> The CHi 3Vs are killer heads. These are the heads that won this year's Engine
> Master Challenge. Everyone I talk to says they flow excellent right out of
> the box. Some people are seeing 335 and 340 at .700 out off the box. Kaase
> was able to get his to flow 350+. Kaase emailed me a few weeks back and said
> he rebuilt his winning engine and it then made 712HP using these heads on 92
> pump gas (12.5:1 compression). These really are very good heads.
>
http://www.chiheads.com/heads_02.html
Andy, CHI makes several versions of the heads (185cc, 218cc 3V's, CNC-ported
3V's). I think you'll find the 340 @ 0.7" numbers you are quoting are for
the CNC-ported version of the 3V head. The heads Richard Holdener flowed
at Westech for the MM&FF article were the CNC-ported versions. They were
the best heads that were legal for the Engine Master's Competition but there
are other heads that were not legal for the EMC that may be better in other
applications. The old C302B's (or the still in production Brodix BF300-series
replicas) have more potential, primarily due to the raised ports. Versus the
218cc 3V's, my 217cc C302B's have better flow across the lift range. The
new Ford Motorsport D3 looks a lot like a raised port version of the already
raised port C302B's (the canted valve angle is back). I've not had them on
the flow bench yet but they are said to be capable of over 400 CFM intake
flow. All of these heads require compatible intake manifolds. The CHI can
usually get by with standard 351C 4V headers but the others require custom
headers. The C302B's have been around long enough that there are off-the-shelf
headers available for certain applications like my Pantera.
Dan Jones