Push in oil cap that actually seals.

**Lynn** · #1 06-25-2023, 04:16 AM

A few years ago I built a nice .030 350 chevy to install in my 49 Studebaker dump truck.

It has performed flawlessly, even with the 6.66 rear axle, meaning I am screaming at 4300 rpm at 65 miles an hour even with the tall truck tires (235 80 17).

My only complaint is that the push in oil cap (all rubber) does not seal well. Other than that oil cap, the engine has zero leaks even 6 years later with all the high rpm usage. Changed oil on it today and noticed the leak is bad enough it is migrating down the side of the engine. Up until now, this engine has never left a drop of oil on the ground.

I painted the engine black and bought some reproduction Studebaker decals that fit this valve cover perfectly. Most people don't know that 65 & 66 Studebakers used Chevy sixes and 283 V8s. Although, the Studebaker faithful dig in their heals and declare that they were McKinnon engines, NOT Chevy engines. Semantics. Point is, I like the way it looks and would like to keep the look. I suppose I could get a different valve cover with a screw in oil cap.

So, after that long winded story: Is there a push in oil cap that seals and lasts?

**Lynn** · #2 06-25-2023, 04:17 AM

Engine. Still looks similar. I went to a small body HEI because it was so close to the firewall.

**hogdaddy** · #3 06-25-2023, 10:43 AM

I use one in an aftermarket valve cover after a local head shop drilled a hole in it for me. It seems to seal well and it was a repop.

**Too Many Projects** · #4 06-25-2023, 12:52 PM

Have you tried to find an NOS that is still soft and pliable ? Those OE caps got quite hard and didn't seal well after several years of use in DD's either.

BCreekDave · #5 06-25-2023, 02:17 PM

maybe one of these?
https://www.mcmaster.com/products/ex...lug-type~snap/

**Lynn** · #6 06-25-2023, 03:30 PM

What is odd is that there is a push in cap on the other side. It has never leaked.
This is my third one on this side. Holes are the same size and there is no distortion or rough edges. I ended up putting a freeze plug in the oil fill tube hole in the manifold because it interfered with my upper radiator hose. If there is a rubber freeze plug that fits I may try it. Although, I am wondering if the rubber in the freeze plug will stand up to oil.

BCreekDave · #7 06-25-2023, 03:39 PM

What I posted can als be used in the freeze plug hole in the manifold.

**Lynn** · #8 06-25-2023, 04:04 PM

thanks Dave.