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The Terminator
Engine/Tuning
Cylinder Heads
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<blockquote data-quote="Ironhand" data-source="post: 11147887" data-attributes="member: 32955"><p>It depends on setup.</p><p></p><p>Bumping compression say from 8.5:1 to 10:1 will only increase engine efficiency by about 4.3%. Thats a rough number tho. And boost can be dialed up or down cheaper then pistons. Yes they may only cost x amount, but labor time, and any other upgrades cost alot of money compared to just raising boost or switching blowers. So technically no, the cost per horsepower will not be an advantage because a good solid built shortblock will still cost you over 4k plus the labor time to install it if you dont do it yourself.</p><p></p><p>Also a fair amount of power from worked cylinder heads comes from the pistons being increased in size and helping to unshroud the valves. But doing a .20 over bore adds even more expense or using a BOSS block adds to that expense which inturn bring the horsepower per dollar rate down compared to a blower or pulley swap.</p></blockquote><p></p>
[QUOTE="Ironhand, post: 11147887, member: 32955"] It depends on setup. Bumping compression say from 8.5:1 to 10:1 will only increase engine efficiency by about 4.3%. Thats a rough number tho. And boost can be dialed up or down cheaper then pistons. Yes they may only cost x amount, but labor time, and any other upgrades cost alot of money compared to just raising boost or switching blowers. So technically no, the cost per horsepower will not be an advantage because a good solid built shortblock will still cost you over 4k plus the labor time to install it if you dont do it yourself. Also a fair amount of power from worked cylinder heads comes from the pistons being increased in size and helping to unshroud the valves. But doing a .20 over bore adds even more expense or using a BOSS block adds to that expense which inturn bring the horsepower per dollar rate down compared to a blower or pulley swap. [/QUOTE]
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