Port/Vol
Intake / Exhaust 170/62
Combust Chamber Volume 58
.400"
Intake / Exhaust 187/139
74.33%
384.7 hp
500"
Intake / Exhaust
190/145
76.32%
390.9 hp
From Stan Weiss http://users.erols.com/srweiss/tablehdc.htm#Chevy
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