Turn the engine over and watch the pushrods carefully to see if any of them hit their respective holes in the intake. Both of these remain popular upgrades for enthusiasts wishing to pick up power, reduce weight, and maintain a factory appearance. Dual-plane and single-plane variations were produced, but always in very limited numbers and never in a production vehicle. That was the original plan. Use a small square to draw vertical lines along the sides of each port extending to the top of the gasket flange. The bolts should line up now, and can be lightly screwed into place. The exceptions are the same ones noted in Chapter 6.
Then you get to install the motor and remove it about 8 times until you get the thing to fit. Hard contact when the engine is running causes the pushrod to pop off the rocker arm. Here you see an edge hanging out into the airflow path—an undesirable situation. If nothing hits, you can proceed with the assembly. Checking the intake manifold fit at both the bottom and the top edge reveals any angle variances compared to the head. Usually you need to clear a bit of excess silicone from around the opening. I have enough material for 3 manifolds, and they are easily modded.
Lay the intake manifold in position, being careful not to disturb the gaskets. Journal bearing turbos are different thread. Some are swap-meet or online-auction fodder, while others verge on the exotic. The Victor is, thus, a good candidate for a dedicated race engine. Next take a flashlight, a dental mirror, and inspect for port alignment and bolt-hole alignment.
As a rare and valuable specialty item, a tunnel-port intake is not likely to be in the hands of an unknowing seller. While other Edelbrock intakes are ready to install as delivered, the Victor should be considered a base for modification. Install all the fasteners loosely before tightening any of them. Dry assemble the valvetrain with the lifters, rocker assemblies, and pushrods. The similarity of the Tunnel Wedge to modern performance intakes is startling, with the open-air gap below the runners.
The Holley Street Dominator and the Edelbrock Streetmaster are both worth chasing down as an alternative to new parts. And nothing looks better under the hood of a classic Mustang or Galaxie. Next take feeler gauges to the front and rear corners of the intake sealing flange of the heads. The factory manual has a torquing pattern, but you can torque down the fasteners from the inside out in a spiral. This is a detail photo of pushrod tubes in intake.
A sanding roll on the die grinder can be used to straighten, finish, and polish the port surface. Both have a factory appearance, with the Blue Thunder being restoration-style muscle and the Dove being a bit more race-car oriented. The pressure-testing rig is simple and easy to make. Having the runners away from eachother also helps reduce turbulence from the flow and reverse flow of the intake. You can read about that. Dove made tunnel rams for a very short time and they are quite rare. Myself and at least 3 other people had issues with the Chilkat mounts.
Aftermarket Dual-Plane Intakes Dual-plane intake manifolds, with the port runners split into upper and lower groups and having a divided plenum, are the most popular choice for street-oriented builds. If you combine the number of machined surfaces, the size of the intake, and the age and unknowable history of the various parts, you have a recipe for a very challenging assembly project. Pushrod fitment is the next step. The cost is modest, availability is obviously good, but the casting design, port shapes, and machining leave quite a bit to be desired. Your selection will reflect a combination of vehicle components and your performance goals.
Aluminum is so much easier to play with than the steel for the roller, hehehe. Do not use any end seals at this time. Most of my other manifolds have velocity stacks or radiused edges for the runners. The traditional medium-riser configuration is essentially a reproduction of the original Ford part, said to be made from the original tooling. But they are actually tougher to source than the dual-quad setup and nobody reproduces the intakes. Although the dual-plane intakes are acceptable for a street build, these older aftermarket intakes are not the best choice for a race build. Blue Thunder makes the most popular dual 4-barrel intake.