what is the difference ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

biglou55 · 06-22-2004, 11:08 AM

what is the difference in the BB motor mounts Don,t they bolt up the same. they didn,t change the style of the frame did they. the reason i ask is my 454 is a 76and i want to put it in a 72 frame. I can see the diff. in style but i must be missing something?. will the mounts from 73-up fit.

please straighten me out. thank,s biglou55.

biglou55 · 06-22-2004, 12:45 PM

TTT? anybody

**CPNE** · 06-22-2004, 01:03 PM

I'll take a stab for ya.

68-71 BB mounts are similar to small block mounts. Don't buy 67 BB mounts as no BB were offered in 67

. These year mounts are cheaper because they are more of them, but the mount pad (not correct term) is really expensive. No mod install.

72 mounts are a clamshell design and are 1 year only. Consequently supply/demand means you pay more for them. The mount pad is much cheaper however. No mod install, but you may have to drill an extra hole in the engine x-member.

73-up mounts are similar to 72 mounts, but are taller due to frame height difference on the 73-up years. These will require modifications to mount and/or frame to make them work.

As far as I know, all styles will physically bolt onto your 76 454 block

biglou55 · 06-22-2004, 03:05 PM

Thank,s CPNE now i will be on a quest for 68-71 mounts and pads.

Harold Shepard · 06-22-2004, 08:11 PM

Biglou55,
Energy suspension makes the poly replacement pads for 68-71, and the stands are still (last time I checked) available from GM and not too expensive. Several people have had them listed on the board over the past couple of weeks. The stands in any case are relatively cheap, but the mounts themselves (5 pieces total) are expensive. The '72 mounts are the exact opposite, stands discontinued from GM expensive if you can find them but the pads are cheap. Jerry Brown in Crossville, Tn. would be a good person to contact about these parts. He is a nice man and will help you get anything that you need. Email is trucks72@thetruckshop.com

Tx Firefighter · 06-22-2004, 09:25 PM

Guys, I run the cheap 68-71 big block frame stands with small block mounts. The small block mounts are like 6 bucks new. The BB frame stand has a very large hole where the bolt goes through and into the mount. I just run a harmonic balancer bolt washer on it to keep the bolt from pulling through the oversize hole.

The small block mounts bolt right to the big block engine and line up perfectly on the big block frame stand.

This current truck is the second time I've done a big block this way, with never any problems. Total cost is usually somewhat less than 100 for all the parts.

06-22-2004, 11:08 AM	#1
biglou55 Senior Member Join Date: Sep 2002 Location: Greenfield Mass. Posts: 551	what is the difference ? what is the difference in the BB motor mounts Don,t they bolt up the same. they didn,t change the style of the frame did they. the reason i ask is my 454 is a 76and i want to put it in a 72 frame. I can see the diff. in style but i must be missing something?. will the mounts from 73-up fit. please straighten me out. thank,s biglou55. __________________ Certifiably crazy person Last edited by biglou55; 06-22-2004 at 11:11 AM.

06-22-2004, 12:45 PM	#2
biglou55 Senior Member Join Date: Sep 2002 Location: Greenfield Mass. Posts: 551	TTT? anybody __________________ Certifiably crazy person

06-22-2004, 01:03 PM	#3
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	I'll take a stab for ya. 68-71 BB mounts are similar to small block mounts. Don't buy 67 BB mounts as no BB were offered in 67 . These year mounts are cheaper because they are more of them, but the mount pad (not correct term) is really expensive. No mod install. 72 mounts are a clamshell design and are 1 year only. Consequently supply/demand means you pay more for them. The mount pad is much cheaper however. No mod install, but you may have to drill an extra hole in the engine x-member. 73-up mounts are similar to 72 mounts, but are taller due to frame height difference on the 73-up years. These will require modifications to mount and/or frame to make them work. As far as I know, all styles will physically bolt onto your 76 454 block __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

06-22-2004, 03:05 PM	#4
biglou55 Senior Member Join Date: Sep 2002 Location: Greenfield Mass. Posts: 551	Thank,s CPNE now i will be on a quest for 68-71 mounts and pads. __________________ Certifiably crazy person

06-22-2004, 09:25 PM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Guys, I run the cheap 68-71 big block frame stands with small block mounts. The small block mounts are like 6 bucks new. The BB frame stand has a very large hole where the bolt goes through and into the mount. I just run a harmonic balancer bolt washer on it to keep the bolt from pulling through the oversize hole. The small block mounts bolt right to the big block engine and line up perfectly on the big block frame stand. This current truck is the second time I've done a big block this way, with never any problems. Total cost is usually somewhat less than 100 for all the parts. __________________ I'm on the Instagram- @Gearhead_Kevin

06-22-2004, 08:11 PM	#5
Harold Shepard Registered User Join Date: May 2004 Location: Canton North Carolina Posts: 466	Biglou55, Energy suspension makes the poly replacement pads for 68-71, and the stands are still (last time I checked) available from GM and not too expensive. Several people have had them listed on the board over the past couple of weeks. The stands in any case are relatively cheap, but the mounts themselves (5 pieces total) are expensive. The '72 mounts are the exact opposite, stands discontinued from GM expensive if you can find them but the pads are cheap. Jerry Brown in Crossville, Tn. would be a good person to contact about these parts. He is a nice man and will help you get anything that you need. Email is trucks72@thetruckshop.com



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