Sheet Metal Intake on a 427cid Friday, January 26, 2007 Jim Hall Results on an iron block 427cid LS1. The engine featured the new L92 heads, with the TPiS sheet metal intake, and TPiS 90mm throttlebody. The engine produced 663hp at 6900 rpm and a max torque of 556 ft/lbs at 5900 rpm.
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