Quote:
Originally Posted by 1929
So, if you have a 6-1 Head, you should stay at half, if you are cruising at 50 or below?
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Follow what others say. I have a BF h.comp head and one needs to listen and "feel" the motor for the varying speeds and hills, etc. At 50, one can be at about 1/2 down or a little more, but when approaching grades, the spark rod may go up to 1/4 or whatever the engine tells you. Some cars may be more sensitive than others especially on a tight engine, and you may be adjusting the spark rod often to avoid bearing pounding and pinging.