14 bolt SF vs FF

[454cid]

Most seals on my 91 6.2 k2500, 92 G20 van and 93 c3500 6.5 TD were rtv. If I bought gaskets they seemed to fail rtv didn't. And thst is how they did it before rubber reusable seals (God I love those)

I can't stand RTV. It always looks like someone applied the whole tube with a putty knife. If you don't use the whole tube, it's dried up by the time you want to use it again. I had to use some on my Saturn, and thankfully I found a little packet of it... still looks crappy on the engine though. Paper gaskets are older tech, and work pretty well, usually.

I have a plastic and rubber reusable gasket on my 4L80E's oil pan, and what I think is molded silicone on my valve covers. Those are nice, although the valve covers leak now, but they're original and the truck is approaching 300K miles.

 

[Schurkey]

Keep in mind that GM has a bulletin on RTV silicone vs. synthetic gear lube on full-float axle assemblies.

According to them, if you want to use synthetic lube, you have to pull the axle shafts out, clean off the silicone, and use a paper gasket. I suppose the same would apply to the rear cover. After a certain date, they put paper gaskets on the axle at the manufacturer.

Not something I would have thought of.

 

[Sparkysikes]

Like. Running ethanol on older cars stock fuel lines