Camshaft and Valvetrain
Distributor gear wear can be a problem with steel roller cams so a bronze gear was install
We called on our friends at Comp Cams, told them our goals for the truck, and supplied all the pertinent information. Shortly afterward, they responded with a split-duration roller cam. Lift is .601-inch, while duration at .050 lift is 214 degrees on the intake, 224 degrees on the exhaust, and lobe centers are at 110 degrees.
The decision to go with hydraulic lifters was based on two considerations. First was the reduced friction between flat tappets and cam lobes. With today’s oils, accelerated wear can be an issue, particularly during break-in—roller tappets eliminate that problem. The second consideration was performance. According to the folks at Comp Cams, in nearly all circumstances, a good roller camshaft design will outperform its flat tappet counterpart. They add that the benefits of roller cams are higher tappet velocity, more lift and more area, along with reduced valvetrain friction (often a 15-plus hp increase), and higher engine rpm with little effect on low-speed drivability and power.
Ford 460 distributors can be found with two different shaft sizes: .500 and .530-inch. Com
Continuing the friction-fighting theme, we ordered a set of Comp Cams High Energy roller rockers. Featuring a die-cast aluminum body, they have a needle bearing fulcrum and roller tip to decrease friction and lower oil temperatures. To ensure a long service life, the pushrod sockets are fitted with steel inserts.
Internal combustion engines are basically air pumps, which means one of the keys to improving performance is to move air in and out more efficiently. To that end, the team at Ford Racing and Performance Parts got together with Jon Kaase and the results of that collaboration can be found in the new aluminum Super Cobra Jet heads.
To dress up our new engine we opted for a complete fastener kit from Totally Stainless. A
Lots of research resulted in revised valve angles and locations to reduce cylinder-wall shrouding and improve flow, and the combustion chambers were redesigned. While there were significant changes, these heads use the same valves, valve springs, retainers, and 7⁄16-inch stud-mounted rockers as the earlier Cobra Jet heads, and the same intake and exhaust manifolds fit.
We could have spent hours porting our stock cast-iron heads and not come close to the power potential of the new SCJ heads. Add to that our stock heads needed all the guides and valves replaced, had to be surfaced, and would require machine work to install studs and guide plates, the SCJ heads were a logical choice.
Induction and Ignition
Topping off our stroker motor is a Weiand intake manifold and a FAST EFI fuel-injection system. An MSD distributor will provide spark. In our next installment we’ll detail the operation of the fuel injection, dial in the ignition’s advance curve, and have a full report on the dyno test and tune session. CCT
Comp Cams hydraulic roller lifters are a key ingredient in reducing internal friction. Wit
With roller lifters, some way of maintaining alignment with the lobes is necessary. Comp C
Installing a cam correctly is more complicated than merely sliding it into the block. John
A new Fluidampr replaced the original vibration damper. Not only is the Fluidampr more eff
To keep our big Ford cool, we picked an aluminum water pump from Edelbrock. They’re design
Installing a vibration damper is not a hammer and block of wood operation. John uses a ded
Topping off our big Ford is a set of Ford Racing and Performance Super Cobra Jet aluminum
While it’s impossible to tell from the outside, valve angles in these new heads have been
With the Fel-Pro PermaTorque gaskets in place, John dropped the heads over the studs. A wi
Super Cobra Jet Aluminum Cylinder Heads (heads are sold individually)
Ford Racing part number 397-M-6049-SCJ
Fits 429/460ci engines (except BOSS 429)
Valve size: 2.200-inch intake/1.760-inch exhaust
Intake ports: 290cc
Exhaust ports: 148cc
Combustion chambers: 72cc
With our block/head/rocker arm combination special-length pushrods were necessary to maint
For rocker arms we went with Comp Cams die-cast aluminum rollers. They not only have rolle
The Ford heads came with guide plates and springs that can accommodate a high-lift cam. Th