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These 3/8" screw-in rocker studs are used on all late model LT1, LT4 and any head not using a pushrod guideplate. This kit includes 16 of P/N 12552126 studs and use this P/N 12552126 for single service. The lower thread section of this screw is 7/16".
Note: These studs will not work with guideplates, because the tall hex will interfere with the bottom of the rocker arm pivot area when raised with a guideplate.These studs can be used on any sbc head tapped for them as long as self aligning rocker arms are used.
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