2011 - Crane Cams

Other sizes are available on request. Camshafts having larger
than stock journals incorporate a step ground on the
front journal, so that a standard size camshaft sprocket can
be used.
Standard firing order (1-8-4-3-6-5-7-2) and SFO (1-8-7-3-6-
5-4-2) firing order hydraulic roller and mechanical roller
camshafts are offered, along with other custom options for
180 degree crankshafts and other unique situations.
In some applications where large diameter camshafts are
being used, this may result in the lifter sitting too high in
the lifter bore for proper oiling to occur. We currently offer
specific roller lifters to maintain proper oil flow. Check the
Roller Lifter pages for part numbers and applications.
Drilling and tapping the rear cam journal for the Sander
accessory drive is offered (RD suffix), as is gun drilling the
camshaft for lightness and reduced torsional deflection (DR
suffix).
1991-1995 Gen V 454 V8
This is one of the more misunderstood variations of the
basic Mark IV engine configuration. During these years,
Chevrolet was offering the Gen V 454 just about exclusively
in truck applications, with some marine use occurring. The
engine block was updated for provisions to install a camshaft
thrust plate, and hydraulic roller lifter guidebars,
although a hydraulic camshaft and flat faced lifters were
installed. The front of the camshaft was slightly stepped
down at the front, requiring a special cam sprocket, but the
normal cam bolt pattern was retained. Some of these
blocks had provisions for a mechanical fuel pump, while
others did not. The rocker arms were no longer adjustable,
as a stepped stud net-lash system was employed.
At this time, a number of different aftermarket engine suppliers
began offering their own iterations of the Mark IV,
which they sometimes called the “Mark V”, but were not the
same as the factory items. These were basically engines
assembled from Mark IV type OEM or aftermarket components,
and could be loosely thought of as independently
continued Mark IV production. Caution needs to be used
when ordering replacement components for these engines,
as they could become confused with the factory Gen V
items.
Most of our 13 prefix camshafts and components as used
in the Mark IV engines can be applied to the Gen V. A Mark
IV style timing set will be required. We offer special rocker
arm studs, 99152-16, that will thread into the Gen V cylinder
heads, 3/8” – 16 on the bottom, with a conventional
7/16” – 20 threaded top, permitting the use of adjustable
Mark IV type rocker arms, while using the Gen V pushrod
guideplates.
The availability of aftermarket components and complete
engines for the now legendary Big Block, in it’s many versions,
assures it’s popularity for some time to come. Crane
Cams will continue to produce new product offerings for
this very prolific powerplant.
1996-2000 Gen VI 454 (7.4L) – 502 (8.2L) V8
The upgrades that Chevrolet hinted at in the Gen V engine,
achieved production status in the Gen VI. This engine family
is designated by Crane Cams’ 16 prefix camshafts and components.
A hydraulic roller camshaft was installed, incorporating
a reduced diameter bolt pattern on the stepped journal
front, accommodating the installed thrust plate, and
hydraulic roller lifters were now standard equipment. A new
timing set was required for the new configuration camshaft,
and reduced depth under the standard front cover allowed
room for only a single row roller timing chain. There is no
provision for a mechanical fuel pump. The rocker arms were
still the non-adjustable net-lash style, which could again be
converted to an adjustable configuration by using our
99152-16 rocker arm studs and Mark IV type rocker arms.
Cam bearing diameter was maintained at 1.948”, as was the
1-8-4-3-6-5-7-2 firing order.
We offer steel billet hydraulic roller and mechanical roller
camshafts that incorporate the Cast Iron distributor drive
gear and rear camshaft journal (IG suffix) for these engines.
Left Hand rotation camshafts for marine applications are
also available.
Versions of these basic engines continue to be available
through the GM Performance Parts catalog, equipped with
various cylinder head combinations. Gen V blocks with
Mark IV type heads being a popular assembly. Be sure of
what components are needed when ordering.
2001-2008 8.1L (Vortec 8100) V8
What appears to be the final factory production Big Block,
received additional upgrades in its latest version. This is a
distributorless engine, incorporating a new hydraulic roller
camshaft (having a 1-8-7-2-6-5-4-3 firing order), new timing
set (incorporating a cam position sensor), relocated lifter oil
galleries, and a different net lash rocker arm system (with
the cylinder heads now tapped with 10mm threads). Our
26 prefix is used for these camshafts and components.
Crane Cams’ steel billet hydraulic roller camshafts for these
engines are equipped with cast iron distributor drive gears
and rear journals (IG suffix) for oil pump drive gear compatibility.
The 26 and 16 prefix (Gen VI) camshafts can be interchanged,
with appropriate engine changes required for
their different firing orders.
Due to the relocated lifter oil galleries, different lifters are
required. We offer our steel billet bodied 26535-16 hydraulic
roller lifters for use with the factory alignment bars to
allow the use of higher than stock lift camshafts.
The rocker arms can be converted to an adjustable configuration
by using our 99155-16 rocker arm studs. These
have 10mm threads on the bottom, and 7/16” – 20 on the
top, for use with the Mark IV style rocker arms.
866-388-5120 • 386-236-9983 FAX 109