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#1 |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Went from 80s to 70s block, alternator bracket is longer....
My accessory bracket for alternator is longer than the set up my 80s block had, which I was worried about before I swapped to 70s block, (3970010) power steering pump side is fine but alternator side is touching passenger fender well. Can just swap brackets going back with the shorter one from other block???
The headers on driver side are touch frame also.....figured just grind something down or cut into frame a little????
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#2 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,522
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Re: Went from 80s to 70s block, alternator bracket is longer....
I've never seen any kind of bracket like that. Must be some kind of aftermarket thing. Stock alt with short water pump is above the PS pump. By the way, year of the small block really doesn't matter with the accessories. Use what you have with the truck or get a period correct set with everything in the right place
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#3 |
Registered User
Join Date: May 2016
Location: Willow, Alaska
Posts: 877
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Re: Went from 80s to 70s block, alternator bracket is longer....
Your lowest picture is a factory correct late 80’s accessory drive. Use that one.
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#4 |
Registered User
Join Date: Sep 2002
Location: Liberty, Mississippi
Posts: 671
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Re: Went from 80s to 70s block, alternator bracket is longer....
The engine in the top picture looks to be out of a C50 or C60 series truck due to the brackets and the short style water pump with the thermostat bypass port on top of the pump.
You can use the waterpump and accessories from the engine in the lower picture. |
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#5 | |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
Would it be a problem if alternator is touching fender well....if not I'll leave it......I don't have my old water pump from old setup......what about the headers touching??
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#6 | |
Registered User
Join Date: Sep 2002
Location: Liberty, Mississippi
Posts: 671
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
What are the headers originally for, if they are touching the frame? |
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#7 | |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
As far as headers I'm just gonna go back with stock, it fits right back in fine.
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#8 |
State of Confusion!
![]() ![]() Join Date: Jul 2002
Location: Gulfport, MS USA
Posts: 46,858
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Re: Went from 80s to 70s block, alternator bracket is longer....
If you are going to run an O2 sensor, you may need to reposition where the sensor goes. If your not, plug the hole and just notch the frame rail a hair to clear.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#9 | |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
What you recommend of my alternate space situation?? I have to dig for my old set up brackett....hope i can find but if not???
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#10 |
State of Confusion!
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Location: Gulfport, MS USA
Posts: 46,858
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Re: Went from 80s to 70s block, alternator bracket is longer....
Use the mounts that came with the truck, not engine ones. That may solve most of your issues.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#11 |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
After lifting and dropping enigne back and forth, I swapped to my old cups on the new block and they fell on fine, the others had a difference in height just enough to not seat. So some things aren't all interchangeable as said , I'm learning.....
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#12 | |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
Yeah just went back with my old mount cups, my original mount blocks were still on the frame.....
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#13 |
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Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,008
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Re: Went from 80s to 70s block, alternator bracket is longer....
If you can't find your alternator brackets I have some I'm trying to get rid of
http://67-72chevytrucks.com/vboard/s...d.php?t=815660
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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#14 |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Concerned about torque converter, or is it okay??? I made sure it was seated before bolting block up, but when I started buttoning it up to flywheel, it slide about 3 centimeters flush to flywheel, just enough of threads shown in pic below, maybe 2 centimeters, just double checking if this is normal and I'm over alert.....checked clearance between converter and pump and it's still hand tight....so should it be okay??
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. Last edited by ellisjay2; 08-03-2021 at 04:26 PM. |
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#15 |
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Re: Went from 80s to 70s block, alternator bracket is longer....
The converter should be up tight against the flexplate not spaced away like it is in the pictures. Do you have the correct length bolts from flexplate to converter? Post some numbers off each engine if you can, the stamped numbers in front of the RH head and the block casting. That will help narrow down some of the major differences between the two.
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com Last edited by MJN; 08-04-2021 at 11:44 AM. |
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#16 | |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
The number on the block in is 3970010 My old one was 14093638 The converter is flush tight once I run all the bolts in, I just noticed and got concerned when the bolts pulled converter towards flywheel as it snugged up, the space in the picture is when I leave bolts unscrewed to show how much it moves, once I run them in converter as I said earlier moves the shown thread distance and you dont see anymore threads, its flush. This is the stock 350 tranny thats been there.
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. Last edited by ellisjay2; 08-05-2021 at 05:48 PM. |
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#17 |
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Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: Went from 80s to 70s block, alternator bracket is longer....
There two or three thing it could be, is the flex plate on the right way. The TQ converter is too wide trans, ATT: if the TQ converter is not all the way in the trans input shaft and you try to start your motor you will blow up the transmission oil pump $50. part but you have then rebuild the trans now to fix. The TQ converter should slide like three clicks in and be pretty firm snug to back. I did about 5 trans and motor be for I found out about this the fresh trans rebuild I got had to be rebuilt it was not all the way in this was 33 years ago.
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#18 | |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Quote:
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. |
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#19 |
Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: Went from 80s to 70s block, alternator bracket is longer....
Make sure it is the right year break down for the Flex plate the trans, your are using. Oh there is a 152 tooth and a 168 tooth 81-90 and the the big starter 70-82 If I recall the years correct.
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#20 |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
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Re: Went from 80s to 70s block, alternator bracket is longer....
Did the crank have a pilot bushing or bearing installed in it?
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#21 |
State of Confusion!
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Location: Gulfport, MS USA
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Re: Went from 80s to 70s block, alternator bracket is longer....
I would examine the flex plate/flywheel from your original engine and see if it looks any different from the one on the 80 block. There is always a small bit of pull on the convertor when you tighten them to fly wheel. My convertors always moves a tad when I tighten them to flex plate. I think you may be OK, but I never looked that hard on mine on how much spacing it had before I tightened them.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#22 | |
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Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 752
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Re: Went from 80s to 70s block, alternator bracket is longer....
AS said
Quote:
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#23 |
Registered User
Join Date: Feb 2014
Location: marietta ga
Posts: 147
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Re: Went from 80s to 70s block, alternator bracket is longer....
Going back with my old accessory brackets, but lost most of my bolts, and trying to find the easiest way to get the correct sizes, or find a kit that has them together...
power steering pump bracket pump to bracket alternator bracket alternator to bracket water pump mounting bolts...i guess new comes with all you need anyway. A pic of my 80s block set up thats going on the 70's block now,( cast number 3970010)
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: ![]() 86 gmc 2500 longbed Carb 5.7, rwd, 400 tranny. Last edited by ellisjay2; 08-06-2021 at 07:33 PM. |
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