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how many cubic inches can a set of small block heads that flow 390 cfm @800 lift support. don't want to mismatch the engine to much. thanks ;)
 

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How high do you want to turn it? My 447 with SB2's flow 398 and peak HP is at 7500 with roughly 800 lift, 269/[email protected] A cam change would raise it, but we didn't want to turn it too high. You want to spin it higher go with a 406 to 421.
 
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