I'm adding a factory AC system to my early 260z and need to drill the holes in the firewall to pass the AC lines thru. I purchased the correct grommet but i don't have another vehicle to reference the hole location. I'm sure i could line up where everything goes and guess but if at possible I want this to look OEM. If any of you have AC and can grab some measurements and a picture for me on the hole locations I would appreciate it.

im not sure about the early 260 but i had a late 260 and the lines went in the same place where the 280 lines went.

if late and early 260 are the same then you do not have to drill any holes in the firewall for the high and low pressure lines.

From the factory there is a block off plate screwed over the holes. Just remove it and feed the pipes thru.

when you called it "factory" what did you mean by that? datsun factory or aftermarket factory?

this is the engine compartment of a 260z with nissan factory a/c

Edited March 25, 201212 yr by hr369

yup, thats the spot and im pretty sure its the same on the 280's as well. Some measurements would get me on my way. I wasnt thinking about it at the time when i pulled all of the AC parts out of the junkyard

why do you need measurements if its the same as the 280? just pull off the block off plate on your recipient car

That's pretty much the same place where the early s30 factory AC went through the firewall, so I'd venture to say hole location was unchanged throughout the s30 production. This is a picture of a 1970 JDM car with factory AC. We have not yet verified the AC lines are in the correct position.

The car i have came with aftermarket air that was in shambles and missing pieces. I took the entire AC system out of a 280z at a junk yard so i could add it to my 260 since I know it was available as an option and besides this missing set of holes everything was a simple bolt on. My car does not have a block off plate which is why i asked for the measurements. I have done this same procedure on a fox body mustang and also a '97 Ford Ranger, they both had block off plates so i didn't have to drill anything. Heres a pic of my firewall, you can see its just flat steel.

By the way the aftermarket AC system passed thru the passenger side of the car whereas the factory system passes thru the drivers side

somebody welded up the hole. did you look from the inside of the firewall? if you scrape off the paint in the general area you can probably find the old holes. i think i see the faint outline of the top hole in the pic

nope no hole and i have the dash out too, nice and clean on both sides. Its virgin metal, even factory puke green on the inside

From the center of phillips screw head (upper left photo):

1" horizontal towards the driver fender

1 1/4" down /vertical to top copper line

From upper copper line: 1 1/8" horizontal towards driver fender

1 7/8" down/vertical to lower copper line

Measurements are centerline.

Again, 1977 factory A/C

Edited March 25, 201212 yr by Willoughby Z

That worked, thanks for the measurements. I was able to install the evaporator and all the tubes lined right up, the factory grommet looks good too.