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FINALLY a high tech rocker support kit for your 426 Hemi.
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DVORAK MACHINE
now has the last word in rocker arm supports, the first
innovation in this area in 40 years. Now that Dan Dvorak has
made the leap from the Max Wedge to the 426 Hemi in his race
car, expect the new high tech products to come fast and
furious. |
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It has
taken him many years to even have any desire to run the Hemi
and had to wait this long for NHRA and IHRA to come up with
something to his liking, a Hemi that he can run in a 1964
car in STOCK ELIMINATOR. I just couldnt quite
see myself in a Challenger or a Cuda. I was born and
raised in the 62-64 cars and I will be buried
in one. he promised.
This support kit consists of 10 stands and all of
the necessary hardware. Plenty of other support equipment is also
available to round out the valve train but lets look at the
supports.
The first thing to notice is that once the rocker arm assembly
is bolted through the cylinder head and into the block, the head
never needs to be loosened up again to remove the
rockers and rocker shafts. Stock units and even the new and late
model expensive Mopar Performance stands require that you release
torque on the head by removing the five LONG center cylinder head
attaching bolts. The result is the UNCLAMPING of the head and almost
certain compression, oil or coolant leak. If you have a Hemi you
know how often rocker removal is necessary. If you have to remove
the rockers with stock or stock type aftermarket stands, you MUST
leak test the assembly before you fire the engine.
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the new DVORAK MACHINE
Hemi rocker support package. Made from 6061 T-6 premium virgin
Aluminum and hard anodized, AND the head bolt hole is sleeved
and protected from crush with “HEAD SAVERS”. Simply bolt them on
as usual and then remove the shaft hold downs, similar to what
is used on the 440 engines, to lift off the shaft and rockers as
an assembly. |
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You can remove the intake
shaft/rockers independent of the exhaust shaft/rockers and
reinstallation is a breeze because there is always a position
to rotate the engine in which all 4 intake valves (or all
4 exhaust valves on a given side) are closed or almost closed,
making compressing the spring gentle and break proof. The
supports are drilled and tapped for grade 8 3/8 studs, HD
washers and 12 pt. nuts and the clamps are hardened steel
that surround the shaft giving the rocker arm
itself plenty of surface contact area to support the hard
shims. All of the above mentioned hardware pieces are included
with the kit. The simplicity of design and ease of use is
outstanding, but there is much more.
NOT ONLY do you not have to loosen up the head to remove
the rockers, the engineering design of the stands allow for improved
rocker arm tip GEOMETRY in two important ways, correcting
poor factory geometry and allowing for the changes and improvements
that are necessary when building and blueprinting the incredible
HEMI engine.
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First, we raised the
height that the shafts will stand by adding .060” of
material to the bottom of the supports. Even the least
invasive valve job and valve grind will benefit from the
extra clearance but so many times, much more grinding is
needed and done to establish necessary valve to piston
clearance and valve to valve clearance.
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As all of the components of the hemi are
fine tuned and tweaked for best possible performance and
fit, the geometry always suffers and will ultimately need to
be addressed. Unfortunately until now there has been much
too little that could be done about poor geometry, save
butchering the valve tips and opening a new Pandora’s Box of
trouble.
Second, raising the shafts
will only correct part of the problem. As we all painfully
know, as the valve moves into the head either by thinning
or sinking, either on purpose or by correction, the tip of
the valve moves AWAY from the tip of the rocker at the same
time that it moves upward! SO, we moved the shafts OUTWARD
toward the exhaust valves and the intake valves, yet another
.060! The final tip alignment, and contact area, or scrub angle,
which makes the geometry with these movements built in into the
stands, is nothing short of phenomenal, from stock to heavily modified.
You will measure the difference, you will feel the difference and
you will see the difference. You will also realize the difference in valve guide life, maximized
lifts and best horsepower. Never before has so little yielded such
dramatic results and the price for the whole kit is less than the
factory replacement pieces. RSSH-K Shaft Supports, studs, shaft surrounds, nuts and washers,
hardened alignment shims
RSHI 2 intake shafts, .250 wall heavy shafts induction hardened,
easy clean TM tapped holes with revised oiling to rocker arms.
RSHE 2 exhaust shafts, .250 wall heavy shaft, induction hardened,
easy clean TM tapped holes with revised oiling to rocker arms.
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