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

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

Sent two e-mails.  Do they have hardened exhaust seats, have they been milled?  Are they a matching pair?   Where are you located, and how much are you asking?  Joe-JDC

JDC

no e-mail yet.     f_lydell@msn.com

e-mail sent.  Hopefully it gets through to you.  Thanks, Joe-JDC

JDC

Are you still looking for a set of G heads? I have a set with no valves.  Frank     f_lydell@msn.com

Sounds like this years’ Engine Masters Challenge (EMC).  The ‘Early Iron’ rules for this year specifies no pushrod tubes in the heads.  When porting the intake ports on those heads, getting into the pushrod holes is common thus necessitating the use of installed tubes in the pushrod holes to maximize the intake port sizes.

... hmmpf ...

These guys are getting serious. 312 FYB TUNNEL PORT. Who would have ever guessed?

THANX TED!

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Sounds like this years’ Engine Masters Challenge (EMC).  The ‘Early Iron’ rules for this year specifies no pushrod tubes in the heads.  When porting the intake ports on those heads, getting into the pushrod holes is common thus necessitating the use of installed tubes in the pushrod holes to maximize the intake port sizes.
 
Joe.  Went through some of the cores yesterday looking for 113’s and saw at least 4 big letter G heads.  Haven’t had a chance yet to determine if they are posted or not but if posted and in good condition, they should be candidates for what you need.  I’ll pull those heads from the stack later today and get a better look at them.  Will let you know.

Lorena, Texas (South of Waco)

I have both that are already ported, but have pushrod tubes.  New rules state no pushrod tubes.

... hmmpf ...

What type of racing and why tubes?

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Joe I will e mail you this evening about a set of g heads I have  Carl