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Originally Posted by moto-mike
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Found this with regard to the Crawford Power blocks wouldn't this apply also to a full aluminum manifold vs plastic? So is the gain a "dyno" only gain ie real world hood down driving would cause heat soak and higher IAT?
Kodename47 has it right on the money, except for the fact that we actually found the billet power blocks to cause a fair to large amount of heat soak. We tested an NA car with them and the car physically lost power every single pull with the blocks on. We took the blocks off, adjusted and then did repeated pulls again, in which the car was consistent in power every time. We believe this to be due to their choice in material. The factory definitely chose plastic for the intake manifold material for a good reason, and that's not limited to cost.