A small # of cc chamber makes more compression. Naturally asporated this is what you want. Nos or forced induction use the larger cc heads. If you are planning a purchase and will bolt them on a stock motor, get the 58cc, as long as you do not plan on forcing induction. For up to 150hp shot of NOS the 58cc will be OK
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88workcar
1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft
Rice Hater # 42
To be old and wise, You must first be young and stupid  I'm somewhere in tthe middle.
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