The left flywheel pictured is the sooner Silvertop style though the proper is the lightened Blacktop. Regardless that the Blacktop head encompasses a more open up combustion chamber (see “Head combustion- chambers”) it however has a better static compression ratio (see “compression ratio”), this is purely due to piston layout. https://4age20vitbs02345.dsiblogger.com/72729192/5-essential-elements-for-4age-engine-for-sale