.....yes it's for a 392 Hemi that's hooked to a turbo 400 trans. Actually the bolts that came with the transmission adapter/flexplate are 7/16" but the flange on the crankshaft was tapped to 1/2" x 20. So I drilled the flexplate & aluminum spacer hub out to 1/2" {actually 33/64"}. I didn't even think of using ARP bolts! I just went out & bought grade 8 ones. I'll check on the ARP & I will look at the 7/16" bolts that Hot Heads sent to see if they have star washers! {I'm thinking I saw some in the box!}. Didn't even think of that! Thanks Pat & Denny! Bill