Yes, the 250 inline 6 was the chev engine. I don't know what yours looks like but here's a link you've probably seen. Easy to undo the aircleaner for a better look and compare with the ebay ad. Looks like it is both activated by 12V and some sort of oil pressure drop, perhaps doubles as anti-dieseling when shut off. Not sure.
www.elcaminocentral.com
I believe the original GM number is #7040316 as per this ad. But I don't know if there were variations based on A/C or emissions etc, looks like the same part as your ad.
Seeking an Idle Solenoid for 1977 250 Cubic Inch El Camino
Hello all, I have a 1977 El Camino with the 250 Cubic Inch engine, with manual transmission, NO air conditioning, and the stock 1 barrel carburetor. I need to replace the idle stop solenoid. I've searched everywhere on the Internet, including most of the "Classic Chevy" types of vendors. I...
www.elcaminocentral.com
I believe the original GM number is #7040316 as per this ad. But I don't know if there were variations based on A/C or emissions etc, looks like the same part as your ad.
GM NOS Air Conditioning Idle Up Solenoid (Fast Idle Solenoid) 7040316 | eBay
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www.ebay.com
