npk

I have a 77 f150 with a 460. I would like to replace the valve springs. The parts stores has two different springs listed for this engine. They have different uncompressed lengths. How do I know which ones I need without removing one and taking it to the store? Does the length matter? The engine came from a 77 van.

Thanks

I tried the ford dealer. Their books only go back to 1980

Trapper

My books show only one for YMs 74 thru 82, all trucks 460 engine. It shows installed height of 1 51/64ths to 1 53/64ths, obviously in inches. Spring test is 80lbs at 1.81". Hope that was helpful info.

npk

Thanks for the info. I cross referenced it with the stores website and think I have it figured out