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#1 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
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#2 |
Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,227
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Re: 66 GMC Long to Short LS Swap
The wheels will work perfectly fine not resting on the hub - many aftermarket wheels have larger bores than the hubs they need to ride on, and they are fine.
Just tighten the wheel nuts progressively and evenly, since they are now lug-centric. This may result in some imbalance, but you will know once it's on the road.
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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#3 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,247
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Re: 66 GMC Long to Short LS Swap
I agree that you can get away with being lug centric instead of hub centric. I've done it many times. There are no OEM 6 lug rotors that will work. You are stuck with 6 lug aftermarket rotors.
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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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#4 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Thanks Skinny and Captain, never would have thought it was ok to be lug-centric. I might machine a spacer to slip over the hub on the rotor and bring it out to the proper size. I was already thinking about trying to machine a spacer plate so my stock wheels would clear the callipers. Might try to make one piece that solves both problems.
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#5 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Well a busy spring and summer has kept me out of the shop. A few weeks ago I went to a local show and shine and came across this beauty which got me fired up to get in the shop again!!
![]() Got the ball rolling again with a few small items. Cleaned up and painted the steering linkage. Installed the new power steering box and new steering components on the truck. Got the new front shocks installed as well. ![]() ![]() ![]() ![]() ![]() Finished tearing down the motor as well. In the process of cleaning up the block and getting rid of some rust before it goes off to the machine shop. ![]() ![]() ![]() |
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#6 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Looking for some opinions on this kit from Summit for my rebuild. Looks decent to me but this is my first motor build.
https://www.summitracing.com/int/par...illocation=int |
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#7 |
Registered User
Join Date: Aug 2009
Location: Lacombe, Alberta
Posts: 335
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Re: 66 GMC Long to Short LS Swap
Not sure if that kit would work with your cathedral ports. I thought you were just going to hone it and re-ring using your old pistons? What are your goals with the motor?
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#8 | |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Quote:
I had originally planned on re-ringing the old pistons but for the price of the new ones I figure i might as well replace them while i have it torn down. Goal for the motor is to make it solid, reliable, and wake it up a little with a new cam. |
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#9 |
Registered User
Join Date: Aug 2009
Location: Lacombe, Alberta
Posts: 335
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Re: 66 GMC Long to Short LS Swap
Kit looks good, pretty much everything you need. You installing all the bearings and checking clearances? I always worry about buying a bunch of parts and showing up at the machinists saying, "help me", and I didn't buy from them. But maybe they don't care and are happy to just do the labour.
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#10 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
I'll be putting the motor together and checking clearances. Should be dropping the block off at the machine shop tomorrow. I would prefer to buy the parts through the shop but i doubt they will be able to match the price from Summit.
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#11 |
Registered User
Join Date: Jul 2015
Location: Placentia, CA
Posts: 344
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Re: 66 GMC Long to Short LS Swap
Anyone else following Duncan’s build, feel lazy?
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#12 |
Registered User
Join Date: Feb 2012
Location: Beautiful BC, Canada, eh?!
Posts: 2,227
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Re: 66 GMC Long to Short LS Swap
Check Rock Auto too. I've found them to be cheaper than Summit, and local shops cannot touch their prices. Even with shipping.
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1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate |
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#13 |
Registered User
Join Date: Aug 2009
Location: Lacombe, Alberta
Posts: 335
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Re: 66 GMC Long to Short LS Swap
I find with a lot of stuff from Summit that, once I do the dollar conversion, Mopac is bang on for pricing.
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#14 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Got the block dropped off at the machine shop. Their prices are pretty good so I think I'll buy all my parts through them. Got to work on modifying the wiring harness using the info from LT1swap.com. Took a few hours to get all the old loom and tape off. Pulled all the unneccesary wires out of the harness.
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#15 |
Registered User
Join Date: Jun 2010
Location: Jackson, ME
Posts: 287
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Re: 66 GMC Long to Short LS Swap
Dunkan, do you have a link by chance on where you got the information, looks like you have printed pages for pinouts as well. I've done a number of searches over there and just find people that are talking about doing a swap.
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65 short step edited by staff |
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#16 | |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Quote:
This series of videos on YouTube is really helpful as well https://www.youtube.com/watch?v=RHIVd_SkB9Y&t=710s |
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#17 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Finished work on the wiring harness for now. Not going to tape it up and put new loom on until i can lay it out on the motor.
Got the block back from the machine shop along with most of my parts. ![]() ![]() ![]() I've built a ton of dirt bike engines, but this will be my first vehicle engine. I've been researching clearances on these motors. Crazy how much conflicting info there is out there. Decided to use the clearance numbers i got from the machine shop. after cleaning the block I got the mains installed. Checked the clearances with the plasigauge, and then with a mic and bore gauge. I didn't find the platigauge very accurate or consistent. ![]() ![]() Installed the crank and torqued down the main caps ![]() ![]() ![]() Cleaned up the old pistons and rods, and pulled the old rings off. Picked up a new sleeve of platigauge. Got the new rod bearings installed and checked the bearing clearances. I got much better measurements this time. ![]() ![]() ![]() Checked the ring gaps and installed the new rings. Got one bank of pistons and rods put in. ![]() ![]() ![]() |
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#18 |
Registered User
Join Date: Aug 2009
Location: Lacombe, Alberta
Posts: 335
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Re: 66 GMC Long to Short LS Swap
Looking great man. Any plans for boost?
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#19 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
No plans for boost. Just not in the budget right now with all the other stuff i still need for this build.
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#20 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Did a little more work done on the motor. Finished installing the other bank of pistons and rods. Lubed up the new Comp Cam and slid it in place. New billet roller timing set, and a high flow Melling oil pump.
![]() ![]() Taped up the block and hit it with a coat of rust converter followed by a few coats of Chevy Orange. Painted the front and valley covers as well. Buttoned up the bottom end with a freshly hot tanked oil pan. ![]() ![]() ![]() ![]() |
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#21 |
Registered User
Join Date: Oct 2014
Location: somewhere . . .
Posts: 942
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Re: 66 GMC Long to Short LS Swap
nice progress on the project ...
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dont want to hear excuses, i want to hear solution(s) |
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#22 |
Registered User
Join Date: Aug 2009
Location: Lacombe, Alberta
Posts: 335
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Re: 66 GMC Long to Short LS Swap
Keep the updates coming
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#23 |
Registered User
Join Date: Apr 2013
Location: Olathe KS
Posts: 154
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Re: 66 GMC Long to Short LS Swap
Nice build! Depending on how low you are you may consider an f body oil pan for your set up. The truck pans hang a bit low for my comfort on a lowered truck. Also, curious if that's a boyds welding fuel tank you webt with, and if so, how low it hangs below the frame?
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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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#24 | |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Quote:
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#25 |
Registered User
Join Date: Oct 2017
Location: Calgary, Alberta
Posts: 208
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Re: 66 GMC Long to Short LS Swap
Got my heads back from the machine shop, had them vacuum tested, tanked, and decked. Installed the new seals and dual springs
![]() ![]() I blasted and painted the water and power steering pumps, all the pulleys and brackets and got them painted up and mounted. Dropped in some new lifters and bolted the heads on. ![]() ![]() ![]() ![]() Blasted and painted the motor mounts ![]() ![]() Coat of paint on the transmission as well ![]() At this point the engine is pretty much button up. Still need to clean up the coils and brackets and throw the intake on. Also planning to get the alternator shell blasted and painted. |
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