but not the ATI ones that come with their flexplate, the bolt head is too tall.

Thought I saw a stock style bolt that was longer than the OEM one at one point?

 

The bolt for flexplate to crank OR flexplate to convertor ?
What is the specs of the ATI bolts you speak of,thread dia,thread pitch,lenght under head,thickness(length) of head.

 

i bought ARPs for for my new TCI....found out they were to short.....got some new ARPs 5mm longer

 

GM made 2 flexplate bolts. One short for use with dish flexplate and no spacer. And one long for use with the spacer. The long ones for use with spacer are P/N #19257940

 

Flexplate to crank

The heads are too tall on these, and the factory threads are too short to use with ATI spacer/flexplate

 

What do you mean the head is too tall? What are they contacting, the converter?

 

Yes. We have measured .345" clearance on current design FTI 4L60e, not suure on their older converters what it was (they changed how they do their pilots) an older Circle D only have .260" I think it was clearly see ARM stamped into the converter itself when we took it apart LOL

 

flex to crank bolts or flex to converter bolts ?

 

Answerd above

 

used ARPs there also....no problem on the length