I just put 215/60's on my GTO and it turns 2400rpm at 60mph. I used to run 255/60 tires and it was less obviously, but it's not crazy rpm's. How low do you want the RPM? Mine is a 4 speed Muncie + 3.5 rear ratio.
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'71 Holden HQ Monaro - 3850lbs race weight, 400c/i - 11.4 @ 120
'66 Pontiac GTO - 389, 4 speed street cruiser
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