Motor Mount Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

REPO1 · 03-10-2005, 11:07 PM

Can someone tell me for sure if the motor mount towers are the same or different between the big block and the small block?

Also can someone post a picture of an actual BB motor mount itself?

And lastly, if someone had a part number for NAPA to purchase the motor mount for a big block that would be awesome.

Thanks!

Reid

Longhorn Man · 03-11-2005, 01:30 AM

no pics here...but they are DEFINATLY different.
There are 2 different big block towers... the 68 - 71...diret cheap, but the motor mounts are expensive...the 72 style, the towers are expensive...but the motor mounts are cheap.

REPO1 · 03-11-2005, 01:38 AM

Hmmmm that sucks then. I had a pair of small block ones laying around and cleaned them & painted them already. I took a quick look at the ones already in my '70 (402) and thought they looked the same. Are the small block ones just taller? What is the noticable difference?

Thanks for the help!

sdkid · 03-11-2005, 01:41 AM

I believe the BB towers are notched for the exhaust manifold. I used SB towers in my '68 when I put the 396 in it. I don't remember if I modified them or what. I used headers. Oh yea... BB towers have a huge hole in them for the bolt to the mount.

REPO1 · 03-11-2005, 01:45 AM

Does anyone have an actual picture of the rubber motor mount itself? (BB)

sdkid · 03-11-2005, 02:28 AM

Ebay auction for the towers...
http://cgi.ebay.com/ebaymotors/ws/eB...category=34202

Tx Firefighter · 03-11-2005, 08:38 AM

Read the article I did in the FAQ section on cheap big block mounts. It shows how to use the cheap early big block stands with small block rubbers.

I've been through this frustration before a few times, so I posted pictures and descriptions. Using the article, you can get big block mounts pretty cheap.

Longhorn Man · 03-11-2005, 08:59 AM

Here are the ones listed in the auction...thesae shouldn't get too much $$
Misadvertised as 67 - 72...they are actually 68 - 71

Rod · 03-11-2005, 09:49 AM

BB rubber mount GM NOS part number 3997595 for 68-71...there ya go. Thats what was listed when I saw it posted somewhere. I couldn't find the number in my parts book..but thats not so unusual as numbers changed over the years. My parts book lists the numbers 3986604 as mounting, engine -front, upper for engine front 68-71 396/400.

REPO1 · 03-11-2005, 09:56 AM

Quote:

Originally Posted by Rod

BB rubber mount GM NOS part number 3997595 for 68-71...there ya go.

Excellent! Thats what I need.

I already have a set of small and a set of the big stands, but I hadn't realized they were different, as the BB stands are still in the old frame with the motor on them. (couldn't see the difference)

Now all I need is to find a new pair of the rubber mounts.

Rod · 03-11-2005, 10:04 AM

Had this pic too..I think it correct rubber mounts on the brackets...I had it named BB.

Swbman · 03-11-2005, 03:57 PM

heres some 67-71 with the correct rubber.

REPO1 · 03-12-2005, 11:04 AM

Can I use motor mount brackets from a '82 1/2 ton and install '82 rubbers?

**FRENCHBLUE72** · 03-12-2005, 05:59 PM

I have my 454 on sb stands and the fit is pretty good.. I did however just score a set of bb mount so I will be trading up here soon.

REPO1 · 03-12-2005, 10:35 PM

Quote:

Originally Posted by REPO1

Can I use motor mount brackets from a '82 1/2 ton and install '82 rubbers?

Nevermind, they don't line up with the factory holes.

03-10-2005, 11:07 PM	#1
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Motor Mount Question Can someone tell me for sure if the motor mount towers are the same or different between the big block and the small block? Also can someone post a picture of an actual BB motor mount itself? And lastly, if someone had a part number for NAPA to purchase the motor mount for a big block that would be awesome. Thanks! Reid __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

03-11-2005, 01:41 AM	#4
sdkid Registered User Join Date: Sep 2004 Location: Pierre SD Posts: 1,533	I believe the BB towers are notched for the exhaust manifold. I used SB towers in my '68 when I put the 396 in it. I don't remember if I modified them or what. I used headers. Oh yea... BB towers have a huge hole in them for the bolt to the mount. __________________ I think the world needs a drink... Help somebody...If you can....VanZant We're not wrong, we're not sorry, and its probably gonna happen again. That's the truth about men. Tracy Byrd Member# 13924 '70 c10, 350/350 '68 c10 250/4spd '68 c10 no eng/trans fac ps/pb/ac/at (future father/sons project) '48 Chevy Loadmaster

03-11-2005, 02:28 AM	#6
sdkid Registered User Join Date: Sep 2004 Location: Pierre SD Posts: 1,533	Ebay auction for the towers... http://cgi.ebay.com/ebaymotors/ws/eB...category=34202 __________________ I think the world needs a drink... Help somebody...If you can....VanZant We're not wrong, we're not sorry, and its probably gonna happen again. That's the truth about men. Tracy Byrd Member# 13924 '70 c10, 350/350 '68 c10 250/4spd '68 c10 no eng/trans fac ps/pb/ac/at (future father/sons project) '48 Chevy Loadmaster

03-11-2005, 08:38 AM	#7
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Read the article I did in the FAQ section on cheap big block mounts. It shows how to use the cheap early big block stands with small block rubbers. I've been through this frustration before a few times, so I posted pictures and descriptions. Using the article, you can get big block mounts pretty cheap. __________________ I'm on the Instagram- @Gearhead_Kevin

03-11-2005, 09:49 AM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	BB rubber mount GM NOS part number 3997595 for 68-71...there ya go. Thats what was listed when I saw it posted somewhere. I couldn't find the number in my parts book..but thats not so unusual as numbers changed over the years. My parts book lists the numbers 3986604 as mounting, engine -front, upper for engine front 68-71 396/400. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

03-11-2005, 01:30 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	no pics here...but they are DEFINATLY different. There are 2 different big block towers... the 68 - 71...diret cheap, but the motor mounts are expensive...the 72 style, the towers are expensive...but the motor mounts are cheap.

03-11-2005, 01:38 AM	#3
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Hmmmm that sucks then. I had a pair of small block ones laying around and cleaned them & painted them already. I took a quick look at the ones already in my '70 (402) and thought they looked the same. Are the small block ones just taller? What is the noticable difference? Thanks for the help!

03-11-2005, 01:45 AM	#5
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Does anyone have an actual picture of the rubber motor mount itself? (BB)

03-11-2005, 08:59 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Here are the ones listed in the auction...thesae shouldn't get too much $$ Misadvertised as 67 - 72...they are actually 68 - 71

03-11-2005, 10:04 AM	#11
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Had this pic too..I think it correct rubber mounts on the brackets...I had it named BB. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

03-11-2005, 03:57 PM	#12
Swbman Senior Member Join Date: Mar 2004 Location: Tulsa,Oklahoma Posts: 606	heres some 67-71 with the correct rubber. Attached Images __________________ 1961 BUICK LESABRE 1968 CHEVELLE SS 396 1969 BUICK RIVIERA GS 1971 2 WHEEL DRIVE BLAZER 1971 4X4 BLAZER 1971 SHORTBED CHEYENNE FLEETSIDE 1971 SHORTBED 4X4 FLEETSIDE ** ...My Ebay

03-12-2005, 11:04 AM	#13
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Can I use motor mount brackets from a '82 1/2 ton and install '82 rubbers? __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

03-12-2005, 05:59 PM	#14
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	I have my 454 on sb stands and the fit is pretty good.. I did however just score a set of bb mount so I will be trading up here soon. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..



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