Indy LAX heads

My IMM/RHS heads were advertised to flow 296 on the intake. About 10 years ago he offered a CNC program (intake only) for those and I got a set. They might be 4 angle seats? 62cc chambers, 2.02, 1.625. They went on my 500 hp @ 6,200 rpm 10.3:1 416" that would have done more with better parts selection. (more C.R., roller, better ported intake, bigger exhaust primaries, etc.)

When they were briefly available, I looked at the TFs but didn't pull the trigger because the only advantage that I could see over my current heads was the weight savings. Yeah, the TF are 'better' on the exhaust (at least on paper) and 'slightly better' at intake lifts over 6.00" than my RHS but not by all that much.

Based on available "advertised flow numbers" for both, (take that info for what it's worth, not trying to claim this or that or start any needless arguments!) I did a general comparison between the RHS Indy heads (CNC) and Trick Flow 190s. Both ad descriptions said flow was measured @ 28" of water. The .700" lift numbers are for the TFs. TF does not provide flow numbers for .550" and .650" intake lifts and .450", .550" exhaust lifts. The RHS heads did not advertise numbers over .650" lifts.

Just food for thought.

Intake
RHS TF
0.100 68 66
0.200 142 134
0.300 201 200
0.400 249 248
0.500 281 281
0.550 290
0.600 296 293
0.650 293
0.700 301

Exhaust
RHS TF
0.100 75 54
0.200 135 121
0.300 174 181
0.400 193 213
0.450 196
0.500 198 231
0.550 198
0.600 196 237
0.700 240