No other modifications are required for these items to work effectively, you just bolt these in and drive.
If you have any other questions please do not hesitate to ask.
Kindest Regards,
Steve
Just wanted some info about the 1.9:1 high ratio roller rockers, 5/16" push rods (required on VY models). Do I need to buy any other modifications for these to work efficiently or can they be bought by themselves?
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