S&S 136" M8 Engines MK136Race only 136" engine specs: Cylinder Heads High flow cylinder heads with premium seats, guides, valves, springs, and seals +1mm oversized intake and exhaust valves Valves are . 030" longer than stock for improved valvetrain geometry 550 Gear drive camshaft . 605" max lift valve springs High strength alloy used in cylinder head casting, improved strength at high temperatures Enlarged cooling passage around the exhaust seats S&S Exclusive breather
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