hford: Success! I finally found a 153 tooth listing! The medium duty trucks used a 153 tooth, 13.735" OD flywheel for a few years. Used mostly on the 330/352 it seems. Not a good choice for a 427/428, as you would have to use the old 352 bellhousing, starter etc..My suggestion--a new scattershield with a new steel flywheel (McLeod/Lakewood sell both). Safety first!!
