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Discussion in 'Original Drivetrain Topic' started by bkmont, May 27, 2018.
Can anybody share a picture of the correct powering steering cap for a 1970 Z28?
View attachment 58642
I believe this to be correct
As far as I can tell, it is a 70 only "9 bump". Also used on Chevelles and probably others in 70. This is a "transition" cap from the earlier metal style used on 69 and earlier and the 18 bump style on 71 and laters. The 18 bump style came in at least two versions that had different text on the top.
These come up once in awhile on eBay. I paid 30 for mine. I saw a couple at a swap meet this weekend but they were on pumps and they didn't want to separate them. If I would have brought an 18 bump I think they would have.
An often overlooked part. Once you see this, it is interesting that many concours level cars have the wrong cap.
Thanks! Just wondering. I came across one in my shop that has the 9 bumps but i think the wording is a little different.
How about the below picture? What did this come off of? It is 9 bump cap
Not to much help and if correct for a 70 Z , but a find a pic of a 9 bumps cap with different wording.
I have two pumps with 9 bumps caps, not sure about wording(need to check)
My 74 original pump has the 18 bumps cap with the same wording as bkmont cap.
Go figure. About the time I think I know something. The "Do not overfill" seems to start in the 75 to 77 time frame. I had never seen a 9 bump version of that. I have not seen any 70 9 bumps with it.
My 9 bump 70 but not a Z28.
Here is a pic of the cap on my 71 Z28. It's the cap that came with the car in 1971. 9 bump with Do Not Overfill wording.
I need to increase my sample set! Its hard to tell as this gets changed out so easily and the replacement pumps more than likely come with 18 bump version. At least we have some solid definition now.
Found this on Team Camaro.