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'quipt4it wrote:Drawing added
Or you could drill and tap etc.

Perfect!!!
Will get this done this week

Remember, you DON'T want anything getting sucked into the engine, so make certain that it's secure. Maybe even drill for a pin and drive it in.

Just thought of a safer way.
Trace around the IAC block at the manifold mounting against paper/ cardboard. Mark the centre of the mounting holes and orifice hole.
Use this to make your restrictor out of 2mm alum. or sheet steel. Again start with a small hole for the air bleed and work up in size as required.

'quipt4it wrote:Just thought of a safer way.
Trace around the IAC block at the manifold mounting against paper/ cardboard. Mark the centre of the mounting holes and orifice hole.
Use this to make your restrictor out of 2mm alum. or sheet steel. Again start with a small hole for the air bleed and work up in size as required.

I was actually just taking to my old man and discussed the same thing. I did think about tapping a thread into and drilling out a grub screw. The restrictor plate seems a safer idea.

After pulling off the IAC block. I just realised that the previous owner was running the MAT sensor in it and had drilled and tapped it. Now I’m trying to find out what it’s true size is. If it’s smaller than the block hole this would explain a lot.

Are you sure it's smaller. If it was a provision for the IAC it would be the correct size? Just tapped.
Be prepared for some trial and error. It will likely be a matter of balancing some throttle cracking plus the correct sized hole for your needs.

Sorry to butt in and I've barely looked at the measurements in this thread. The IAC pintle size and shape changed with the LS engines as with many other years too so make sure you are apples to apples with what you are working with. Cool project

In-Tech wrote:Sorry to butt in and I've barely looked at the measurements in this thread. The IAC pintle size and shape changed with the LS engines as with many other years too so make sure you are apples to apples with what you are working with. Cool project

Thanks Man!!!

As far as I’m aware it’s right. I asked for one to suit the VL Walkinshaw.

Here is a link to an article on several valves. Scroll down the page and it's the middle one for our setup.
Remember, if you use the restrictor plate to reduce the air, the thickness of the plate affects the operating range of the IAC. Maybe 1mm instead of 2mm.
Don't forget the o-ring lol
https://www.lsenginediy.com/sensors-inputs-guide/

'quipt4it wrote:Here is a link to an article on several valves. Scroll down the page and it's the middle one for our setup.
Remember, if you use the restrictor plate to reduce the air, the thickness of the plate affects the operating range of the IAC. Maybe 1mm instead of 2mm.
Don't forget the o-ring lol
https://www.lsenginediy.com/sensors-inputs-guide/

I’m a production manager/commercial printer. We have lots of used aluminium printing plates. So I’ve cut some templates out and will punch different size holes and give them all a go.
One thing I noticed today was it will punch up a bit in revs when the air con is first switch on and the clutch engages. Then the IAC will slowly bleed down. Which then cause the revs to drop quite low. I’m going to contact the A/c guy and make sure the gas pressure isn’t too high.