Indy 325 CNC heads flow 370 at .700 lift with the 2.18 intakes.

I had Jim LaRoy up in Challis, ID do the valve job on them and a little touch up to unshroud the chambers to the 4.5 bore. Here is how my 325's flow with the POS Indy valve job (before) and a good valve job. Note the ex/in flow ratio is pretty constant at around 82% across the lift range.

lift............before..........after

.100..........69/61.........80/68
.200........144/123......158/134
.300........215/172......226/183
.400........274/217......277/229
.500........321/251......320/265
.600........346/280......349/290
.700........362/301......368/307
.800........372/317......372/327


My heads have the 2.18 intakes. Jim experimented with dropping a 2.25 valve in without changing the seat. These are the results (I think he used a different cylinder as the before numbers are a little different):

Lift...........before..........after

.100...........80............91 cfm
.200..........158..........177 cfm
.300..........227..........239 cfm
.400..........281..........292 cfm
.500..........329..........335 cfm
.600..........354..........354 cfm

These are on a 540 (4.500 x 4.250) with a Indy R2 cam and 14-1. Not dyno'd yet or run down the track. I am hoping to get in the neighborhood of 800 HP.