bjherron

I am installing a zz454 big block in my nova with a 4L80E transmission. I finally have collected all of the pieces and I noticed that the 6-bolt pattern in the ZZ454 flexplate is staggered and the torque converter bolt pattern is not.

Only 3 of the 6 torque converter bolts line up to the flexplate. Is this normal? Did they do a staggered pattern in the flexplate so it would support only 3 bolts from both torque converter patterns?

Is 3 bolts OK? It's a stock ZZ454 for now, rated ~ 460HP. May get some upgrades later.

bjherron

see in the comments below, they say only 3 bolts should be used when installing a 4L80e

http://www.jegs.com/i/Chevrolet-Perf...85034/10002/-1

I can't find an externally balanced flexplate that has all 6 in the right spot.

BMR Sales2

iTrader: (40)

This is correct. That flexplate has both the large (th400/4l80) pattern and small (th350/700r4/4l60) pattern. You only need to use the 3 that line up with your converter