[RodgerH]

The ARP 250-2201 bolts are 3/4" long. The shoulder is 1/4" long, the threads are 1/2" long. I still have them....looking at them...never returned them to Summit after determining they were too short. The 3/4" length was the problem...too short....not enought thread engagement. You can go back and re-read the details.

The Mr. Gasket bolts (p/n 911) are advertised as 1" long. Looking at the enlarged picture on Summit's website, it looks like the shoulder may be 1/4" long and the threads may be 3/4" long.

I don't know why they are different lengths, yet both are claimed to be Ford or OEM replacement?

Rodger