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Some Frankenmotor Questions.

logic23
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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So i have all the stuff laying around the shop to do a 97 2.5 DOHC block, 96 2.2 SOHC heads Franken motor.

Ive read that you either use the subaru 2.5 DOHC gasket and add some holes for the coolant jacket or get the Cometic gasket.

The part that is unclear is what fuel are people using. Ive read a ton of threads and people are saying 85 is fine and others say that you HAVE to use 91.  Can anyone with Frankenmotor experience please chime in here.  Thanks

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