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yes, the 350 heads will bolt and work on the 283,,,but depending on what casting number and what CC they are they may lower you compression ratio. and yes, the 350 harmonic balancer will go on....expect you do not have the retainer bolt on the end of the 283 crank. anything bigger than what you have would scare me.hese heads are made FOR a 283 and will Yeild in the 10-10.5 to 1 compression. I would stay away from all late model heads personally. Your deal is NOT a Nightmare, Just run a Stock 283 Dampner..
The L31 Vortec head can be used on any SBC engine from 1955 through the end of Vortec production, with the exception of the Gen 2 LT1/LT4 engines used in some vehicles between 1992-'97. They are also not compatible with any of the current LS engines.