Could be the different shape as mention, plus the later rotors are lighter as well.
Other factors are the intake/exhaust stock port shapes and maybe plug
placement. Not sure on that last because they roughly look to be at the same
place on the housings.
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1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs
Project Fat Nikki Budget 12A rebuild Video setup < $30.00
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