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I have a 69 Mustang I'm putting together, I'm wondering which Flywheel to use.
I'm torn between a McLeod Steel 25lb Flywheel or the Ford Performance 30lb Billet Steel Flywheel (25lbs verses 30lbs)
Its a 400hp 412 torque engine with a 4 speed wide ratio top loader and a 391 traction lock rear end. I understand the 351w typically has decent bottom end torque
which makes me lean towards the lighter weight flywheel.
I will be doing all street driving but want be quick at the light and don't mind being pushed back in my seat a little at acceleration
Is the heaver 30lb flywheel to much and just adds unnecessary weight or would the 25lb have better drivability.
Appreciate your feedback
 

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I have an aluminum flywheel on my 289 with 3.55 gears and it works great. A heavy flywheel will store more energy which helps at launch, but once moving it will accelerate more slowly. In theory the heavier flywheel will be more forgiving for smooth feeling shifts, but I have not noticed an issue with jerky shifts.

If I were drag racing I would want a heavy flywheel. For quicker reving, light weight is the ticket.
 
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