Holley low mount A/C bracket kit 20-159 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Wgesnerjr** · 05-12-2019, 01:36 PM

Just got done installing the low mount Holley A/C mount in the truck. Very nice kit. Bracket is top notch with all hardware included. Instructions were good and gave part numbers for tensioner, compressor and belts that are needed but not included.

About the only thing the instructions could have included was that the bracket should be installed BEFORE the engine is mounted in the truck! (Holley should use that fact as a marketing tactic) It can be done after the fact, but boys is that a PIA! It did clear my eBay motor mount brackets and the frame very well. Now I am just waiting on the sanden type compressor to arrive. If Amazon can get it to me today I will see how it fits.

layinrocker65 · 05-13-2019, 02:05 AM

I have the same setup. Just some advice, when you mount the compressor, put the rear bolts on first. Then tighten the bolts(Allen head) by putting the Allen wrench through the front mounting holes. Once the front bolts are in, it’s a huge pain to get to the rears.

**Wgesnerjr** · 05-13-2019, 06:48 AM

Good to know! Another great item for the instruction sheet!

cebra · 05-13-2019, 01:13 PM

Does anyone know if this AC mount works with Dirty Dingo sliders?

toddoky · 05-13-2019, 03:13 PM

Quote:

Originally Posted by cebra

Does anyone know if this AC mount works with Dirty Dingo sliders?

It would depend on the specific amount of set-back adjustment you use with the slider brackets and what accessory drive system you are using. The further back in the chassis you place your engine, the greater the amount the slider brackets extend towards the front of the engine, so they will encroach into the same space required to install the Holley A/C bracket. Running the Holley bracket at the truck accessory drive offset will give you the most room to work with in regards to fitting with the engine brackets and the Corvette accessory drive offset would provide the least amount.

NorCalAnthony · 05-15-2019, 08:30 PM

@toddoky or Wjesnerjr, do you know if this will work in a 4x4 73-87 truck getting an 6.0 truck engine? Looks like the OP is using it in the same vintage 2wd but I don't know what would be different between the two in that spot that would keep it from working... Already have a high mount bracket that came with my Vintage Air kit (not installed yet) but I'm not a fan of how that looks and would much rather have it down low in the stock location like this.

**Wgesnerjr** · 05-15-2019, 09:45 PM

engine set back is the key. the closer to the radiator, the better. So far with the eBay mounts, the bracket is clearing everything, but the compressor is not. it is hitting the bracket the motor mounts bolt to. just by 3/4 inch, but enough to stall the project.

My buddy is coming over this weekend and we will remove the bracket and relieve some metal to accept the compressor. stay tuned.

unfortunately, I am not familiar enough with 4x4 to say. mine is 2WD.

toddoky · 05-15-2019, 10:57 PM

Adjustable stacked plate type mounts come with an engine height penalty and are far less compatible with low mounted accessory drive components than compact stationary engine brackets are, which is why that design configuration is not used in any of the Hooker Blackheart LS swap systems.
Posted via Mobile Device

**Wgesnerjr** · 05-19-2019, 10:00 PM

Very true. My buddy and I lifted the engine. (Not easy) pulled the motor mount bracket and shaved off 3/4 of an inch. Compressor clears with ease. We then realized the compressor would not install into compressor bracket without lifting engine. ( ugh!) This brought on another issue. The motor mount bolt needs to go in from front to back. Couldn't do that after compressor was installed. (Grrr!)

**Wgesnerjr** · 05-19-2019, 10:12 PM

Decided to go against conventional wisdom and install the motor mount bolt from rear to front. Only problem is the nylock nut was too think and would hit the back of the compressor. (@#$=&%) Went to ACE hardware and found a skinny nylock nut that worked perfectly. Used some wsshers under the bolt head to move it back some.

Works perfectly. 1/16 of an inch clearance but neither are expected too move alot. Installed belt and tensioner and runs nice.
Checked wiring and all work well.

Next steps are custom hoses and freon charge! Then a cool summer.

**Wgesnerjr** · 05-19-2019, 10:19 PM

Just a bit of advice, go with the Holley system. (Motor mount brackets, a/c mounts, etc ) WAY engineered to work together. No more second guessing.

Better plans for future

layinrocker65 · 05-31-2019, 12:38 PM

I have the dirty dingo sliders on my truck with the motor pushed back pretty good and had none of your issues. Guess I got lucky.

Ford Assassin · 12-25-2019, 08:02 PM

Quote:

Originally Posted by layinrocker65

I have the dirty dingo sliders on my truck with the motor pushed back pretty good and had none of your issues. Guess I got lucky.

Got pics? Which ac brackets are you using, Holley or Dirty Dingo?

I need to keep the nv4500 in the same spot for shifter and driveshaft reasons.

Thanks.

