I haven't found any thread discussing proper torque converter bolts for performance converters so I'll ask it here. Using the usual B&M SFI flexplate (#10230) that is 0.150" thick, what torque converter bolts do you use for a converter that has the 7/16"-20 bolt holes? The ARP#240-7302 bolt shows the underhead bolt length at 0.500" so that would mean there is only 0.350" of thread (0.500-0.150=0.350") into the converter lug. That doesn't seem like enough for a 7/16" bolt. I don't see anything listed for other bolts in the 5/8" length range.
ATI sent bolts with their 8" Treemaster converter but they have washers that make the head too thick and they then kiss the block. I called ATI and was told just not to use the washers but with the small hex head, it doesn't seem to cover as much clamp area as the more rounded-head 12-pt ARP bolts. These ATI bolts are, however, 5/8" long in underhead length so that part would be much better with about 0.475" thread engagement.
Thx for the help - I'm sure many of you have been down this road already and know the solution!
ATI sent bolts with their 8" Treemaster converter but they have washers that make the head too thick and they then kiss the block. I called ATI and was told just not to use the washers but with the small hex head, it doesn't seem to cover as much clamp area as the more rounded-head 12-pt ARP bolts. These ATI bolts are, however, 5/8" long in underhead length so that part would be much better with about 0.475" thread engagement.
Thx for the help - I'm sure many of you have been down this road already and know the solution!