706's or 243's on a 5.3?
#12
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As others have already said the only difference between the heads is the intake runner size and the intake valve size. Therefore IMO if you plan on doing ANY other modifications to the motor (larger cam, fi, n2o, etc) you are ahead by starting with a set of 243's. If what you have stated is all the modifications you will ever do to that motor then stick with the 706's.
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