72 vs 73 BBC engine mount towers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

409biscayne · 11-22-2005, 12:35 PM

What are the differences between 1972 vs 73 Big Block engine mount towers? I need a set for my 72 sb to bbc conversion . I can buy new 73 towers at my local GM dealer for aprox $29 each . Do they fit the same holes ? I can't find any used at the wreckers in my area. Whatta ya think ??

**truckdude239** · 11-22-2005, 01:48 PM

they should be the same don't hold me too it

ratrod67 · 11-22-2005, 06:12 PM

I just went through this about 2 weeks ago. The bolt holes on the 73+ wont line up. You will have to drill them and hope you have your engine placement is right or your transmission crossmember wont line up with the holes in the frame. You also have to worry about driveshaft length. The 72's fit without any modifications. I can get you pics of the 72 mounts if you want. I know where an extra set are.

409biscayne · 11-22-2005, 06:19 PM

Quote:

Originally Posted by ratrod67

I just went through this about 2 weeks ago. The bolt holes on the 73+ wont line up. You will have to drill them and hope you have your engine placement is right or your transmission crossmember wont line up with the holes in the frame. You also have to worry about driveshaft length. The 72's fit without any modifications. I can get you pics of the 72 mounts if you want. I know where an extra set are.

Yeah , pics would be very helpful

, i'm not sure what i'm looking for . I did buy the stands for a 67-71 , but i'd really like to find the 72's . That extra set is not for sale , is it ??
Many thanks.

67-72williso · 11-22-2005, 07:24 PM

Also 73-up frames are 1/2" taller too. I ran into that with 4X4 engine crossmembers.
Later Willis

ratrod67 · 11-22-2005, 09:46 PM

Here's a couple pics of the 72 style mounts. The 73+ have 2 of the "bumps" on the top of the frame mount compared to the 72's 1 "bump".

chevymad · 11-22-2005, 10:22 PM

Quote:

Also 73-up frames are 1/2" taller too. I ran into that with 4X4 engine crossmembers.
Later Willis

Only some of them. I'm not sure what the rule is though. My 74 gmc 454 c10 had the 1/2" taller frame. But a 73 c20 and a 78 c20 crew cab had the same height frames as my 70.

11-22-2005, 12:35 PM	#1
409biscayne Senior Member Join Date: Nov 2005 Location: Spokane , Wash. Posts: 790	72 vs 73 BBC engine mount towers What are the differences between 1972 vs 73 Big Block engine mount towers? I need a set for my 72 sb to bbc conversion . I can buy new 73 towers at my local GM dealer for aprox $29 each . Do they fit the same holes ? I can't find any used at the wreckers in my area. Whatta ya think ?? __________________ Can-Am Motorsports 37 Chev Coupe 331 4 speed 5.13 posi . ex-gasser . 64 Biscayne 409 2x4 4 speed 4.11 posi 65 Nova Wagon Drag Car 383 t400 (Dragin-Wagon) 68 c10 cst 396 t400 a/c buckets lwb 4.11 posi (SOLD) Last edited by 409biscayne; 11-22-2005 at 12:37 PM.

11-22-2005, 01:48 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,234	Re: 72 vs 73 BBC engine mount towers they should be the same don't hold me too it __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube Last edited by truckdude239; 11-22-2005 at 01:48 PM.

11-22-2005, 06:12 PM	#3
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	Re: 72 vs 73 BBC engine mount towers I just went through this about 2 weeks ago. The bolt holes on the 73+ wont line up. You will have to drill them and hope you have your engine placement is right or your transmission crossmember wont line up with the holes in the frame. You also have to worry about driveshaft length. The 72's fit without any modifications. I can get you pics of the 72 mounts if you want. I know where an extra set are.

11-22-2005, 07:24 PM	#5
67-72williso Junk/Daily Driver Club Join Date: Feb 2004 Location: Manheim, PA 17545 Posts: 253	Re: 72 vs 73 BBC engine mount towers Also 73-up frames are 1/2" taller too. I ran into that with 4X4 engine crossmembers. Later Willis __________________ Daily Driver: 1970 C-20 400 sbc,sm-465,Dana 61 one ton SRW rear, 3.07 gears, locker. There are three kinds of people: those who make things happen, those who watch things happen, and those who have no idea what happened!

11-22-2005, 09:46 PM	#6
ratrod67 Registered User Join Date: Sep 2002 Location: DFW Texas Posts: 2,270	Re: 72 vs 73 BBC engine mount towers Here's a couple pics of the 72 style mounts. The 73+ have 2 of the "bumps" on the top of the frame mount compared to the 72's 1 "bump". Attached Images



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