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!..

  

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.

54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

I haven't heard that Term "Thread Chaser" before. Another Type of Tap?  Bolts for Heads should be assembled Dry? Thanks 

  

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. 

OK Got it. Thanks!

  

Here is a good video of thread chaser:

https://www.youtube.com/watch?v=U7_9RSV7jTI&t=47s


1936 Ford 3W Coupe : 56 T-Bird 312, 47 Packard 3 speed, 40 juice brakes.
1968 Merc Cyclone FB GT 390, Getting a better front clip!
1977 Ford F-250 Supercab RWD Explorer Long box.
1976 Chev Camaro RS LT
Future rebuild : 1949 Ford F-1

Always use a light oil on the threads for a more consistent and accurate torque.