My Tunnel Port Heads Build

[1967 XR7 GT]

Exh flow numbers for the FE power Cyl heads, with the SE exh port and 1.675" valve.

Hopefully, the Tunnel Port heads with the SE exh ports (Pictured), will have the flow numbers as good as the FE power heads or at least close. I, am mentioning this because, From what Jay said, their not exactly the same, and so the flow numbers may not be either, and until we have the ports flowed, the numbers are a guess.

The chamber in my SE and RE heads is better for flow than the tunnel port chamber I designed.  The reason is that the valves are moved towards the intake side of the head, making them closer to the center of the bore with my SE and RE heads.  This allows for a more gradual turn to the deck on those heads than is possible with the tunnel port design, or any FE design for that matter with the stock valve location.   

The bottom head is a TP with the stock exh, to compare with a TP with the SE exh.


 

TP With SE Exh Port




TP With Stand Exh Port

[hbstang]

funny,that last picture kind of looks like they were 3d printed.

[cjshaker]

funny,that last picture kind of looks like they were 3d printed.

The casting cores are 3D printed, which helps Jay keep the costs down.

[1967 XR7 GT]

I, was thinking new Intake gaskets for the raised port TP's along these lines, some trimming required.

[blykins]

When we do “ported” factory TP heads, we always fill the floors and I just use a standard Mr Gasket TP intake gasket. 

[1967 XR7 GT]

When we do “ported” factory TP heads, we always fill the floors and I just use a standard Mr Gasket TP intake gasket.

I, thought I would step up and have some ran, since there are none available anywhere. I, bought a set about 6 months ago, Mr. Gasket 205G, a couple months back I was going to pick up a spare set, just to have on hand, but they were no where to be found, so I looked into having some ran, and thought why not fill the gasket in for the raised port.

[blykins]

When we do “ported” factory TP heads, we always fill the floors and I just use a standard Mr Gasket TP intake gasket.

I, thought I would step up and have some ran, since there are none available anywhere. I, bought a set about 6 months ago, Mr. Gasket 205G, a couple months back I was going to pick up a spare set, just to have on hand, but they were no where to be found, so I looked into having some ran, and thought why not fill the gasket in for the raised port.

Good idea.

[frnkeore]

Richard, are you selling them?

[thatdarncat]

Just a FYI for the group, Cometic makes Tunnel Port intake gaskets, and makes them in different thicknesses. They don’t show them in their catalog, but they have the pattern. There may be a slight wait to get them since they’re not a “shelf” item. I have bought them from Cometic because I needed a thicker gasket than the Mr Gasket ones.

[1967 XR7 GT]

Richard, are you selling them?

I, am trying to work out some issues, to keep costs reasonable, if so, I'll have them for sale.       

[1967 XR7 GT]

Heads so far.

2.300" Int's
1.675" Exh's



As is, the SE Exh ports flow 240 cfm @ .600" lift.



As is, the stock Int Ports flow 339 cfm @ .600" lift

[frnkeore]

Richard, are you going to flow them with the 2.3 valves?

[1967 XR7 GT]

Richard, are you going to flow them with the 2.3 valves?

I, should have flow numbers after I get them ported.

[1967 XR7 GT]

I got my Heads and Manifold back today.

Here are the flow Numbers for the Head's Intk's. Actually, their still a work in progress. Currently the Chamber Bore's are @ 4.250" and are shrouding both the Int's & Exh, so the Chambers will be open up to a 4.310" Bore. I, didn't really want to go that large a bore, but because of the Int size, I have no choice. But then, unshrouding the valves will pick up the flow slightly.

The 1.675" exh valve is too small, I'll be going to a 1.800" valve and opening up the seat to match where the issue lies, it was also recommended to go to Tulip valves to assist flow, but I don't like their extra weight. 



                                                               These specs from bowl cleanup & valve job 
                                                                                 


My TP Heads Int Flow Numbers
.400     258.16 
.500     308.48     
.600     356.53   
.700     390.40
.800     411.79
.900     425.16

 First prototype tunnel port head Ported by Joe Craine
Lift            Intake       Exhaust (no pipe)
.100"          78             58
.200"         155          114
.300"         227          141
.400"         285          192
.500"         330          212
.600"         357          219
.700"         379          222
.800"         390          230  (260 with pipe)

 







Here's a picture of the Epoxied & Ported Int, which had an Averaged flow of 460CFM





The Exh:

[e philpott]

serious high lift numbers !! Can you change the seat angles to get some of the lower lift flow back or are you using a high lift cam and concentrating on high end power  ?