My Tunnel Port Heads Build

[1967 XR7 GT]

I, went with a Set of Jays TP, with SE Exh Ports from his FE Power Cyl Heads

For Valves, I choose Manley's Severe Duty 8mm Hollow Stemmed 2.300" headed Int Valves @ 142g & Manley's Severe Duty 5/16" Stemmed 1.675" Headed Exh Valves @106g

For Valve Guides, I went with C.H.E. Precision Guides, I prefer a Quality Guide, these provide increased wear characteristics due to CHE's proprietary Bronze Blend, which help provide reduced wear, even with todays lifts & spring pressures. Most of this is from their onsite sales pitch.

Stem Seals: It's said the 5/16" seals will work on 8mm valves, but I went ahead and got 8mm seals, because those are what should be used.

I, was able to find a manifold, that I had Vapor Honed.

[frnkeore]

Very nice!!!

What is the reason that your going smaller on the exhaust valves?

[Stangman]

Just guessing but probably because he went so big on intake. But I could be wrong.

[e philpott]

Did you have to fill the floor of the intake ?

[1967 XR7 GT]

Very nice!!!

What is the reason that your going smaller on the exhaust valves?

The valve spacing on Jay's TPs will allow for a 1.75" valve and will only work on 4.233" bore or larger, but the SE port was designed with the 1.675" valve, because the valve spacing is smaller on Jays FE Power heads so their able to fit smaller bores.

I, chose the 1.675" valve over the others for several reasons, 1st, with the SE Port it already will flow about 240 cfm @ .600" lift, and I believe Jay mention it should support about 900 HP.

I,chose the 5/16" stemmed 1.675" headed valve that weighs 106g, it's 18g lighter than the 3/8 stemmed, 1.75" headed valve @
124g, a 11/32" stem would be a little lighter, as would a 1.71" valve.

Another issue besides weight, a chose the smaller valve because a larger valve increases shrouding issues.

To answer Stangman's Post:
No, I didn't use the 1.675" valve because of the 2.300" Int, actually because of the 1.675" valve, I could of went to a 2.350" valve easily, maybe even 2.400", but then I would definitely would of had shrouding issues.

To answer e philpott's Post:
No, Jays New Aluminum Tunnel Ports, come cast with the Raised Floor on the Intakes.

[My427stang]

Looks great to me, what are the bolting on to?

[frnkeore]

I had to abandon my .309 valves because they were no longer in stock with my valve supplier and would have to wait 4 mo to get them.

I was going to run them with 11/32, 1.75 ex valves, to match in/ex weight, so, I had to buy both at 11/32 and have them drop to Jay so, he can drop ship them to Blair, with the heads, for his 7 angle valve job.

[e philpott]

Did you have to fill the floor on the intake manifold too ?

[1967 XR7 GT]

Did you have to fill the floor on the intake manifold too ?

I, wasn't paying attention before. Yes, I'll have the Int Manifold Ports filled in to match the heads. I, wonder how bad it could be though,  the majority of the flow is at the top of the ports, since the air is being sucked thru the manifold.  Where the Exh has more of an issue since it's being pushed instead of being drawn, mostly.

[frnkeore]

Did Jay mention the push rod mods that you'll have to make on a factory intake, for a ~.700 lift cam?

[blykins]

Sometimes you do, sometimes you don't.  Just depends on the lifter, rocker, and pushrod diameter.  I've ran a lot of factory TP intakes with more than .700" lift without having to change/modify the tubes.  Also ran a factory 2x4 dual plane TP intake that needed the tubes modified with just .600" lift.  Lots of variables.

[1967 XR7 GT]

Pictures

[blykins]

Are you going to do anything to the casting flash around the outside of yours? 

[1967 XR7 GT]

Are you going to do anything to the casting flash around the outside of yours?

Your, talking about what looks like a parting line on the exh side that goes over and connects the exh ports.

I, haven't figured out what to do, if I were to grind it away, the flash would be gone, but where it was ground away would still leave a mark from the grinding, that just replaces the flash, that is still different enough from the rest of the head, which would still be kinda unsightly.

Could paint the heads to cover up the grinding, which would burn away over the exh ports, which would look like crap.

Grinding the rest of the head to match, forget that. I think maybe, wire wheel the rest of the head some what, so as to blend in the grinding so it doesn't stick out as bad, which shouldn't be to work intensive, I think would be the best option.

   

[Stangman]

In a shock tower car you won’t even see it. If the heads work well that’s the important part. I would probably leave it. JMO