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V8 CYLINDER ENGINE Reclaiming cylinder head threads Damaged or stripped threads in the cylinder head can be salvaged by fitting Helicoils as follows: A - These holes may be drilled 0.3906 in. x 0.937 + 0.040 in. deep. Tapped with Helicoil Tap No. 6 CPB or 6CS x 0.875 in. (min.) deep UNC insert). Holes B - These eight holes may be drilled 0.3906 in. dia. x + 0.040 in. deep. Tapped with Helicoil Tap No. 6 CBB 0.749 in. (min.) deep UNC insert). Holes C - These four holes may be drilled 0.3906 in. dia. x 0.937 + 0.040 in. deep. Tapped with Helicoil Tap No. 6 CPB or 6CS x 0.875 in. (min.) deep U N C 1 insert). Holes D - These four holes may be drilled 0.261 in. dia. x 0.675 + 0.040 in. deep. Tapped with Helicoil Tap No. 4CPB or 4CS x 0.625 in. (min.) deep UNC 1 insert). Holes E - These six holes be drilled 0.3906 in. dia. x 0.937 0.040 i n . deep. Tapped with Hclicoil Tap No. 6 CPR or x 0.875 i n . (min.) deep UNC insert). NOTE: Right-hand cylinder head illustrated. F Exhaust manifold face G Inlet manifold face H Front face I Rear face J Front of engine F A \ I I ST 799M G 99 |