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Porting the head
https://www.slantsix.org/forum/viewtopic.php?t=20854		 Page 1 of 1
Author:  BigBlockBanjo [ Thu Nov 23, 2006 3:08 pm ]
Post subject:  Porting the head
Got my head back, did the guides, cut & lapped the seats.
Looking at the flow path, and decided that a 125 Oliver tractor has better ports! There's a 1/4in shelf on the inside of the port, and casting marks everywhere. I'm really thinking about putting a grinder to it, I know I can't hurt it. :? Just smooth it out some.....any advice?
Author:  Ron Parker [ Thu Nov 23, 2006 3:13 pm ]
Post subject: 
The head is where you can make a huge gain in performance. Thanks Ron Parker :D












It Aint Over Until I Win
Author:  Bren67Cuda904 [ Thu Nov 23, 2006 3:46 pm ]
Post subject: 
becareful about taking out the shelf. The shelf may help the flow.
Author:  Joshie225 [ Thu Nov 23, 2006 4:07 pm ]
Post subject: 
Hmm, what year head is yours? My '73 head has a distinct parting line in the ports, but the rest is pretty good. Even the guides are well centered in the bosses. I think the port form is pretty decent myself. My current /6 head project is here: http://slantsix.org/forum/viewtopic.php?t=20588
Author:  BigBlockBanjo [ Thu Nov 23, 2006 7:54 pm ]
Post subject: 
My head is a '72
Trust me, this is not helping flow. It looks like they cast the port too small, and machined/drilled it out to fit the valve seat. I wish I could put some pics on here, to see if this is common. Intake is worse. It looks like the port is quite a bit bigger than the valve seat flow area. Oh well, "I can fix it!" :D
Author:  MitchB [ Thu Nov 23, 2006 8:13 pm ]
Post subject: 
I had my head off to repair a burnt exhaust valve and seat. I had the head pocket ported to blend the seats to the ports. There was a lot of material hanging in the ports just as you describe.

Mitch
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