1929 - TR/OBR 4 Bolt Billet Piston Port Crankcase We've had quite a few

<span>We've had quite a few questions on the power difference between our case and a stock Zenoah case

have more mid range power and rev higher

If ordering signature series porting please email us if you would like custom tuning

Enlarged and resurfaced exhaust port<br />4

Modified piston

1929 - TR/OBR 4 Bolt Billet Piston Port Crankcase <span>We've had quite a few<p>Dyno results are in.&nbsp;<span>We've had quite a few questions on the power difference between our case and a stock Zenoah case. Testing was done on our prostock g290rc we've been developing. We're seeing by just swapping to the TR OBR billet piston port case more power< span><span class="text_exposed_show">&nbsp; all the way across the board. 0. 2 ft lbs of torque and HP, broader powerband, +1500 rpm's and quicker crankcase temperature