Quote:
Originally Posted by Purdy Swoft
I would also check the water jacket on the deck of the block .
The crack could have been caused from overheating . I would also look at timing and points gap as a possible cause . Points gap can effect timing . Too little gap hurts performance as it retards timing . Retarded timing at the rotor tip or over use of the spark causes a lot of overheating that often gets blamed on other possibilities .
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"Points gap can affect timing." Maybe a little. In reality, timing is set by that there lever on the left side of the steering column, not points gap! "Too little gap" can be compensated for by pulling the timing lever down an extra click or two. Presto! Timing is correct again! And, if you set initial (or base) timing by factory procedure and keep the point gap correct, it will not change until the timing or distributor gears wear out.