Here are some specs for the Intake and Exhaust runner sizes for various SBC and BBC heads. So now when someone does a search they will have all the numbers at their finger tips.
Enjoy !!!!!!!


CHEVY
Head # Intake Exhaust
C.C's C.C's

26 323.0 127.0
41X 165.0 65.0
49 255.0 119.0
58 241.0 86.0
63 256.0 114.0
74 308.0 122.0
77 302.0 122.0
81 167.0 64.0
83SB 161.0 62.0
83 243.0 110.0
113 161.0 60.0
128 161.0 62.0
147 191.0 163.0
186 161.0 65.0
188 323.0 127.0
215 256.0 114.0
236 225.0 116.0
241 255.0 116.0
245 *8 175.0 68.0
258 68.0 72.0
280 256.0 114.0
290SB 142.0 59.0
290 *22 175.0 62.0
290 256.0 114.0
290*3 262.0 115.0
291 327.0 122.0
291SB 161.0 65.0
293 144.0 58.0
327 73.0 53.0
340 320.0 120.0
374 *8 175.0 68.0
401 320.0 120.0
416 165.0 59.0
441 161.0 65.0
450 168.0 60.0
461X 172.0 64.0
461 161.0 62.0
462 161.0 65.0
487 161.0 65.0
492 161.0 62.0
493 161.0 65.0
503 69.0 51.0
520 140.0 60.0
523 120.0 55.0
545 165.0 65.0
583 234.0 130.0
620 123.0 58.0
624 161.0 62.0
651 117.0 58.0
781 256.0 114.0
806,853 210.0 80.0
813 138.0 72.0
820 255.0 114.0
840 326.0 120.0
842 320.0 120.0
858 157.0 53.0
882 160.0 60.0
883 118.0 85.0
896 140.0 60.0
990 323.0 127.0
993 159.0 64.0
997 161.0 65.0
2187 188.0 61.0


Notes

3 SMALL PLUG HEAD
8 Late model aluminum GM head.
22 Cast Iron LT1 Head (Impala, Roadmaster, etc.)

 

volume cylinder <-- key words