WTB: Oil pressure sender for `70 GSX

I need one for a `70 GSX with factory gauges, new or good used. CARS lists the `70 as being different than a `71-`72 but they are out of them right now. I believe the difference is the threads. The `70 is 1/8" npt and the `71-`72 is 1/4" npt.

 

The difference is a 70 is an 80lb unit and 71/72 is a 60lb unit. A 60lb will not show the correct pressure on a 70 guage. Also this is my understanding of the sending units but I can be wrong.

 

I have just like the one pictured but it has the bigger thread and there is a Part number on a label # 6462849 I would sell mine for $40 shipped.

 

Thanks Jerrod, but I can't use the one with the 1/4" threads.

This begs the question whether the ebay unit is the correct pressure rating o No:

 

Thanks Jason. I checked their website for a price for comparison and nothing turned up for the sending unit. If nothing else turns up here in the next day or so I'll probably take a chance on the ebay item.

 

It also look just like the 3 new 60# units I have

 

Hi Bill, I sell alot of Chevy and Olds stuff as well. I have a used 80# with 1/8 thread.Olds used the same line of thought, They too started in 68 with a 80# and went to a 60 in 71 when the HP was decreased. However Chevy offered both. The used one I have has average plating on it but I do know it works, 40.00 to your door, Let me know if can help,Chuck

 

The originals didn't look like the one on the e-bay listing. They didn't have a long nipple like that sticking out the end and had two flat spots on the bowl area.

The originals looked like this 80 PSI original 70 455 unit.

Picture courtesy of James Weinman
Duane

 

I do not believe lower horsepower had anything to do with the oil pressure senders. The oil pressure should be the same or even higher on a 71 with the bigger oil tube. My guess is it has something to do with the oil pressure increasing for 71. The correct sender Duane shows also looks like the 71 unit. They have part numbers and date codes on them as well. I think they also have 60 or 80 on them. The generic gold one sold on ebay and inline tube is available everywhere. It is made in Taiwan. One of the nicest looking women I ever met was from Taiwan. I actually melted when she talked to me. Cannot say the same for the looks of that ugly gold unit.

 

Sounds good to me, Chuck. PM on the way. Thanks.

 

I might be wrong on this but the the larger oil passages and pickup gives you more volume at less pressure. With the larger oil system you would need less pressure due to less friction loss. Also there would be less leaks

 

"The correct sender Duane shows also looks like the 71 unit."

Here is a pic of the other numbers on the part, with the date code of "318 9".

It was taken off a 70 455/Stage 1 car and it matched the car as far as date codes and part numbers are concerned.

The full numbers stamped into the part are as follows
80 6462558 318 9 and they decode as follows
(80) PSI for gauge
(6462558) Part number for an early 70 455 80 psi sending unit
(318 9) Date code, as in it was assembled on the 318th day of 69

Where is all this revisionist history coming from regarding thread sizes changing between 70 and 71 sending units? The elbows they screwed into remained the same until very late in the 71 production year, and even then the 72 cars used the same sending units as the second half 70 thru 71 cars.
Duane

PS. The sending unit part number was changed during the 70 production year to the "60 PSI" part number, possibly at the same time the oil pasages were opened up in the motors.

Picture also courtesy of James Weinman

 

Another thing to consider,
Do not put a cad plated oil sending unit (for a gauge equipped car) on a 1970 Model if it's going to be in any type of Concours/restored judged event. The bowls of the ones put on the production cars were painted black.

It's the "NOS" pieces that were CAD plated.

Another case where "NOS" pieces are incorrect.
Duane

 

Yeah, I learned that the hard way at BG. The car this one is going on is a driver but I plan to paint it black anyway.