thefrenchowl wrote:wz507,
You have all my blessings in your holly grail search for improved flow from what the factory, Jerry Branch, Axtell, Len Andres and a few others achieved in 17 years of trying while discarding hundred of fooked heads and fooked barrels...
It's like trying 500 years from Galileo to prove to yourself that indeed, the earth is not the centre of the universe. The same ground has been covered umpteen times since
WHY????
Get a 1969 race instruction booklet and follow the #7 head drawings for the various carvings, not forgetting the cylinders as well, loads more work there than on the blinking heads.
Patrick
Patrick,
Evidently you saw the word “airflow” and jumped to the incorrect conclusion that some holy grail airflow pilgrimage was underway, which could not be further from the truth.
I have no KR valves or cylinders or heads. I am a hobbyist with access to a flow bench. I am building a nearly stock 56 KHK. I have 3 heads at my disposal - a stock K, a machine spotted head (KK?) and a fully machine KHK head. After new valve seats are installed in the cylinder and a valve job is done I simply want to put the different heads on the cylinder and quantify airflow to see if the different heads flow differently. I already know the port is large relative to OHV applications and therefore port speed should be relatively low. But that evidently is what works on the K engine design.
Since I have the -52R combustion chamber casting, thought I’d use this to make an epoxy head with the early R combustion chamber to compare this head with the other 3, which is much easier than trying to sculpt it from a stock chamber casting.
Regarding your question “WHY?” For all the reasons above and simply because I’m curious and have never seen a single airflow volume or port speed number published for any K engine (K or KR), so if doing it myself is the only way to see the numbers, then why not? If you or anybody has such information and could direct me to that information source I’d be grateful.
Regarding the 1969 instruction booklet, is the information there different or more in-depth than the circa 1959 Competition Racer manual that shows the #7 head drawings with shelf location and valve to head clearance?