A stock ls1 head flows about 280 cfm @.600 lift, not .700 like most sbc heads are rated. A factory ls1 head with a port job will flow 330 cfm int/ 270 cfm exhaust @.600 lift!!! That is insane!! That is with a factory head!
Nobody top date has broken a stock LS1 crank from to much power, I am over 1000 hp and 800 ftlb on a stock crank, aluminum ls1 block, and heads! I made the switch from a tall deck 427" SBC and am still excited about the new motor!!
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Twin Turbo LS1 '71 Chevelle
1000 hp 93 octane street car
6 speed
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