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One One Way Bearing
Fits the HPI Trophy Truggy
Hpi Racing 1444 Underhead N Accessories to the modelerHpi Racing 1444 Underhead This is a genuine HPI Racing replacement underhead for compatible HPI nitro engines. The underhead sits between the cylinder head and the sleeve, forming the combustion chamber surface and helping transfer heat away from the top end. A damaged or worn underhead costs compression and consistency, so this factory spec part is the correct fix during a top end service. Genuine HPI Racing replacement part #1444 Engine underhead
