Reply to "Edelbrock 351C Head Flow Numbers"

Rodger, here is the Aussie cast iron 2V head data you're looking for

..............Aussie 2V..Aussie 2V
valve lift...as cast.....ported & 4V valves

0.100"......59/44.......79/75
0.200"......112/79.....154/109
0.300"......156/109....206/156
0.400"......178/130....231/180
0.500"......187/153....244/200
0.550"......188/164....250/207

AND, here is the data for the 2V alloy heads from Edelbrock's Australian competitors, AFD & CHI

valve lift...AFD 2V.....CHI 2V

0.100"......64/55.......77/64
0.200"......122/108....147/114
0.300"......186/151....207/153
0.400"......239/185....255/185
0.500"......272/205....286/200
0.550"......286/211....296/208
0.600"......290/216....300/214
0.650"......297/218......N/A


CHI also manufactures 2 versions of the 3V cylinder head, and a 4V cylinder head. The intake port of the 3V head is a 2V size port raised about 3/8". The 2 versions of the 3V head differ in the cross sectional area of their intake ports, and therefore in the volume of the intake ports; the smaller port being 185cc in volume, the larger port being 218cc in volume. CHI's 4V head has 3V size intake ports that are flared open to mate with standard 4V intake manifolds. One last mention is that AFD also manufactures a "stuffed" intake port 4V head, stuffed referring to the fact that the floor of the intake port is raised in relation to a standard 4V port.

air flow data does not indicate 100% which head would make the most power for your application, I realize there is little else to base a purchasing decision on, but the air flow data does not tell the whole story. Recommendations from a trusted engine builder experienced with these heads would be the best help in making a buying decision. In general, Edelbrock has a reputation for producing heads that are NOT great performers out of the box, but normally their heads can be made competitive with porting. I have not yet read any feedback on how well the Edelbrock 351C 2V heads perform after a good porting job. Since the Australian heads are competitively priced with Edelbrock, either of them would represent a better value for the money, as they are better performers out of the box.

Your friend on the DTBB, George