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04-06-2007, 10:48 PM
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Tapping for threaded plugs
I want to tap the three holes under the timing gear (oil passages). I went to measure the hole size before I started and they all are .510. The drill needed for a 1/4 pipe thread is .437 (7/16).
Can anyone confirm how do this? Just tap it anyway? I think I値l drill a .510 hole in a block and try the tap. If anyone has a link or info on this process can you post it? Thanks, s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
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