[A26B]

Jim,

New injectors should come with all the o-rings you need EXCEPT for the lower o-ring seal inside the injector housing on the primaries. I recommend these o-rings for replacement bucause they are old and no longer seal as effectively as new ones. Lower o-rings leaking will result in vacuum leaks & idle problems.

A few other things to check while you're under there.

Regarding secondary actuators: If they look like they are installed incorrectly with the arm at an angle, leave them alone as long as the secondaries were working OK before you pulled the plenum. The actuator can be rotated to make the arm straight to the linkage but it will not work as smoothly as before.

Tighten the crankcase breather box bolts. They are probably loose and seeping oil into the valley.

Obtain some silicone grease and use it on all the electrical connection weather seals when you go back together. It is also useful on the plug wires at the coils and a little on the plug boot makes for a better seal and easier to install & remove.

When you replace the coils, remember the silicone grease on the coil base contacts & seals.

Plug wires? I would put in the same category as coils. It takes a plenum pull to replace them. GM replacements are quality and don't cost alot.

You can go deeper if you want, but it requires starter removal to clean the valley and make sure the drain hole is clear.

PS: I can provide all the LT5 gaskets & seals you might need. www.jerrysgaskets.com