SP SinglePort Heads P&P

[xavi_242]

3 anlge valve job is what it's going to be happening, that's for sure.
I'm going to run a CB 2232 cam and a 8 CR...
http://cbperformance.com/catalog.asp?ProductID=1244
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1967 Split SO-42 Dormobile

[ralf]

Sounds good, for the cam and comPression , it looks like its gona be a decent street engine just do a few more clean up on the intake , more so on the inner walls of the intake coming from the chamber

This will naturally shape the divider in a more profiled manner but dont take too much material out
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Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk

[xavi_242]

[ralf]

Opposite the bowl (guide side wall) the side that joins the other port , clean it up and contour it from the chamber side
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Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk

[xavi_242]

[xavi_242]

so... after a loooong time I took again this project and took odd the heads from the shelf (they where literaly part of our book shelf at home) and started the work again.

Got the head from the machine job, now the 90,5s just slip in very smooth

This easter holidays I'll finish the porting job and then the 3 angle valve job...

more to come!
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1967 Split SO-42 Dormobile

[FreeBug]

remember, the exhaust is like on a dual- port, so to keep an interesting inlet to exhaust ratio, concentrate your efforts on porting the intake. Exhaust maybe just polish to reduce heat absorption, don't over-port it.

[Alstrup]

Have you assembeled the case yet?

- I have used the 2232 in dual carbed sgl port engines a couple of times. I found that it provided good torque, but the engines were a bit short breathed, like 4300 rpm, - end of story. So I decided to go 2239 on the next build, which - did - create a slightly rough idle, but gave me more power above 4000 rpm.
Depending on what youtre after, you might want to take that into consideration.

T

[xavi_242]

[mark tucker]

get a set of good twin port heads.scat has some prostreet heads that are midely ported and ready to go, perfect for this type of engine.

[xavi_242]

[xavi_242]

marked the inner cylinder walls on the heads

then draw the area to unshroud

it took me one hour per chamber... tough work!

and the final result, note that I am very conservative...

BTW on the exhaust side of the right chamber, not the small scratch from the dremel tool. There's half of the sealing surface intact, the other half is scratched, not too deep, noticeable, though.

My plan was so just put some fine lapping compound on the cylinder sealing surface and rub a little bit the cylinder against the head, just to smooth it a little bit. I was planning to do that on all 4 cylinders, not just on the scratched one.

What do you think?

Thanks!
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1967 Split SO-42 Dormobile

[xavi_242]

finished the porting work after removing the valve guides...

intake:

exhaust:

Now time for the guides to go in...
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1967 Split SO-42 Dormobile