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#1 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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66 gmc ls swap...need help!
Hey all, working on dropping a 4.8 into my 66 gmc and having a devil of a time getting it in. I'm using dirty dingo clam shell adapters and have the v8 engine mounts in the truck. When I set the engine down on the mounts I'm off by about a half in on either side, as if the engine is too wide. Anyone else run into this problem?
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14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#2 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 gmc ls swap...need help!
Exactly what 'V8 engine mounts' are you using?
Have you searched for an answer in the LSx swap section of this forum?
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#3 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
The precious owner had a big block in the truck, so I'm just going with what was there already. I haven't had a chance to really dig through the other section, made this post from under the truck last night while still trying to wrestle the engine in. I'll do some searching though.
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14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#4 | |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 gmc ls swap...need help!
If you could post a few pics of what you are working with it help us help you.
Quote:
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#5 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
I'm trying, for some reason it's not letting me upload them from my phone.
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14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#6 |
Registered User
Join Date: Jun 2012
Location: Portland
Posts: 1,330
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Re: 66 gmc ls swap...need help!
Upload them to a site like Photobucket first, then you can link them here.
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#7 |
Registered User
Join Date: Nov 2011
Location: indianapolis in
Posts: 26
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Re: 66 gmc ls swap...need help!
More than likely it's the big block mounts or the clam shells. The both have to be from a small block Chevy because the ls is a small block chevy. There is a difference in the small block and big block clam shells.
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#8 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
Everything I have found online says the SBC and BBC clam shells are the same. How are they different?
__________________
14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#9 |
I'm just glad to be here!
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
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Re: 66 gmc ls swap...need help!
without pictures it is hard to help, but if you do have big block frame mounts and using the DD adapters, the frame mounts could be your issue. BUT, the BB frame mounts are NOT factory '66 year model parts. Those mounts did not come out till the '67-'72 body style iirc.
LS swaps in these trucks are relatively easy. What makes them hard is the vast assortment of adapters and frame mounts that are out there. Best results happen when you use the adapters and frame mounts from the same source in my opinion.
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Karl ![]() 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square |
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#10 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
Understandable. The mounts that are in the truck where in it when I came into possession of it. Finally got the pictures to send from my phone to my photo bucket, so here they are. First two are with the engine set down level on both mounts. The measurement is how far off either side is when one of the mounts is lined up. Sorry it took a while, been super busy and haven't gotten a chance to actually get on from a computer.
![]() ![]() ![]() ![]() I plan on getting a set of new SBC clamshell mounts (only $20) because i realize these are a bit worn out. Was trying to test fit the engine to see how far foreword or back it would need to be.
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14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. Last edited by Slammed96; 03-28-2017 at 05:33 PM. |
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#11 |
Registered User
Join Date: Nov 2011
Location: indianapolis in
Posts: 26
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Re: 66 gmc ls swap...need help!
This might clear some of it up
http://67-72chevytrucks.com/vboard/s...d.php?t=649056 |
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#12 | |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
Quote:
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14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#13 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 gmc ls swap...need help!
Those engine mounts are '73-'87 style. I can't tell from the pics if the frame brackets are from a C10 or a C20/30. If they are from a C10, that is part of the problem. Those do not fit the early frames correctly without a spacer on top of the frame. Without changing the frame brackets, you will have to search and try and find a set of clamshells that are shorter. That or a different set of Ls engine mount plates like these.
http://www.ebay.com/itm/Dirty-Dingo-...dW3aG-&vxp=mtr I do not know if these will cure your issue, but they might be worth inquiring about. AZ Pro Performance is a forum Vendor here. The more I look at those pics the more I am now fairly certain those are from a C10 and they put them on the wrong side, slid them down and drilled new holes.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE Last edited by Captainfab; 03-29-2017 at 12:47 AM. Reason: Added info |
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#14 |
I'm just glad to be here!
Join Date: Jan 2008
Location: Longview, TX
Posts: 4,788
|
Re: 66 gmc ls swap...need help!
I agree with Captain. Those frame mounts may be more of your issue than the clam shells. You might be better off ordering a set of these mounts:
http://www.ebay.com/itm/1963-66-68-6...item58e8ffeb5e You can still use the adjustable sliders that you already have to set the fore/aft placement of the engine.
__________________
Karl ![]() 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square |
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#15 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
Another option I've considered is slightly elongation the holes in the frame mounts to allow for some adjustment up and down. I wanted to see other opinions in case the problem was something I'm doing wrong.
__________________
14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#16 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
|
Re: 66 gmc ls swap...need help!
If you are set on keeping those engine mount brackets, unbolt them from the frame and crossmember. Then bolt the brackets, engine mounts and clamshells to your engine. Set the engine in place where you want it and mark the bolt holes on the crossmember and measure how thick of a spacer you need on top of the frame. You may need to trim the top flange of the frame back a little to duplicate the '73-'87 frames.
__________________
Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#17 | |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
|
Re: 66 gmc ls swap...need help!
Quote:
__________________
14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#18 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
Posts: 190
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Re: 66 gmc ls swap...need help!
Looks like you need different mount perches
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#19 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 156
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Re: 66 gmc ls swap...need help!
The deeper and deeper I look into this, the more I see that it appears the easiest and least headache route to take will be new perches as stated above. Saw some pictures of the remedies for the mounts I have and not a fan. Looks like time for new motor mounts and towers...thanks for all the help and info guys!
__________________
14 Silverado- 4/6 drop daily 66 GMC short wide Custom Cab- building to be low and cruise. 4.8/t56 swap occurring now. Stupid low static drop ![]() 66 GMC 1 ton stepside looooong bed- the tow pig/work truck. |
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#20 |
Registered User
Join Date: Dec 2016
Location: Lacey, WA
Posts: 190
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Re: 66 gmc ls swap...need help!
like i said, perches
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