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This have the 2 master cylinder brake system ? One on the firewall and another under the truck mounted to the frame under the seat ? I would almost try taking off the master cylinder and starting the truck to see if the seals are blown . Are the pressure return lines on correctly ?

Good , that's what I'd do with my ported heads . I would do a " line of sight " with the runners . That looks like a lot of taper on the runners and very short for the intended RPMs . You'd be doing great if that causes the heads to only lose 5 CFM .

Try checking voltage at the starter while cranking . I have a 91 Suburban 350 that eventually stopped cranking . Voltage was good at the battery end and on the starter but went to nothing when cranking . Replaced the cable , had battery voltage while cranking and started .

Nice truck . How many times have you stuck yourself in the shins with those " spikes " on the front tires ? 😁

How did the 400 to 4L80E swap go ?

There were issues with the trans harness at the connection on the side of the trans . If you pull the connector and find trans fluid in the cavity , there are updated parts to repair that . This was on the earlier trucks , I have a 91 Suburban , and the ends were different on the newer parts .

Should be JB8 . MT1 is 4L80E trans .

Did you change both of the fuel filters ?

Rock Auto is showing two different part numbers for the 96 and 97 3500 . I would think you would need to know the brake system numbers for ordering the correct parts i.e. JB7 or JD8 etc . These are on the glovebox door with all the other codes .

I've got a couple here . Do you want from where the rag joint bolts on to the end of the upper link ?

I remember reading those pages on the theory about precups when you posted them a while ago . First sentence is a red flag for me . Only 40% of the swept volume is in the prechamber ? Where is the other 60% ? Remember this is at TDC . Not happening as you have stated because of the pressure...

Right , heated air from the compression . The walls and the precup have nothing to do with the ignition as far as temp . You can start a cold engine without glows or the precup being hot as long as you have good compression . The air in the cylinder is compressed and forced into the precup by...

And how does the ignition start ? What's the one thing missing ?

No doubt the is quite a lot of air movement . What else is happening ?

Correct ! And what happens to the air after that ?

How does the cup change velocity of the air ?

So you think the precup design has to do with after the fuel has been ignited ?

Where did you get all this ?

Cruise module , slides up into bracket by brake pedal . Couple different numbers but 85 - 91 diesel 25110882 . 85 - 91 gas 25110868 .

Chime is on the relay box to the right of the steering column . It has the blinker and some other stuff . The wiper delay is the one with the ribs directly under the steering column when you take the small plate off the lower dash panel . I think what you are asking about might be cruise control .