L83 DOD manifold oil supply plug

[87chevy.com]

After experiencing what sounds like a collapsed DOD lifter, pulled the head and inspected #6 lifters they are locked in the right position compared to #4... not 100% sure as the heads still not back on it but after looking for solutions to prevent oil to enter the VLOM or LOMA found only one guy that sells a sleeve that looks like he tool a cylinder head down and ground it against the concrete..

Measured the hole, searched and found a dowel pin that is the right size.

Spare VLOM with the solenoids removed..



Sleeve / dowel pin



Installed with green locktite as a lube



Reinstalled the hex cap plug, turned the manifold upside down and leak tested it.. it has a tiny bit of seeping air pressure, 125psi... prob not enough that it could reach the lifter to collapse it if a solenoid stuck open (since there a bleed off port/ screen).

In the end, a complete DOD delete is the best, but this 3$ mod feels like it's worth it!