Engine - Cylinder Heads - Aluminum Cylinder Head, 15 degree

From GM Performance - This new 15 degree aluminum cylinder head is designed for small displacement racing engines that run competition eliminator. This head is identical to the 18 degree head, except the head is rolled by maching the deck surface at a 2 degree angle and thereby removing more material from the exhaust side of the head than the intake side. The valve guide holes are also tipped 1 degree in the casting to produce a total of 3 degree in valve angle. Smaller combustion chambers are the main advantage. The head does not have valve seats or valve guides and has 35 o 37cc chambers instead of 42 to 44 cc in the 18 degree head. Technical Note: P/N 24502615 is made from the same casting (101343633) as the 10134364. This is not a CNC ported cylinder head.