How far can I go with the thermactor hump (porting)

[mag2555]

You in no means need to grind that out all the way as having that sitting right after the valve guide effects the flow only to the tune of 3 to 4 cfm at most if you Boat tail it on its nose and then trim the rest down into a triangle , in fact you do not even need to lower its height when forming it into a triangle.

Just make up for the guide and that lump being there by widening out the cylinder wall side of the roof some and deepening it .040" starting at the mid lenght of the guide since that's by far the most active side of the roof due to the way flow actually enters the port from Around the valve.

Short lenght Exh ports like that are highly effected by letting the flow go the way it wants to and not kick it around from side to side on the roof.

[PRH]

What kind of power level are we looking for out of this build?
350hp?
Are these 351 heads with 1.78/1.45 valves?
Are you keeping that valve size?

If you had the luxury of a flow bench handy, what kind of ex flow would you be shooting for??

[travis]

What kind of power level are we looking for out of this build?
350hp?
Are these 351 heads with 1.78/1.45 valves?
Are you keeping that valve size?

If you had the luxury of a flow bench handy, what kind of ex flow would you be shooting for??

These are 351w heads with 1.78/1.45 valves, although this vintage 351w used 302 heads...the only difference literally being the head bolt holes are slightly bigger.

350hp would be a pipe dream with these things. At this point I don’t think these are worth spending the money or effort to take them any further.

[travis]

E5AE-CA heads...pic 1 vs pic 2

.050...20...21
.100...39...40
.200...77...77
.300...105...109
.400...111...121
.500...115...126
.600...116...126
WFO...116...126

Bloody pathetic

[travis]

E5AE intake port, light bowl blend, streamlined the guides a bit, blended the short turn and removed the sharp lip off the bottom of the short turn

.050...32
.100...65
.200...116
.300...148
.400...160
.500...167
.600...167
WFO...167

[travis]

Compared to data I have for stock E7TE’s (since I we didn’t baseline the bone stock E5AE ports), a mild bowl blend on these is worth 0-12cfm at any lift point. This was about 2 hours worth of work total for both heads, and still with the stock single 45 seat. Throwing in another hours or so for 1 exhaust port, was worth another 4-10 cfm above.300” lift.

So...basically a complete waste of time, but it was educational. The education being that iron sucks, and ford smogger heads REALLY suck unless you want to spend a very significant amount of time and effort developing them.

[Carnut1]

You make it sound like the infinite grinding isn't worth it!

[PRH]

I wonder how much of that 10cfm on the ex you could get in 5mins?


Whatever it is...... that’s what they’d get!!
Okay, maybe 10mins.

That’s the kind of thing that’s a 3hr job for me....... for the pair.
180mins, 16 ports...... 11.25mins per hole.
Then iiwii.

Gonna need to step up with the cam to get it to 350hp.

[travis]

You make it sound like the infinite grinding isn't worth it!

It’s only worth it if you’re a bit of a sadist

Although now I’m sitting here thinking “what if I took some more off around the guides and laid the short turn back some?”.

Sometimes ignorance is bliss lol

[travis]

I wonder how much of that 10cfm on the ex you could get in 5mins?

Probably all of it, if you know what your doing lol

[travis]

It would be much easier with round stones and a high speed grinder such as a Dewalt. Gives a much nicer radius, better control of material removed. The E-7 style EGR hump can be nearly made flat with the roof if done properly in the bowl. Those ports can be brought up to 180 cfm without a pipe. Joe-JDC

The problem is...the damn port is so small that a round stone won’t even fit in there, until after you whittle out a bunch of iron with a burr.

180 cfm?? I am a LONG way from there. I’m assuming that is with a 1.60” valve?

Would there be any benefit to lowering the floor any? Or does the majority of the work need to be roof and cylinder side wall?

What flange dimensions do you end up with? This will have 1.5” headers...I need to get the gaskets ordered so I can see where I’m at

[Carnut1]

It would be much easier with round stones and a high speed grinder such as a Dewalt. Gives a much nicer radius, better control of material removed. The E-7 style EGR hump can be nearly made flat with the roof if done properly in the bowl. Those ports can be brought up to 180 cfm without a pipe. Joe-JDC

The problem is...the damn port is so small that a round stone won’t even fit in there, until after you whittle out a bunch of iron with a burr.

180 cfm?? I am a LONG way from there. I’m assuming that is with a 1.60” valve?

Would there be any benefit to lowering the floor any? Or does the majority of the work need to be roof and cylinder side wall?

What flange dimensions do you end up with? This will have 1.5” headers...I need to get the gaskets ordered so I can see where I’m at

I will see if I can help. That would be 1.6" valve with a good valve job and very good porting job. Do not make the flange dimensions larger than stock! The flange is not the restriction. The floor, just clean up issues. Do not hog out bowl, expand the bowl in areas the air needs to expand to get around obstructions. I start with guides and a valve job first.

[gmrocket]

Any pics on this mystery?

[Carnut1]

Any pics on this mystery?

Not for this exact exhaust port. Last set I did like this was low performance, more of a cleanup which did net decent improvement in flow.

[Carnut1]

20170902_192519.jpg

This is a 289 casting exhaust port with some work. Notice how the bowl enlarges a bit for the flow to go around the valve stem. This pic is off my Ported 289 thread. These heads did not have the large boss in the port.