They have better flow numbers that L-98/ZZ4 heads and would be an up grade. If I remember correctly they are 170cc intake ports. Stock heads have a valve lift limit due to retainer to guide clearance. Scoggin Dickey machines the guides on the ones they sell which allows .500" lift. Search Chevy High Performance mag and others they have dynoed and flow tested these alot. Great for a daily driver 350. Best production iron head GM ever made.
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Ted Rea
"Don't drive FASTER than your guardian angel can fly"
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