external or internal flexplate

[smokey1010]

I have a mark iv 454 engine. I don't know if I need a internal or external flexplate. The block# 14015445. Any help will be good. Thanks dave

[Vegas69]

Normally external, unless it was purposely built for an internal balance.

[deuce_454]

Normally external, unless it was purposely built for an internal balance.

what he said...but you can tell by looking at the crank if it has a counterweight on the flywheel end or not (and the old flywheel/flexplate will give it away too)