bbc help searched with no luck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72shadetree · 03-31-2005, 11:17 PM

i bought what i thought was 72 bb towers/motor mounts.
i dont have a pic but i think theyre 73 up sb.they line up on frame rail and one hole on crossmember but 4th hole is way off on crossmember.they use the tower/mount/ and clam shell that bolts to block and use the long bolt with a nut that runs front to back thats about 5in long.

will they work with my 402 and headers/th350 with out much problems in a low hump cab. and if so will 3 bolts on tower hold it or do i need to drill the other hole in crossmember.thanks for the help henry

superchevy · 04-01-2005, 12:57 AM

here's a couple of pics of the factory mounts out of my '77 3/4 ton 454 truck. Hope it helps:

72shadetree · 04-01-2005, 10:06 AM

Quote:

Originally Posted by superchevy

here's a couple of pics of the factory mounts out of my '77 3/4 ton 454 truck. Hope it helps:

thanks they are close to what i have but where my mount is bolted to tower the corner is not overhanging.that bolt under the overhang is the hole thats not in my crossmember

55454 · 04-01-2005, 11:35 AM

The protrusions are the top of mount usually signify 1972 BB, please correct me if I am incorrect.

Thanks

junkyardjohn · 04-01-2005, 11:48 AM

THAT MOTOR MOUNT PICTURED IS A 73 ON UP M/M. THE HOLES FOR THE TOP FRAME RAIL ARE ABOUT AN INCH & A HALF CLOSER TOGETHER ON 72s, & ARE YEAR SPECIFIC. (MEANING THEY ARE A ONE YEAR ONLY ITEM) JOHN

**CPNE** · 04-01-2005, 12:15 PM

Quote:

Originally Posted by 72shadetree

thanks they are close to what i have but where my mount is bolted to tower the corner is not overhanging.that bolt under the overhang is the hole thats not in my crossmember

I've got good news for you. When I did a BB swap on a 71 with the correct 72 BB mounts, we had the same situaltion you describe, and had to drill the 4th hole. Assuming you do have the 72 BB mounts (if they don't look like the 77 version pictured you proably do), just drill the 4th hole and you're good to go.

1-PU70 · 04-01-2005, 12:28 PM

Yes when I did the BB swap with 72 towers I had to drill the 4th hole too.

72shadetree · 04-01-2005, 06:38 PM

Quote:

Originally Posted by 1-PU70

Yes when I did the BB swap with 72 towers I had to drill the 4th hole too.

thanks its the 72 towers that i got then

does anybody have a pic of 72 bb motor mount are they close to the 77

Johns70 · 04-01-2005, 08:28 PM

72 shadetree i did the exact swap your talking about, you,ll have to drill the fourth hole like they said. i put a bb and th-400 under a low hump floor and if fit really well about a inch or two clearance from the floor too the tranny.I used ceramic dynomax hearders for the 67-72 cheavy truck and they fit really nice with no problems with the factory short shaft accesories. hope this helps john

03-31-2005, 11:17 PM	#1
72shadetree KEEP ON TRUCKING Join Date: Sep 2000 Location: martinsville va Posts: 2,563	bbc help searched with no luck i bought what i thought was 72 bb towers/motor mounts. i dont have a pic but i think theyre 73 up sb.they line up on frame rail and one hole on crossmember but 4th hole is way off on crossmember.they use the tower/mount/ and clam shell that bolts to block and use the long bolt with a nut that runs front to back thats about 5in long. will they work with my 402 and headers/th350 with out much problems in a low hump cab. and if so will 3 bolts on tower hold it or do i need to drill the other hole in crossmember.thanks for the help henry __________________ 72 cheyenne 2wd lwb 71 k20 sons bassett va

04-01-2005, 12:57 AM	#2
superchevy Got big-block? Join Date: Jul 2000 Location: Austin, Texas Posts: 2,453	here's a couple of pics of the factory mounts out of my '77 3/4 ton 454 truck. Hope it helps: Attached Images __________________ '68 CST SWB factory 396/T400 buddy buckets, a/c, ps, pb '72 Corvette convertible 454/4spd/ac, ps, pb '73 GMC Sierra Grande short wide 454/T400 ps, pb, ac '77 K5 Blazer black on red, 350/T350/NP205 ps, pb, ac all original '78 GMC Sierra Classic short wide 454/T400 ps, pb, ac '72 GMC Sprint SP454. 1 of 38 built. '73 GMC Sprint SP454. 1 of 71 built. '75 GMC Sprint SP454. 1 of 25 built. SOLD! '72 GMC K25 4x4 468/4L80e/NP205 build thread http://67-72chevytrucks.com/vboard/s...23#post4324423 SOLD!'55 Chevy gasser 496/4spd build thread http://67-72chevytrucks.com/vboard/s...96#post4324396

04-01-2005, 11:48 AM	#5
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	THAT MOTOR MOUNT PICTURED IS A 73 ON UP M/M. THE HOLES FOR THE TOP FRAME RAIL ARE ABOUT AN INCH & A HALF CLOSER TOGETHER ON 72s, & ARE YEAR SPECIFIC. (MEANING THEY ARE A ONE YEAR ONLY ITEM) JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

04-01-2005, 12:28 PM	#7
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	Yes when I did the BB swap with 72 towers I had to drill the 4th hole too. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

04-01-2005, 08:28 PM	#9
Johns70 Registered User Join Date: Dec 2001 Location: Spring Creek, nevada. U.S.A. Posts: 456	72 shadetree i did the exact swap your talking about, you,ll have to drill the fourth hole like they said. i put a bb and th-400 under a low hump floor and if fit really well about a inch or two clearance from the floor too the tranny.I used ceramic dynomax hearders for the 67-72 cheavy truck and they fit really nice with no problems with the factory short shaft accesories. hope this helps john __________________ 69 chevy short wide box project 70 GMC jimmy project

04-01-2005, 11:35 AM	#4
55454 55454 Join Date: Mar 2005 Location: Lafayette La. Posts: 340	The protrusions are the top of mount usually signify 1972 BB, please correct me if I am incorrect. Thanks

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