Thoughts on lightened flywheels and clutch disks, For performance motor Options

[Boomingbeetle]

I have a 2270 motor that I will eventually be putting into my '71 with a sideshift tranny, once I get some dress-up and parts collected. It does not currently have a flywheel, clutch, or pressure plate.

1. Is there a benefit to finding a lightened flywheel if the motor has lighter internals?

2. I assume I should use a 6-spring clutch disk or an aftermarket performance material, but maybe this isn't necessary for a 150-HP/TQ motor? Ditto for the pressure plate.

[Tbrown4x4]

I agree with Stu, and wanted to add something. In my travels, I've always looked at the flywheel as an energy storage device. Think of a single cylinder engine: (Especially the "Hit and Miss" vintage engines at the fair.)
You get a power stroke that turns the flywheel, then the flywheel keeps things turning until the next power stroke.

In an automobile, the energy stored in the flywheel helps with smooth starts and easier shifting. (The RPM's don't drop as much when you push in the clutch.)

Lightening reduces the flywheel's capacity to store energy, but it also reduces the work the engine needs to do to spin it up. This makes for a very "revvy" engine that may feel faster, but does not actually increase HP.

If I was road racing or autocrossing, I might consider a lighter flywheel. But for a street car, I wouldn't bother.

Balancing the rotating assembly is money better spent.