05-12-2019, 01:36 PM	#1
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Holley low mount A/C bracket kit 20-159 Just got done installing the low mount Holley A/C mount in the truck. Very nice kit. Bracket is top notch with all hardware included. Instructions were good and gave part numbers for tensioner, compressor and belts that are needed but not included. About the only thing the instructions could have included was that the bracket should be installed BEFORE the engine is mounted in the truck! (Holley should use that fact as a marketing tactic) It can be done after the fact, but boys is that a PIA! It did clear my eBay motor mount brackets and the frame very well. Now I am just waiting on the sanden type compressor to arrive. If Amazon can get it to me today I will see how it fits. Attached Images __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

05-13-2019, 02:05 AM	#2
layinrocker65 Registered User Join Date: Jun 2005 Location: California Posts: 521	Re: Holley low mount A/C bracket kit 20-159 I have the same setup. Just some advice, when you mount the compressor, put the rear bolts on first. Then tighten the bolts(Allen head) by putting the Allen wrench through the front mounting holes. Once the front bolts are in, it’s a huge pain to get to the rears. __________________ ‘53 GMC COE stock ‘53 Chevy 3100 LSA/TR6060 http://67-72chevytrucks.com/vboard/s....php?t=805949‘ '70 Chevy C10 LWB 350/sm465 ‘74 Chevy C10 SWB 5.3/4L80e, Vintage Air, Dakota Digital, US Mags

05-13-2019, 06:48 AM	#3
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Holley low mount A/C bracket kit 20-159 Good to know! Another great item for the instruction sheet! __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

05-13-2019, 01:13 PM	#4
cebra Registered User Join Date: Jan 2018 Location: Durham, North Carolina Posts: 782	Re: Holley low mount A/C bracket kit 20-159 Does anyone know if this AC mount works with Dirty Dingo sliders? __________________ My Daily Driver Build: http://67-72chevytrucks.com/vboard/s...d.php?t=755668

05-15-2019, 08:30 PM	#6
NorCalAnthony Registered User Join Date: Jul 2014 Location: Lincoln, CA Posts: 208	Re: Holley low mount A/C bracket kit 20-159 @toddoky or Wjesnerjr, do you know if this will work in a 4x4 73-87 truck getting an 6.0 truck engine? Looks like the OP is using it in the same vintage 2wd but I don't know what would be different between the two in that spot that would keep it from working... Already have a high mount bracket that came with my Vintage Air kit (not installed yet) but I'm not a fan of how that looks and would much rather have it down low in the stock location like this.

05-15-2019, 09:45 PM	#7
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Holley low mount A/C bracket kit 20-159 engine set back is the key. the closer to the radiator, the better. So far with the eBay mounts, the bracket is clearing everything, but the compressor is not. it is hitting the bracket the motor mounts bolt to. just by 3/4 inch, but enough to stall the project. My buddy is coming over this weekend and we will remove the bracket and relieve some metal to accept the compressor. stay tuned. unfortunately, I am not familiar enough with 4x4 to say. mine is 2WD. __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project Last edited by Wgesnerjr; 05-17-2019 at 06:05 AM.

05-15-2019, 10:57 PM	#8
toddoky Registered User Join Date: Jul 2015 Location: Bowling Green, KY Posts: 264	Adjustable stacked plate type mounts come with an engine height penalty and are far less compatible with low mounted accessory drive components than compact stationary engine brackets are, which is why that design configuration is not used in any of the Hooker Blackheart LS swap systems. Posted via Mobile Device

05-19-2019, 10:00 PM	#9
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Holley low mount A/C bracket kit 20-159 Very true. My buddy and I lifted the engine. (Not easy) pulled the motor mount bracket and shaved off 3/4 of an inch. Compressor clears with ease. We then realized the compressor would not install into compressor bracket without lifting engine. ( ugh!) This brought on another issue. The motor mount bolt needs to go in from front to back. Couldn't do that after compressor was installed. (Grrr!) Attached Images __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project

05-19-2019, 10:12 PM	#10
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Holley low mount A/C bracket kit 20-159 Decided to go against conventional wisdom and install the motor mount bolt from rear to front. Only problem is the nylock nut was too think and would hit the back of the compressor. (@#$=&%) Went to ACE hardware and found a skinny nylock nut that worked perfectly. Used some wsshers under the bolt head to move it back some. Works perfectly. 1/16 of an inch clearance but neither are expected too move alot. Installed belt and tensioner and runs nice. Checked wiring and all work well. Next steps are custom hoses and freon charge! Then a cool summer. Attached Images __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project Last edited by Wgesnerjr; 05-20-2019 at 02:10 PM.

05-19-2019, 10:19 PM	#11
Wgesnerjr Senior Member Join Date: Jun 2015 Location: Atlanta, GA. Posts: 737	Re: Holley low mount A/C bracket kit 20-159 Just a bit of advice, go with the Holley system. (Motor mount brackets, a/c mounts, etc ) WAY engineered to work together. No more second guessing. Better plans for future __________________ Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project Last edited by Wgesnerjr; 05-19-2019 at 10:45 PM.

05-31-2019, 12:38 PM	#12
layinrocker65 Registered User Join Date: Jun 2005 Location: California Posts: 521	Re: Holley low mount A/C bracket kit 20-159 I have the dirty dingo sliders on my truck with the motor pushed back pretty good and had none of your issues. Guess I got lucky. __________________ ‘53 GMC COE stock ‘53 Chevy 3100 LSA/TR6060 http://67-72chevytrucks.com/vboard/s....php?t=805949‘ '70 Chevy C10 LWB 350/sm465 ‘74 Chevy C10 SWB 5.3/4L80e, Vintage Air, Dakota Digital, US Mags



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