Max head flow for 25 psi race motor

[05stroker]

Dang! your braver than i am. However some swear by hand porting.. We have a local shop that hand ports small and bb ford heads and his stuff is the fastest pushrods in our area. :thumbup: :thumbup:

There is no way I would do this for a car that needed to use the factory gaskets and such. I am doing this because I want the ports larger then the off the shelf stuff that has to line up with the factory intake gaskets and such. Plus I don't want to spend $4000 on a set of heads. I will be making my own gaskets for the delete plates and the intake.

Why is this thread not moved to Tech yet?

Because I always get off topic. LOL

 

[05stroker]

Here is the valve removal tool I made.

 

[05stroker]

rcm90,

Do you know if the area in between the two intake runners is solid? I would like to take a lot of meat out in the areas in the pic below.

 

[05stroker]

And also this area in the exhaust port.

 

[RED09GT]

rcm90,

Do you know if the area in between the two intake runners is solid? I would like to take a lot of meat out in the areas in the pic below.

If you go back to posts 46 and 47 he gives me the answers to pretty much the same questions. There seems to be lots of meat on the intake port by the spark pug boss and a decent amount behind the exhaust valve.

 

[rcm90]

For the exhaust port, unfortunately there is only around .140" from what I could see. That was sectioning the runner into four pieces and it looked consistent all around. Tomorrow I will cut it into eighths and get a better answer for you.

On the intake where you highlighted, I measured .206" and that is located 2" down from where the intake splits. I would say .120" would be a safe about to take in that area but not much more. Again with that, I can make more cuts to get a more accurate measurement.

 

[05stroker]

If you go back to posts 46 and 47 he gives me the answers to pretty much the same questions. There seems to be lots of meat on the intake port by the spark pug boss and a decent amount behind the exhaust valve.

I was having a little trouble comprehending some of the sections.

For the exhaust port, unfortunately there is only around .140" from what I could see. That was sectioning the runner into four pieces and it looked consistent all around. Tomorrow I will cut it into eighths and get a better answer for you.

On the intake where you highlighted, I measured .206" and that is located 2" down from where the intake splits. I would say .120" would be a safe about to take in that area but not much more. Again with that, I can make more cuts to get a more accurate measurement.

Thanks

 

[BruceH]

rcm90,

Do you know if the area in between the two intake runners is solid? I would like to take a lot of meat out in the areas in the pic below.

Does this help any?

 

[05stroker]

Is this the intake area I am talking about?

 

[05stroker]

Does this help any?

Haha, that pic online is what made me ask the question. Those heads are awesome works of art after seeing what it takes to do this.

 

[RED09GT]

Is this the intake area I am talking about?

It took me a while to study and re-orient myself with the pics but that is the area in question.

 

[05stroker]

I am going to go to town there next weekend!

Do any of you know of a tool that you can touch to a surface and measure the thickness?

Also, do any of you know what the min. recommended wall is for intake vrs water jacket and exhaust vrs water jacket?

 

[rcm90]

This should help.




On a side note, I received the casting rubber, so hopefully tomorrow I should be able to wrestle them out.

 

[05stroker]

This should help.




On a side note, I received the casting rubber, so hopefully tomorrow I should be able to wrestle them out.

Are those stock heads the rubber is in?

Also has the head you cut up been modified at all from stock?

 

[rcm90]

Yes sir, stock heads. I just cleaned up the areas that I measured from probably .005-.010" I would rather say there is less material than more and as a byproduct have you blow through into a water jacket or oil galley.

 

[05stroker]

Yes sir. I just cleaned up the areas that I measured from probably .005-.010" I would rather say there is less material than more and as a byproduct have you blow through into a water jacket or oil galley.

I have not. I am not measuring as of this point though. I have taken from areas that look safe.

That area around the base of the bowl at valve looks like it should not be touched by a hand port job!

 

[rcm90]

Cool deal. I can send you the replica of the ports for reference if you like.

If I create a really nice bowl port that flows better than Biggie Smalls, I will send it to a machine shop and have it profiled so it can be transfered to a cad file created for a CNC port.

 

[05stroker]

Cool deal. I can send you the replica of the ports for reference if you like.

I need to get some of that stuff. It would be cool to see the before and after!

The CC and the flow numbers will be even cooler!

 

[rcm90]

I found something a little cheaper than repro rubber. Not sure how its gonna turn out.. But should be close.


http://www.tapplastics.com/product/...pplies/tap_silicone_rtv_mold_making_system/61

 

[RED09GT]

Do any of you know of a tool that you can touch to a surface and measure the thickness?

Machine shops usually have a sonic tester that they can use for cylinder wall thickness, I would think that it would work for heads.



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