Hi, Have three cylinder Heads from a 226 engines. Want to mill the head and need info on stock cc's to make sure it was not already done. Also need info on how much to take off! When I checked one of the chambers I ended up with 97.5 cc's (Burette and colored alcohol method). Do not know factory spec on head. Head I.d's as follows 1948 F-1 pickup 7HA 6050-C2 . 1950 pass. (from Police car 1HA 6050 1HA 6050 FB). Third head same as 50 engine. All appear to be the same. Any help would be appreciated Thanks Don.
Will dig around this weekend in service bulletins. Ones I have here that are new enough only has V engine CC's, older one only covers the older G version of the engine. Might also be in a shop manual.
I cc'ed the other two heads I have and they all come up around 95cc's. I am going to assume that is the stock chamber size. I am ready to send it out to have it milled. Any one know how much to remove? Have seen here on the HAMB site from .040-.080 Thanks Don.
If you go to the vintage section at fordsix.com, look for some posts on this topic. Here is a quote from "flatford6" in response to me (mainline331) asking this same question on the board: ..."Sixty thousandths mill from stock will give you about 1 point of compression gain. This assumes that the head hasn't been milled at some time in it's 59 year past. The thickest head measurement from the top of the head bolt bosses to the combustion chamber side that I have found is 1.890 inches. If your measurement is less, the head may have already been milled some..." That said, I think that I took about .060 off of mine, no problem with detonation or clearance with my "high lift" .365 cam... -James
Would it not be safer to mock up the assy with some crumpled aluminum foil over a piston and over a valve; turn the engine over to compress the foil; remove and measure then determine how much can be removed to maintain .050" over each?
The Jalopy Journal
