I run the lightest flywheel for a 12a in my 80 SA stockport. Its an 82 I think only weighs 23# versus 30# for the stock. I get some very minor vibrations from it but nothing too bothersome. Its been on there the last 4 or 5 years no problems.
I also talked to some folks that race 12as and this is a pretty common mod to do and still stay legal for the flywheel in some classes.
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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs
Project Fat Nikki Budget 12A rebuild Video setup < $30.00
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