Drilling steam holes in smallblock Chevy heads
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4- To drill the remaining 3 holes in the head use a starter bit first then switch to a 1/8 inch drill bit. This will make it easier to get the holes started on angle without drill deflection. The maximum size for these holes are .187 or 3/16 inch. | 4- To drill the remaining 3 holes in the head use a starter bit first then switch to a 1/8 inch drill bit. This will make it easier to get the holes started on angle without drill deflection. The maximum size for these holes are .187 or 3/16 inch. | ||
5- clean off heads with brack clean or parts cleaner. use a new head gasket to make sure holes are correct. | 5- clean off heads with brack clean or parts cleaner. use a new head gasket to make sure holes are correct. | ||
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