I am looking for another pair of ECZ-G iron heads that are posted.  Prefer stock or very close to stock with no porting, bare would be fine.  Or, a matching pair of 113 unmolested heads.  I have both that are already ported, but have pushrod tubes.  New rules state no pushrod tubes.


zip code 78250
PM:  joe dot d dot craine@gmail dot com
Joe-JDC


JDC

Re making the intake ports bigger & installation of pushrod tubes. I realize this is sometimes a result of trying to enlarge the ports to much or done on purpose for the same reasons.. I believe that John Mummert has likely spent more time in the past studying the "Y" ports than anyone that we know of..  If I may loosely refer to his published information from quite some time back. He indicated that making the ports larger on (for instance a G" head) was not necessary or generally desirable.. On a "G" a head, it's the shape of the port at the head bolt that's more important than the size or installation of tubes. If I may quote him. "A Y-block port can flow up to 235cfm without sleeving either the pushrod or headbolt bosses".  He indicated that velocity & shape were more important than size. He makes reference to what he calls "windows" where enlarging the ports will not result in better flow results. And to briefly sum up his article, he stated that the biggest impedence to more power at the time, was lack of effective flowing intake manifolds, hence his later designing of an aftermarket dual plane intake, which has proven very effective...    P.S.- just realized this post probably should be in racing?     


Paul

235 cfm will not come close to being competitive in the EMC.  I have several sets of heads that flow over 260 cfm, and I want a couple of back up heads ready just in case there is an unexpected problem with mine.  I always try to keep at least two in reserve of most every part of my engines.  Joe-JDC

JDC