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By oldcarmark - Last Month
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I am rebuilding my 292. I understand it is a good Idea to run a Tap through all the Head Bolt Threads in Block to make sure Torque is correct. I have a Set of regular Taps. What is the difference in a "Bottoming Tap". Also when assembling do the Head Bolts go in Dry or Light Oil on Threads? Thanks!..
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By paul2748 - Last Month
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A regular tap has a sort of a pointy end to it. The bottoming tap has an end that is more squared off so the full cutting parts can go in deeper. A bottoming tap is usually used in a blind hole.
In the case of threads that take a lot of torque like head bolts, it is better to use a thread chaser rather than a regular or bottom tap. Use of a tap may cut the metal lessening the strength of the threads, while the thread chaser just cleans.
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By oldcarmark - Last Month
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I haven't heard that Term "Thread Chaser" before. Another Type of Tap? Bolts for Heads should be assembled Dry? Thanks
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By 55blacktie - Last Month
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Paul is correct. A "Thread Chaser" is like a tap but more precise to prevent damage to existing threads. They are also more expensive, but a $30 thread chaser is cheap insurance.
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By oldcarmark - Last Month
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OK Got it. Thanks!
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By Robs36Ford - Last Month
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Here is a good video of thread chaser:
https://www.youtube.com/watch?v=U7_9RSV7jTI&t=47s
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By Marc - Last Month
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Always use a light oil on the threads for a more consistent and accurate torque.
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