Cfm @28 in.
lift in ex
400 217.9 145
450 231 154.6
500 243.5 161.6
550 252.9 165.3
600 262.8 167.8
650 266.3 167.3
700 263.7
Swirl was only fair but did improve quite rapidly beyond .400 lift.
In theory this flow capacity would support about 550 bhp. The head was not modified/ported beyond manifold matching.
Valve sizes were 2.01/1.6.
lift in ex
400 217.9 145
450 231 154.6
500 243.5 161.6
550 252.9 165.3
600 262.8 167.8
650 266.3 167.3
700 263.7
Swirl was only fair but did improve quite rapidly beyond .400 lift.
In theory this flow capacity would support about 550 bhp. The head was not modified/ported beyond manifold matching.
Valve sizes were 2.01/1.6.