Big Block Oil Cap

[Jimmy G.]

I ran accross an odd BB oil cap with a square "s" Logo in the rivet. Any one know what it is for.

[Peter L.]

Re: Big Block Oil Cap

65 & maybe early 66

[Jimmy G.]

Re: Big Block Oil Cap

Guess I should keep it for my 65 396 then ???

[Bill W.]

Re: Big Block Oil Cap

Is it greenish black ?

[David S.]

Re: Big Block Oil Cap

As Pete said, it is definitely original for a 65 396 and also commonly seen on early 66 big blocks. The finish ranges from a green tint to an all black. I have several of each type (round s and square s) and the ones with original finishes all differ.

Best,
Dave

[Peter L.]

Re: Big Block Oil Cap

I thought the early caps were painted black & that it was the plated caps that had the "mysterious" green tint. Will we ever know after 50 years??????????? Pete

[Bill W.]

Re: Big Block Oil Cap

Hi Pete . The original cap from 396 # 16120 is painted black over silver cad . It has a round S on the rivet and the small square SM in a circle next to it .

[Jimmy G.]

Re: Big Block Oil Cap

Almost a gloss black finish

[Bill W.]

Re: Big Block Oil Cap

Yes Jimmy , it is a very shinny semi gloss .

[David S.]

Re: Big Block Oil Cap

Pete,

I didn't say the cap was plated! I said the finishes range from a green tint to a black. Typically the early caps I have seen/ have are black over cad. But one in particular that I have does not appear to have ever been black. Of course over the last 50 years it could have burnt off or chipped off. Who knows!?

Best,
Dave

[Peter L.]

Re: Big Block Oil Cap

Bill - The 1966 NCRS TIM&JG in the Oil Fill System, Big Block reads "Cap are plated black which may have a tendency to turn a greenish hue. The letter "S" is stamped into the rivet, also stamped next to the rivet is a single stamping of the Stant Manufacturing trademark symbol which is "sm" inscribed within two concentric circles."
The photo of an example shows the rounded "S" but examples with the square "S" have been observed & like many things like running changes occurred during Production. Also, close examination of the "sm" stamping shows it to be SMC in a circle.
I expect the new 1965 NCRS TIM&JG will detail the information on the 1965 Big Block Oil Filler Cap.
Pete

[Bill W.]

Re: Big Block Oil Cap

Pete.I took my cap outside in the semi warm Il.sun and it is black with no shades of green .I have seen the green ones but I dont have any . This is the one off 16120 as you can see it has had a hard life and has been dropped a few times .DSCN1825.jpgDSCN1826.jpgDSCN1828.jpgDSCN1831.jpg

[Peter L.]

Re: Big Block Oil Cap

Bill - Thanks for the photos. Personally, I think the "paint" jobs of these caps wasn't the greatest & under heavy acceleration that the 396s were know to be subject to the paint flaked off. Pete

[Bill W.]

Re: Big Block Oil Cap

DSC_1493.jpgDSC_1492.jpgDSC_1495.jpgDSC_1497.jpgPete .It might have peeled off on Walkers but my car is still mostly in Zip lock bags & plastic tubs .

[Jimmy G.]

Re: Big Block Oil Cap

Here are a couple of photos of my 396 currently

489 CID 600 HP 600 ft pounds of tourque Tremec 5 speed Street Shop Chassis

And a whole lot more fun to drive





HP1010028.jpgP1010029.jpgP1010030.jpg