I have a 120ST, if I cam up to a TM 662-2 or TW408-6 do I need to change valve springs? I plan changing lifters to S&S and most likely a S&S or P3R flywheel. Also can I use a cometic .03 gasket to get compression bump? Would that net 10.8:1 from the stock 10.5:1?
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2016 FLTRXS 120ST, SE Elite Heavy Breather, D&D Boss Boarzilla, Bandit Sportsman Clutch, Factory47 16" Malo and Arc Audio MPAC 6.