These are some pictures of the heads as I received them. The heads
are done and sitting at the shop; I will take some pictures of them
with the fresh machining and assembly soon. I paid $250
for these heads; I imagine they were probably $5,000 heads (at least)
originally. They were CNC ported and hand finished by
Chapman Racing Heads.
However cheap the heads were, I made up for it in labor to get them right! They were off of two different motors, and not a single measurement was the same from one to the other. I have at least 40 hours into machine work and making jigs for the heads; I owe a HUGE thanks to Mark Hedrick at Horsepower by Hedrick for helping me get these right.
I made a custom measurement jig to allow measuring valve seat height relative to the deck; one head was .020" higher than the other. I also made adapter plates to allow mounting the heads for surfacing since the angled intake bolt holes wouldn't allow mounting to the shop tooling.
We installed all new exhaust guides and one new intake guide, after first turning the locators on the lathe to match the originals. We cut a fresh 3 angle valve job in the seats on the Serdi machine and equalized all seat heights to within .002". We surfaced both heads (one by .003", the other by .023" to match), machined the valve pockets almost .100" deeper in one head to allow for a 2.000" installed spring height, and generally spent a ridiculous amount of time getting them right...and people wonder why race quality machine work is expensive!
Here's a pic of the heads waiting to go back to the shop for assembly:
