No, the 87 cc aluminum heads would increase the compression a little bit, may to around 8.8-ish, but the aluminum head needs another 0.5 increase of compression to be comparable to the iron head in efficiency. They will certainly flow much better, but I think they are overkill on an engine like yours and you can spend the money on better things...cam & lifters, better exhaust, and improving the intake system...and still have money in your pocket.
Dennis
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