Stock RHS/Indy LAX head 1.94 intake/1.60 exhaust no tube......
.100 57/52
.200 124/105
.300 184/143
.400 230/163
.500 255/167
.600 257/167
Ported RHS/Indy LAX head 1.94 intake/1.625 exhaust w/1-3/4" tube......
.100 NA/NA
.200 144/131
.300 191/173
.400 234/201
.500 264/222
.600 280/236
.700 283/238
462 HP on a big bore 292ci/273
Ported RHS/Indy LAX head (8 cylinder avg.) 2.055 intake/1.625 exhaust w/1-3/4" tube......
.100 NA/NA
.200 145/124
.300 206/176
.400 253/214
.450 275/226
.500 290/236
.550 301/242
.600 303/248
.650 297/253
With these heads a 360/424 single 4-bbl stroker made 474 LB-FT @ 3,000 rpm, 574 LB-FT @ 5,100 rpm and 629 HP @ 6,400 rpm. Solid roller 258/260 @ .050, .660/.668 w/1.6 rockers, 110 LSA, 107 ICL and 91 octane pump gas from the Stinker Station.