Here are a couple of pics I saw on FSP of a cut-away 240 head.

 

Remember I said I took more off the guide boss than I wanted or needed? Make that more than I should have. It cracked. I guess better now than later when the chunk that broke off would have dropped into the cylinder. Oy. Gonna have to get it drilled out and an insert installed.

I didn't take nearly as much off the other five but a couple of them look either poorly cast or cracked as well. Depending on what the shop quotes me for one I may just have them knock out all six to be on the safe side.

 

Couple more shots of an intake port/bowl.





Since one of the guide bosses cracked I figured I might as well grind the crap out of all the rest and get them all replaced.

Should have the exhaust ports all done and the chambers deshrouded/polished this weekend. Once I get the new guides and valves in hand it's off to the shop to have the guides installed and a 3-angle valve job done. Plus a backcut on the valves if they don't come that way and drilled/tapped for studs.

 

I think those photos are sexy as hell!!

 

I have not read through all 3 pages of replies, so maybe this has already be asked. If you are cutting the pockets and seats for larger valves, isn't there a good chance that you will cut through the hardened material on the exhaust ports into non-hardened material? The flame hardening done to the exhaust ports is probably no more than a surface treatment. You may need to have hardened seats installed for the larger exhaust valves.

 

Pretty much done with the porting and polishing for now. More pics...





Exhaust port







Intake port





What with tax day coming up it'll be a couple of weeks before I order the guides and new valves. Once those are in hand I'll drop everything at the shop to have the guides installed, a 3-angle valve job (along with a back cut on the valves if they don't come that way), and the rocker stud bosses drilled and tapped. Then just for fun I'll get them flow tested. Stay tuned!

 

You're welcome. But remember, "we want photos."

 

When I get finished unpacking and situated I plan to port my 240 head, I don't think I'll take it as far as you did though. I can't afford to spend more money then I have to so I think i'll be more conservative with removing the extra material, this old head has some pretty rough spots in the casting.
I am curious to know if theres anyway to tell by looking at it, if its had hardened seats installed. These valve guides have no play to them what so ever and the valve seals are still soft. The engine was running although extremely rich when I pulled it from the 64 so I am thinking someone may have had it rebuilt. I can even see tool marks inside a few of the runners but that may just be because of its vintage?

 

Bringing this back from the grave, I finally had the head flow tested.



The fella at the shop said it flowed pretty good considering what it is and it's for. He noted the numbers didn't go down at max lift (which apparently means too much material removed in the wrong spots causing the air to eddy) but kept getting a little better. So at least I didn't make things worse.

It's always apples to oranges looking at numbers from different benches and different operators and corrections so I take this with a grain of salt but based on these numbers from a stock and CNC ported head it flows pretty well. I left some meat on the bone on the exhaust side but still managed to double up the stock port. She should be a runner.


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