67 Oil Drain Plug Question

[Kirk M.]

67 327/300 hp car. The Tech Guide states that the oil drain plug should only have a 1/8" thick head. I have purchased several "original" plugs from reputable dealers and they all have 1/4" thick heads on them although they are listing them as 67 oil drain plugs. Are the originals really that thin? Anyone have a picture? Thanks.

Kirk

[Joe L.]

Re: 67 Oil Drain Plug Question

67 327/300 hp car. The Tech Guide states that the oil drain plug should only have a 1/8" thick head. I have purchased several "original" plugs from reputable dealers and they all have 1/4" thick heads on them although they are listing them as 67 oil drain plugs. Are the originals really that thin? Anyone have a picture? Thanks.

Kirk

Kirk------


I don't know if the original drain plug heads were EXACTLY 1/4" thick but they were a a LOT closer to 1/4" thick than they were to 1/8" thick. I don't know where someone came up with that 1/8" thick dimension.

[William C.]

Re: 67 Oil Drain Plug Question

I haven't seen anyone ever measure one under the car, if they look good, they probably are. I don't think that part of the manuals has been changed since the original release around 1983 or so, when Joe Clark and I were writing the first versions and needed to define the pan drain plug, in the middle of the winter without a handy example, so we did what we could from memory. Judges seem to know the intent and I'm surprised the wording has lasted this long...

[John H.]

Re: 67 Oil Drain Plug Question

67 327/300 hp car. The Tech Guide states that the oil drain plug should only have a 1/8" thick head.

Kirk -

You must be working from a really OLD JG; that oil drain plug description was revised years ago to read "7/8" across the flats and approximately 1/4" thick".

[Kirk M.]

Re: 67 Oil Drain Plug Question

OK, so much for that. When I get some batteries for my camera, I will take some pics and get your opinions. Thanks.

Kirk

[Rich P.]

Re: 67 Oil Drain Plug Question

Here is a pic of an original concidering the head is 7/8" it looks closer to 1/4" than 1/8"

Rich

[Wayne M.]

Re: 67 Oil Drain Plug Question

Kirk -

You must be working from a really OLD JG; that oil drain plug description was revised years ago to read "7/8" across the flats and approximately 1/4" thick".

Kirk -- plug should look like this, minus the magnetic tip. The "circle A" is just one of the acceptable head markings.

[Donald O.]

Re: 67 Oil Drain Plug Question

Here is a pic of an original concidering the head is 7/8" it looks closer to 1/4" than 1/8"

Rich

Should be orange though. Yours looks like mine does otherwise.

DonO

[Kirk M.]

Re: 67 Oil Drain Plug Question

That looks like exactly what I have! What head markings are acceptable for 1967 SB oil pans?

Kirk

[Jack H.]

Re: 67 Oil Drain Plug Question

Fasteners, like most of GM's purchased parts, were almost exclusively sourced from multiple qualified suppliers. It was a NOSEBLEED exercise in salesmanship to get a sole source qualification for a purchased part!

The headmarks I've seen on these oil pan plug bolts include: A, Circle-A, L, TR and F-C. I'll bet there were others as vendors were known to change their ID marks and some suppliers got out of the business while others entered over time...

[David S.]

Re: 67 Oil Drain Plug Question

This picture was posted either on this forum or the Corvette Forum. I saved it to my computer as a reference.



-Dave