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all the iron magnum heads are in the 63-65cc range. 10:1 with pump gas is doable with tight quench. for a cam, are you looking at flat tappet or solid? flat tappet, if you want to stay below .525" of lift with the 1.6 rockers, I'd actually look at the MP .484" lift cam (ends up being .512 with the mag rockers) with the 114 LSA, installing it at 106-108 ICL.



Becareful with the lifts is that range makes sure you check retainer to guide clearance. I don't know about the mag RT or topline but if they are close to the stock Magnums It will be close.