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Originally Posted by dimefury
7,000rpm is fast but when i said that revs can replace displacement i was refering to jap. engines like the RB26 and 2jz inline sixes that can rev into the 8k - 9k rpms, with mods (some at over 10k), the 13b rotary is only a 1.3 but can put out huge power at insane revs. Even on down to inline fours, small 2 liter motors like the SR20 can be made to produce 400+ hp with boost and rpm.
if you can make the same power from a lighter engine, why would you use the heavier powerplant?
mustangjoe, your dream motor sounds awesome (but huge, what would a 5.0 I6 block weigh?)
power isn't everything......its about balance.
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Displacement has nothing to do with the engine's weight. A 427ci smallblock V8 is physically the same size as a 350ci smallblock, it's a smallblock. The LS7 is also all-aluminum and is physically smaller than an RB26, and weighs less as well. In almost every case an ohc engine is going to be physically larger and heavier than a comperable pushrod motor.