Toyota puts a gnd wire(s) onto the lift hooks. The passenger side has two wires and one is probably 2x bigger than the other.

Question is, is this gnd location for making a gnd connection (gnd wires to head), or is it to gnd the heads (head to gnd wires)?

There is so much metal connected to the heads I am not sure why they would need to gnd the heads that way. But in same token there's a lot of places to take those gnd wires if the wires just needed a gnd location, etc.

 

They might be for RFI reduction from the coil-on-plugs

Chip H.

 

So you thinking it's more for grounding the heads.

I am thinking more like helping the gnd side of the spark plugs. The cap-coils should not emit Rf, but they will make a mag field with every pulse. The plugs might emit some Rf noise from the spark.

Both sides have a #16 or #18awg white w/ black stripe, but the passenger side also has a solid black in ~#12. So maybe it's for dual purpose.

I removed the lift hooks and took some #12 wire with large solder rings and bolted them to one of the lift hook bolts, then on other end used smaller solder rings on the wire and then using #10 machine screw just bolted the wire to the OEM wire end, etc.

Installing the intake w/o the lift hooks there makes installation so much easier.

Note: those lift hook bolts on the heads, it appears they only tapped the holes deep enough for bolt AND lift hook thickness. w/o lift hooks the bolts seem to bottom out before the bolt head flange makes contact, so if anyone does this just add a washer of right size (about 1/8" thick, diameter no bigger than bolt head flange).