4340
Forged Crankshafts
These
Pontiac forged 4340 cranks are designed with
the latest in oiling technology. On most crankshafts
the rod feed hole is only drilled to the centerline
of the main. This method of drilling doesn't
deliver enough oil to the rod. This creates
a high centrifuge, high pressure zone at the
main, restricting critical oil flow intended
for your rods. As engine rpm increases this
centrifuge effect gets worse, which can result
in unnecessary crankshaft damage or even total
engine failure. This is why we incorporated
Straight
Shot Oiling which virtually eliminates
this problem by utilizing off-center drilling
and a teardrop design oil hole, which scoops
oil at the main and forces it into the rod
feed hole. In addition the entry holes for
the rod feed are located near the O.D of the
main allowing unrestricted and equalized flow
to the rod bearings. We have complete balanced
rotating assemblies using these cranks.
If you don't see the combination you want,
contact us and we will put it together for
you.
|
Part
#
|
Description
|
Price
|
|
OCR-44003750
|
OHIO 3.750" Stroke, 3"(400) Main Forged
Crankshaft-2.250"(Pont.) Rod Journal
|
$649.00
|
|
SCA-4-400P-4000-6700-220
|
SCAT
4.00" Stroke, 3"(400) Main Forged Crankshaft-2.200"(BBC)Rod
Journal
|
$699.00
|
|
SCA-4-400P-4250-6700-220
|
SCAT
4.250" Stroke, 3"(400) Main Forged Crankshaft-2.200"(BBC)
Rod Journal
|
$699.00
|
|
SCA-4-400P-4500-6700-220
|
SCAT
4.500" Stroke, 3"(400) Main Forged Crankshaft-2.200"
(BBC)Rod Journal
|
$699.00
|
|
OCR-44004210
|
OHIO
4.210 stroke 3.00"(400) inch main Forged
Crank , 2.250"(Pont.) rod journal (standard
oiling)
|
$649.00
|
|
SGI-C3-400PA
|
SGI
4.210" Stroke, 3"(400) Main Forged Crankshaft-2.200(Pont.)
Rod Journal
|
$649.00
|
|
SGI-C3-400PB
|
SGI 4.250" Stroke, 3" Main(400) Forged
Crankshaft-2.200"(BBC) Rod Journal
|
$649.00
|
|
SGI-C3-400PC
|
SGI
4.500" Stroke, 3" Main(400) Forged Crankshaft-2.200"(BBC)
Rod Journal
|
$649.00
|
|
OCR-44554210
|
OHIO
4.210" stroke 3.25"(455) inch main Forged
Crank, 2.250"(Pont.)-rod journal (standard
oiling)
|
$649.00
|
|
SGI-C3-455B
|
SGI 4.250" stroke 3.25"(455) inch main
Forged Crank , 2.200"(BBC) rod journal
(straight shot oiling)
|
$649.00
|
|
SGI-C3-455C
|
SGI
4.500" stroke 3.25"(455) inch main Forged
Crank, 2.200"(BBC)-rod journal (straight
shot oiling)
|
$649.00
|
4.25
OR 4.500 CRANK CLEARANCE
This
picture shows the only area that normally
needs to be clearanced to put either a 4.25"
or 4.500" stroke crank in a Pontiac 400 block-
although any new part should be installed
and all clearances checked prior to final
assembly because of factory production variances.
Below
is taken from an article from Popular Hot
Rodding Mag Oct. 07 issues
"It's
been 30 years in the making, but Pontiac enthusiasts
now have both aftermarket cast and forged
cranks at their disposal. In the late '90s,
Butler Performance teamed up with Eagle to
produce the first aftermarket Pontiac crank,
a cast-steel 4.250-inch unit for 3-inch main
326/350/389/400 blocks. Just this year, Butler
Performance released 4340 forged cranks in
4.000-, 4.250-, and 4.500-inch strokes for
3-inch main blocks. The company also offers
4.000- and 4.250-inch 4340 cranks for 421/428/455
blocks with 3.25-inch mains. "Before we released
these cranks, the only option was offset grinding
a stock crank, which netted an extra 4 to
5 ci," David Butler says. "Forged cranks are
so reasonably priced these days, there's no
reason to even bother with a stock piece."
