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We also decided to increase the size of both the intake and exhaust valves. Note the difference between the stock 2.08-inch intake valve on the left and Summit Racing’s 2.19-inch valve. Their upgraded exhaust valve measures 1.88-inch (compared to 1.72, stock), and both are back-cut and swirl-polished. JMS cut the heads for larger seats and performed a three-angle valve job.