'71 LT1 rubber oil fill cap markings?

[George W.]

What is correct?

[Terry M.]

Re: '71 LT1 rubber oil fill cap markings?

What is correct?

Pictures???

Description???

There are pictures in the 1970-72 TIM&JG, but I have no way to extract them from the manual, so please share with us the nature of your issues.

[Ron G.]

Re: '71 LT1 rubber oil fill cap markings?

George,

On page 114 of the new 70-72 JM there is a pic of the 71-72 rubber oil cap. There are two versions. One is shorter and the other a little taller. The latter is easier to remove. We believe that the shorter cap may have been used by Tonawanda and the taller by Flint. One of my cars is an LT-1 and it came with the shorter configuration. Second design has thicker letters where it says OIL. Originals are a thinner configuration.

[Gary B.]

Re: '71 LT1 rubber oil fill cap markings?

It should look something like this...

20210529_133530.jpg

[Joe L.]

Re: '71 LT1 rubber oil fill cap markings?

George,

On page 114 of the new 70-72 JM there is a pic of the 71-72 rubber oil cap. There are two versions. One is shorter and the other a little taller. The latter is easier to remove. We believe that the shorter cap may have been used by Tonawanda and the taller by Flint. One of my cars is an LT-1 and it came with the shorter configuration. Second design has thicker letters where it says OIL. Originals are a thinner configuration.

Ron-------


If there were differences, they occurred within a part number. The only part number for the 71-74 rubber oil fill cap was GM #3980273. That part number was available in SERVICE until March, 1986 when it was replaced by GM #14067301. The latter was discontinued in April, 1987 and replaced by GM #14094764. Finally, the latter was discontinued in November, 1989 and replaced by GM #10110859. The latter remains available.

The 3980273 had the word "OIL" in large font size. The supercessive part numbers had different variations of lettering on the cap but, as far as I know, were otherwise the same as the 3980273.

[Tim G.]

Re: '71 LT1 rubber oil fill cap markings?

Here's a December build oil cap from my 1,400 mile 1971 LT1.

[Joe L.]

Re: '71 LT1 rubber oil fill cap markings?

Here's a December build oil cap from my 1,400 mile 1971 LT1.

Tim------


I'm surprised this cap is still usable. These things harden over time with age and heat cycles. They don't change much in appearance but they become so hard that removing and installing them becomes almost impossible.Maybe the low miles and, thus, few heat cycles have helped preserve yours.

[Ron G.]

[Larry M.]

Re: '71 LT1 rubber oil fill cap markings?

I recall seeing posts with photos of an orange rubber version of this cap. Was it ever determined if they were produced by GM?

[Joe L.]

Re: '71 LT1 rubber oil fill cap markings?

I recall seeing posts with photos of an orange rubber version of this cap. Was it ever determined if they were produced by GM?

Larry------


Not that I know of. However, in some cases I think these caps were installed on the engine prior to its painting and, thus, are painted engine orange.

[Larry M.]

Re: '71 LT1 rubber oil fill cap markings?

Thanks, Joe.

[George W.]

Re: '71 LT1 rubber oil fill cap markings?

Thank you,
Just what I needed

[Ron G.]

Re: '71 LT1 rubber oil fill cap markings?

George,

I know our fellow DB posters have already answered your concern, but my two cents is that all Survivor/Bowtie cars that I have observed with the rubber oil cap was always painted. Like our friend Joe L. indicated, they were definitely on the engine prior to painting. Also, this right in line with the research that I and my judging collages have done with personnel from the Flint Engine Assembly Plant.

[Tim G.]

Re: '71 LT1 rubber oil fill cap markings?

Ron, I imagine that the LT1 cap would be the exception to that since the valve covers are not painted.

[Joe L.]

Re: '71 LT1 rubber oil fill cap markings?

Ron, I imagine that the LT1 cap would be the exception to that since the valve covers are not painted.

Tim-----


Yes.