| NRS Special Thick Hex NutAdditional Information It is the same special thread nut that is used in several places on NRS fords. 3/8 x 16 tpi - 4 on exhaust and inlet clamp studs (N478)
- 4 on connecting rod screws (N452)
- 8 on crankcase to transmission frame bolts (N411)
- 6 on front end crankcase cover studs (N407)
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