The 4200 never came with a manual trans and the i5/i4s have a different crank bolt pattern.

could the i5/i4 flywheel be drilled for the i6 bolt pattern, what other options would you recommend?

thanks.

The biggest issue to getting flywheels is a lack for NA supply for the ring gear.

My suggestion - start calling RAM clutches and asking for a flywheel - demand might spur more interest from the aftermarket. Ram currently does not offer one but I have spoken to then earlier this year. Money as in orders talks. I sent them the flywheel design so they have the info to make it.

The I4/5 have a different pilot and flange register - so not an easy mod.

http://www.emtechmotorsports.com makes an adapter to use the standard sbc/ls bolt pattern bell housing, a blank flywheel core may not be too hard to pick up and have it machined to fit the crank.

if I use a bell with holes for a starter mount I feel this could be an option, tho I'm probably missing something.