Cross posting. Post is on FirebirdNation but there is zero activity over there.
So I'm doing my first carb adjustment and I need some help. When adjusting the idle mixture screws, I can't seem to get the vacuum pressure to change. It hovers between 10 and 12 hg. See below.
https://1drv.ms/v/s!AkkAtTM66idB6HN8APtdsvBAqkSb
I used these procedures
https://www.youtube.com/watch?v=UPGLUsW5ZeE
https://www.youtube.com/watch?v=dJg8GTlnIH0
Here's a little about my engine.
Pontiac 400 block
468 stroker kit.
Comp Cam - 20210708_003529588_iOS.heic
Edelbrock Heads
Torker 2 intake
Quick Fuel SS-750 carb - 20210708_004121953_iOS.heic
Questions
What might cause the vacuum not to change when adjusting the idle mixture screws?
When adjusting the idle mixture screws can I just adjust one and then eventually the rest ... or is it best to adjust all when seeking the highest vacuum reading?
Thanks in advance!