IMHO the 1 3/4 will work just fine for motor and some NOS. once you get to a big shot or a big cube motor then worry about the bigger headers. most the time a smaller motor you wont turn really really hard so its better to have the low end to use the most of what you got. i went to 1 7/8 headers and didnt notice much change at all even on the 250 shot. but i dont know much about it since i have a ford but Greg knows so just do as "THE MAN" on radials says
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