geckonz08

I would like some advice please on blocking off/filling the x overs.
From what I have read it seems there are several variations on method and product.
Just some I have read to confuse me
1.use AL and fill to the valve pocket
2. --no. 1 with zinc added to Al.
3. pour from the valve side
4. pour from the intake side
5. heat head on bbq plate and then have checked for warpage
6. don`t worry about 5.
7. some scary-sounding ,ceramic/cementatious product to use as infill

A precis account of my initial thoughts are this--- infill using the Al/Zn product because melting point is lower. And using carefully crafted Al or Cu sheet, block off the valve pocket and pour metal in from the intake mani side --less mess to sculpt and clean up afterwards.

Further to this is another option,apparently, of a type of block off plate . Whether this is welded to the intake mani or the head , I don`t know and ofcourse this leaves a large air pocket from there to the valve pocket. What are the ramifications of this pocket ??

And then finally, the hollow, brass tube going inot the runners -??

I need some HELP PLEASE and all before I get onto welding the divider!!


Thankyou
mike

jensenracing77

i read about it and don't think i could tackle that one. i have done many things with cars but i think i would want to see it done before i tried myself. they do make a block off for the intake but that don't do anything for helping with the head.

88 coupe

Use a couple of old pistons.

Block the manifold side and pour into the valve pocket. Pour enough excess so you can shape them to match the ends.

Norm

geckonz08

thanks norm

$tryker

I am in this process also. Although, I do not wish to hi-jack the thread, maybe Norm can follow-up on his last response.

"Is it a couple of old pistons for the entire job, or a couple of pistons per head?"

Thanks!

geckonz08

for my 2cts worth, you aren`t hijacking but adding -go for gold -the more info the better isn`t it ?
The block off plate interests me but am unsure how the aerodynamics of the blocked off pocket would affect the whole .

Another thing which I read somewhere. A "small "hole was drilled in the blockoff plates presumably to allow "some "warm air to the intake . 1/4 " hole ??? or is this just an attempt at having a dollar each way ??

Any comment on that would be appreciated
cheers
mike

Warhead

This IS the only thing I hate about this site.
I posted 3 paragraphs in reply, and GOT BOOTED OUT.
Again
What a pain in the ***.
PM me and I will tell you more about pouring aluminum.
It really is worth it.
Jim in Phx.

citcapp

Warhead, I think it is your computer log on that is timing out. I have never had this problem and have posted several long replys. I hope someone who knows more then me about computers can chime in and help resolve your issut.

Warhead

It only happens when I log on to reply to a message.
If I log on before that-NO issue.
If I see something that I have to respond to, then log on, it drops me every time, after I write the response. Both of my computers.
As for log on time, I do not know.
If I am already logged on, it's no issue.
I just can not be spontaneous.
I'll post more on the aluminum pouring later.
Needless to say, I agree with Norm.
It's worth 20+ horsepower.
Jim

gmrocket

thats one of the reasons i dont post here,,its goofy&kicks me out sometimes, while othertimes i get logged in automatically.

gmrocket

oh my good, it worked. i'm gonna try it again!!!

gmrocket

woo hooo..again. damm, i had to wait 9 seconds..

Warhead

Thanks Dale, but it did it again cause something timed out.
Send me an PM, I will help, if you need any.
Jim