Big block motor mounts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMCshorty · 11-25-2011, 06:52 PM

Hi there. Just a quick question. I have a 71 GMC that I just put a 454 into in place of the stock 350. I used the big block rubber mounts and the small block frame stands. Everything bolts up fine using all the factory holes. My question is does the big block stands move the engine location any? I know they are shaped different for exhaust clearance , but is that the only differance? Thanks.

**too much stuff** · 11-25-2011, 07:04 PM

Not positive, but i think they lower the engine a little also.

ItsRandy · 11-26-2011, 12:28 AM

I used the small block stands when I first put a big block in my '69. Worked well but exhaust (headers) was real tight. I have big block stands now...way more exhaust clearance.

fastwillie 696969 · 11-26-2011, 12:30 AM

Quote:

Originally Posted by too much stuff

Not positive, but i think they lower the engine a little also.

yes they do drop down lower at least mine did

GMCshorty · 11-26-2011, 02:11 AM

Thank you. I would use the big block mounts but cant find a set for a decent price. Found one set new and the guy wanted $500 for them. So I figured i would just notch the small block ones to clear my Sanderson headers. I just was worried the small block ones would have the big block in the wrong position and I would have fan to rad issues or firewall issues.

heeroyue2002 · 11-26-2011, 02:31 AM

cant you also use the square body BBC brackets.

SS Tim · 11-26-2011, 05:28 AM

Quote:

Originally Posted by GMCshorty

...I would use the big block mounts but cant find a set for a decent price. Found one set new and the guy wanted $500 for them...

If you already have the BB uppers all you need are BB frame stands right? Should be a lot less than $500.00. Think the application splits are 68-71 and 72 only.

cdowns · 11-26-2011, 05:48 AM

i think these are square body ones// the guy has been trying to sell for at least 6months on craigs here and he cant get $60

http://daytona.craigslist.org/pts/2697978563.html

heeroyue2002 · 11-26-2011, 07:14 AM

IIRC if you didnt care about being year correct, the square brackets worked fine.

bobs409 · 11-26-2011, 07:28 AM

Quote:

Originally Posted by GMCshorty

Thank you. I would use the big block mounts but cant find a set for a decent price.

PM sent

Shyguy · 11-26-2011, 10:05 AM

When we put the 454 in my '71 the small block stands would not work with the headers I had so we used the BB mounts and stands that came with the '74 454 and they worked fine.

**Classic Heartbeat** · 11-26-2011, 11:15 AM

I have both for sale. (Less that $500.00 too)
http://67-72chevytrucks.com/vboard/s...d.php?t=481402
http://67-72chevytrucks.com/vboard/s...d.php?t=493105
WES

GMCshorty · 11-26-2011, 06:11 PM

lol wow thanks everyone that was easy. My one question is do they lower or move the engine forward or back from where the small block has it? My oil pan is pretty tight right now for height to the crossmember.

11-25-2011, 06:52 PM	#1
GMCshorty Registered User Join Date: Jul 2010 Location: Calgary, Alberta Posts: 19	Big block motor mounts Hi there. Just a quick question. I have a 71 GMC that I just put a 454 into in place of the stock 350. I used the big block rubber mounts and the small block frame stands. Everything bolts up fine using all the factory holes. My question is does the big block stands move the engine location any? I know they are shaped different for exhaust clearance , but is that the only differance? Thanks.

11-25-2011, 07:04 PM	#2
too much stuff Roadtrip! Join Date: Feb 2003 Location: Grand Rapids MN Posts: 13,717	Re: Big block motor mounts Not positive, but i think they lower the engine a little also. __________________ 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

11-26-2011, 12:28 AM	#3
ItsRandy Registered User Join Date: Nov 2010 Location: Grand Terrace, Ca. Posts: 1,607	Re: Big block motor mounts I used the small block stands when I first put a big block in my '69. Worked well but exhaust (headers) was real tight. I have big block stands now...way more exhaust clearance.

11-26-2011, 02:11 AM	#5
GMCshorty Registered User Join Date: Jul 2010 Location: Calgary, Alberta Posts: 19	Re: Big block motor mounts Thank you. I would use the big block mounts but cant find a set for a decent price. Found one set new and the guy wanted $500 for them. So I figured i would just notch the small block ones to clear my Sanderson headers. I just was worried the small block ones would have the big block in the wrong position and I would have fan to rad issues or firewall issues.

11-26-2011, 02:31 AM	#6
heeroyue2002 fat old dude Join Date: Feb 2010 Location: fresno, california Posts: 1,424	Re: Big block motor mounts cant you also use the square body BBC brackets. __________________ 1972 c-10 shortbed 350/400 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=389157 1968 workhorse http://67-72chevytrucks.com/vboard/s...d.php?t=446216 Accepting part donations

11-26-2011, 05:48 AM	#8
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Big block motor mounts i think these are square body ones// the guy has been trying to sell for at least 6months on craigs here and he cant get $60 http://daytona.craigslist.org/pts/2697978563.html __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

11-26-2011, 07:14 AM	#9
heeroyue2002 fat old dude Join Date: Feb 2010 Location: fresno, california Posts: 1,424	Re: Big block motor mounts IIRC if you didnt care about being year correct, the square brackets worked fine. __________________ 1972 c-10 shortbed 350/400 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=389157 1968 workhorse http://67-72chevytrucks.com/vboard/s...d.php?t=446216 Accepting part donations

11-26-2011, 10:05 AM	#11
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Big block motor mounts When we put the 454 in my '71 the small block stands would not work with the headers I had so we used the BB mounts and stands that came with the '74 454 and they worked fine. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

11-26-2011, 11:15 AM	#12
Classic Heartbeat Project Junkie! Fishing Poor!! Join Date: Dec 1999 Location: Olympia,Wa. 98512 Posts: 10,770	Re: Big block motor mounts I have both for sale. (Less that $500.00 too) http://67-72chevytrucks.com/vboard/s...d.php?t=481402 http://67-72chevytrucks.com/vboard/s...d.php?t=493105 WES __________________ On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys

11-26-2011, 06:11 PM	#13
GMCshorty Registered User Join Date: Jul 2010 Location: Calgary, Alberta Posts: 19	Re: Big block motor mounts lol wow thanks everyone that was easy. My one question is do they lower or move the engine forward or back from where the small block has it? My oil pan is pretty tight right now for height to the crossmember.



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