11:30 PM

I put a 396 in mine but took it out after I realized I would have to either put on a body lift (at least 2 inches, maybe 3) or move the engine and transmission crossmembers forward. I didn't do any of those things simply because I wanted everything else to still be factory specs and moving everything around didn't afford me that.

LUV2XCLR8 · 02-04-2007, 08:56 AM

Nope, but

From West TN

classicchev · 02-04-2007, 02:20 PM

Im puttin a BB in my 2wd, engine is still on the stand and waiting patiently. It is not a problem slipping these in, they just take up a little more space. Only thing is to try to get it back to the firewall as close as possible to get a little of the extra weight on to the back wheels.

darren

hellrazrblade · 02-04-2007, 04:06 PM

mine has a 396 in it (bought it like that 9 days ago). It has a 3inch body lift on it to make room. The rest of the driveline is pretty much stock except for a shift kit in the TH400 and 4.88s in the differentials.

Rokcrln · 02-04-2007, 05:13 PM

I am thinking one of the smaller 502's

would be just about right for my 70 2wd!

Kevin
LFD Inc.

watahyahknow · 02-04-2007, 07:20 PM

just hope the transfercase is up to the task

classicchev · 02-04-2007, 07:50 PM

Quote:

Originally Posted by Rokcrln

I am thinking one of the smaller 502's

would be just about right for my 70 2wd!

Kevin
LFD Inc.

One like this, someday!!!!!!!!!!!!!!!!! It would be nice to get it off the stand

70rs/ss · 02-04-2007, 08:55 PM

I have a 454 with no body lift and the motor is as far back as it'll go. You just need to use a small capped distributor.

jhow66 · 02-05-2007, 12:23 AM

Put one in this Blazer of my son's (orangeuavol):

jhow66 · 02-05-2007, 12:38 AM

We installed it on the smallblock stands and mounts and had to cut holes in firewall for valve covers to clear. Just made small boxes and welded then inside cab to cover holes. Also used stock BB exhaust manifolds. Even used SB fan shourd by cutting a small amout off the side toward engine. (used 400T and NP205)
These pictures may help:
http://pg.photos.yahoo.com/ph/jason_burkhart/my_photos

**Yukon Jack** · 02-05-2007, 11:42 AM

I have a bbc in my 69 K20. You can see info on it in this link I'm going to make some changes at some point to get the body lift down to 2".

Burt4x4 put a bbc in his K5 a while back with minimal body mods.

Burt4x4 · 02-05-2007, 11:49 AM

Yup I slaped in a 454 with SM465 trannyin my 72K5. Took a couple of months but works great. I can't get to my online pics right now as the site is down...
Go For It!

Burt

RustyParts · 02-05-2007, 02:01 PM

I put one in my '72 Jimmy, but to clear the distributor and not use a body lift, I had to move the engine and transmission/transfercase crossmembers forward 3/4". Also went to a four core radiator.

I think I'm safe in saying that if you use stock valve covers and small cap distributor you wouldn't have to modify anything except the radiator shroud.

02-03-2007, 07:37 PM	#1
Toppless Blazer Registered User Join Date: Feb 2007 Location: Roxboro, NC Posts: 15	Anybody put a Big block in 1971 Blazer? I'm restoring my 1971 K/5 Blazer 4 x 4 with a 4 speed transmission and I want to put a big block in it. I'm wanting to know from somebody who has done this what all was involved in doing this. I would love to see some pics if possible. Thanks, Gary

02-03-2007, 11:30 PM	#2
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: Anybody put a Big block in 1971 Blazer? I put a 396 in mine but took it out after I realized I would have to either put on a body lift (at least 2 inches, maybe 3) or move the engine and transmission crossmembers forward. I didn't do any of those things simply because I wanted everything else to still be factory specs and moving everything around didn't afford me that. __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

02-04-2007, 08:56 AM	#3
LUV2XCLR8 The LuvShack Garage Join Date: Jan 2004 Location: Maple Grove, TN (West Side) Posts: 30,468	Re: Anybody put a Big block in 1971 Blazer? Nope, but From West TN __________________ Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T

02-04-2007, 02:20 PM	#4
classicchev Senior Member Join Date: Nov 2003 Location: Calgary Alberta Posts: 1,936	Re: Anybody put a Big block in 1971 Blazer? Im puttin a BB in my 2wd, engine is still on the stand and waiting patiently. It is not a problem slipping these in, they just take up a little more space. Only thing is to try to get it back to the firewall as close as possible to get a little of the extra weight on to the back wheels. darren __________________ 67- 72 Parts collecter

02-04-2007, 04:06 PM	#5
hellrazrblade Purple People Eater Join Date: Dec 2006 Location: Houston Posts: 53	Re: Anybody put a Big block in 1971 Blazer? mine has a 396 in it (bought it like that 9 days ago). It has a 3inch body lift on it to make room. The rest of the driveline is pretty much stock except for a shift kit in the TH400 and 4.88s in the differentials. __________________ 1971 K5 Blazer 396ci/TH400/NP205/Dana 44/GM 12 Bolt/38" TSLs 2004 Chevy 1500 4X2 X-Cab 327ci

02-04-2007, 05:13 PM	#6
Rokcrln Senior Member Join Date: Jul 2005 Location: Winters Ca. 95694 Posts: 4,843	Re: Anybody put a Big block in 1971 Blazer? I am thinking one of the smaller 502's would be just about right for my 70 2wd! Kevin LFD Inc.

02-04-2007, 07:20 PM	#7
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: Anybody put a Big block in 1971 Blazer? just hope the transfercase is up to the task __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts

02-04-2007, 08:55 PM	#9
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,270	Re: Anybody put a Big block in 1971 Blazer? I have a 454 with no body lift and the motor is as far back as it'll go. You just need to use a small capped distributor.

02-05-2007, 12:23 AM	#10
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Anybody put a Big block in 1971 Blazer? Put one in this Blazer of my son's (orangeuavol): Attached Images __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

02-05-2007, 12:38 AM	#11
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: Anybody put a Big block in 1971 Blazer? We installed it on the smallblock stands and mounts and had to cut holes in firewall for valve covers to clear. Just made small boxes and welded then inside cab to cover holes. Also used stock BB exhaust manifolds. Even used SB fan shourd by cutting a small amout off the side toward engine. (used 400T and NP205) These pictures may help: http://pg.photos.yahoo.com/ph/jason_burkhart/my_photos __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 02-05-2007 at 12:40 AM.

02-05-2007, 11:42 AM	#12
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Re: Anybody put a Big block in 1971 Blazer? I have a bbc in my 69 K20. You can see info on it in this link I'm going to make some changes at some point to get the body lift down to 2". Burt4x4 put a bbc in his K5 a while back with minimal body mods. __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

02-05-2007, 11:49 AM	#13
Burt4x4 Registered User Join Date: Feb 2000 Location: Modesto, CA Posts: 1,842	Re: Anybody put a Big block in 1971 Blazer? Yup I slaped in a 454 with SM465 trannyin my 72K5. Took a couple of months but works great. I can't get to my online pics right now as the site is down... Go For It! Burt __________________ 1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks

02-05-2007, 02:01 PM	#14
RustyParts Registered User Join Date: May 2006 Location: Wyman, Kentucky Posts: 403	Re: Anybody put a Big block in 1971 Blazer? I put one in my '72 Jimmy, but to clear the distributor and not use a body lift, I had to move the engine and transmission/transfercase crossmembers forward 3/4". Also went to a four core radiator. I think I'm safe in saying that if you use stock valve covers and small cap distributor you wouldn't have to modify anything except the radiator shroud. Attached Images __________________ 1972 GMC Jimmy, 4WD, 454 CI, 350 Turbo, 4" lift, 35" tires The math teacher said my son "Bubba" could be a mathmatical genius. cause he's got 13 fingers!



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