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Hello fellow straight 8ers. I am cleaning house and i have been tripping over a 1948 248 engine block, crank, cam, oil pan and other misc. parts for far to long. If you are interested in any or all...

What ever happened with this project??????

I think the process CNC dude referring to is called "Lock n Stitch". It has to be done perfectly or it will leak.


Jyrki: Question on your surface finish. What kind of machine did they mill...

Here are pictures of a typical cylinder head flow fixture we made to flow test a Triumph TR6 head. I would just make one of these with different bore size for a 263

Kevin

Chamber length (across valve centerlines) is 3.240
Chamber width is 3.210

The reason for the difference is because the chamber is cut so as to deshroud the valves (from the factory in...

YES! Mine does have the water ports near the valve cover rail! I will get some casting numbers/dates for you when I get back to the shop :)

Here are some dimensions:

Int. valve size 1.565 (.035 larger than 248 int)

Ex valve size 1.435 (.090 larger than 248 ex)

Int. port dia. 1.335 (.080 larger than 248 in port)

Ex. port...

Ok, here are some more pics. You can see in two of them how much taller the actual head is and the raised runner design (why they got away from this head design is beyond me. Probably to save money...

I would say it's a much better port, but still not ideal. You could use some aspects of it though. A good starting point :)

I haven't flowed it yet. I was going to compare it too a 248 head I have. This is my busy season as far as Cylinder head porting goes. But I should have some time this spring yet.

The head is the same bolt pattern as the 248/263 heads. The pictures are hard to see any detail but the fact that you can see the pocket so well from the intake runner shows that the "T" junction is...

Maybe this time????

Here are the pics (hope they show up. I forgot how to attach a file)

I will try and shoot some more pictures of it tonight or sat., take some rough dimensions and get them on here. I assure you that this head has been unmodified and is just as I described from the...

Absolutely! I am willing to share the info with anyone interested. I would have to dig it out but I can do that.

Yes......Buick did have an early head that had a different port and combustion chamber design. It's actually much better too!!! The intake ports were bigger, had a MUCH better shape (for a siamesed...

By this drawing it looks as if the valve tips, (especially the ex.) would extend past the valve cover rail. Would have to play with valve angles.

One more thing to add about Singh-grooves (since we are somewhat on the topic)

I haven't experimented with them much but I have seen heads where people have tried (rather crudely) to implement...

I agree with Buick Guy. Installing too large a valve could have a negative effect with shrouding among other issues.

The "perfect ultimate" 263 head would be different per application. Are you building a head for high performance street, full out race, or somewhere in between?

P.S. I am in the Minneapolis area

I have a bare 248 block you can have for a very minimum price. I also have a 248 head cut into cross-sections you can look at. It will give you an idea of the layout.

Where in Western WI are you? I am in the Minneapolis area and I am a cylinder head guy. So I would be interested in what you are doing. I am also willing to help wherever I can

Love the old "crate" it's in. Very cool

Yeah 39cent! I plan on doing all kinds of different things and provide tests along the way.