Many other changes to those heads between those two pics. The last revision before the new headers was to move the exhaust valve guide/valve over to make more room for the largest intake valve we could get in that small chamber. The entire exhaust port was then reshaped for a much smaller valve. All the work was done by Slawko of course. But good catch FWIW these headers were done by REF in Kingman, Greg and the guys have YEARS of experience with everything from bracket stuff to comp. We hold the shop record for the longest amount of time a car has spent in the shop getting headers made. It was there 4.5 days. As Jay pointed out most stuff is in at breakfast and done by lunch or shortly there after.