| 10051181
|
Cast Iron Bow
Tie Bare Block |
|
|
|
This updated design has a decidedly different
appearance, but retains its original part number. New
tooling procedures have significantly improved the
quality and durability of this third-generation casting.
This heavy-duty cast iron Bow Tie block has rough-bored
3.875" diameter cylinders, which can be bored to a
maximum diameter of 4.030". This block is recommended
for maximum effort competition engines. The deck
surfaces are thicker than production blocks, and the
head bolt holes are blind tapped to improve head gasket
sealing. The main bearing bulkheads are .900" thick and
the front and rear bulkheads are reinforced with
strengthening ribs.
The updated design on this Bow Tie block's oil galleries
now extend flush to the front and rear faces of the
cylinder case and can interfere with some camshaft drive
systems. Therefore, timing system clearance should be
checked before engine assembly. The revised Bow Tie
block has a boss below the bellhousing flange behind the
#8 cylinder that can be drilled and tapped for lifter
valley oil scavenging. Oil drainback holes in the lifter
valley are drilled. The updated design provides more
consistency in the thickness of the cylinder walls and
water jackets. The cylinder bores have a nominal wall
thickness of .340" at the casting parting line (measured
2" below the deck surface). |
|
|
Technical Notes: Oil dipstick hole is not drilled
and the lifter holes are finish bored to production
diameter .842". Two-bolt main bearing caps are installed
to simplify the installation of the heavy-duty steel
main caps with splayed outer bolts. Bow Tie blocks are
designed for crankshafts with 2.45" diameter main
bearing journals. The Bow Tie casting block P/N 10051182
is machined for a one-piece rear main bearing seal used
on 1986 and later production small-block Chevrolet V8s.
Crankshafts designed for two-piece rear main seals can
be installed in Bow Tie blocks using crankshaft seal
adapter P/N 10051118. These blocks weigh 187 lbs.
|
|
|
|
|
|
|
10051183
|
Cast Iron Bow
Tie Bare Block (3.98" bore) |
|
|
|
|
This updated design has a decidedly different
appearance, but retains its original part number. New
tooling procedures have significantly improved the
quality and durability of this third-generation casting.
This heavy-duty cast iron Bow Tie block has rough-bored
3.98" diameter cylinders, which can be bored to a
maximum diameter of 4.090". This block is recommended
for maximum effort competition engines. The deck
surfaces are thicker than production blocks, and the
head bolt holes are blind tapped to improve head gasket
sealing. The main bearing bulkheads are .900" thick and
the front and rear bulkheads are reinforced with
strengthening ribs. The updated design on this Bow Tie
block’s oil galleries now extend flush to the front and
rear faces of the cylinder case and can interfere with
some camshaft drive systems. Therefore, timing system
clearance should be checked before engine assembly. The
revised Bow Tie block has a boss below the bellhousing
flange behind the #8 cylinder that can be drilled and
tapped for lifter valley oil scavenging. The outer water
jacket walls have bosses to allow coolant passages to be
drilled between adjacent "siamesed" cylinders. Oil
drainback holes in the lifter valley are drilled. The
updated design provides more consistency in the
thickness of the cylinder walls and water jackets. The "siamesed"
cylinder bores have a nominal wall thickness of .340" at
the casting parting line (measured 2" below the deck
surface). |
|
|
Technical Notes: Oil dipstick hole is not drilled
and the lifter holes are finish bored to production
diameter .842". 2-bolt main bearing caps are installed
to simplify the installation of the heavy-duty steel
main caps with splayed outer bolts. Bow Tie blocks are
designed for crankshafts with 2.45" diameter main
bearing journals. The Bow Tie casting block P/N 10051184
is machined for a one-piece rear main bearing seal used
on 1986 and later production small- block Chevrolet V8s.
Crankshafts designed for two-piece rear main seals can
be installed in Bow Tie blocks using crankshaft seal
adapter P/N 10051118. These blocks weigh 187 lbs.
|
|
|
|
|
|
|
|
10066034
|
350ci Bare
Block |
|
|
|
|
This 350ci iron bare block is used on the 1973-85 GM
Goodwrench 350 engine and has the early-style 2-piece
rear main seal. Its main bearing caps are the straight
type four-bolt design. The block has a standard 4.00"
cylinder bore. |
|
|
Technical Notes: Can be used for 302, 327 and 350
engines. (Does not include oil galley plugs or dowel
pins.) |
|
|
|
|
|
|
|
10066098
|
305ci Bare
Block |
|
|
|
|
This production cast iron cylinder case has 3.74"
diameter cylinder bores and two-bolt main bearing caps.
It uses a one-piece rear crankshaft seal. 1986 and
newer. |
|
|
Technical Notes: This block's cylinder walls are
the same thickness as current production engines. Its
lifter valley is machined for hydraulic roller and flat
tappets. Crankshafts with two-piece seals can be
installed with adapter P/N 10051118.
|
|
|
|
|
|
|
|
10105123
|
350ci Bare
Block |
|
|
|
|
This engine block is used in 1986-99 Gen I heavy-duty
applications. It has 4.00" diameter cylinder bores and
four-bolt main bearing caps. This block is machined for
a one-piece rear crankshaft seal. (Does not include rear
seal or adaptor.) These blocks weigh 197 lbs.
|
|
|
Technical Notes: Cylinder wall thickness is the
same as current production engines. The lifter valley is
machined for hydraulic roller and flat tappets.
Crankshafts with two-piece seals can be installed with
adapter P/N 10051118. (Block casting P/N 10243880 or
14093638.) |
|
|
|
|
|
|
|
10134400
|
Aluminum V8
Block |
|
|
|
|
This block has the same dimensions and characteristics
of the Aluminum Cylinder Case (P/N 10185075) except that
it has a 2.65" (400ci) diameter main bearing size and
the bore is 4.120". Use cam bearing kit P/N 12370843.
This block is machined for a dry sump oiling system.
|
|
| |
|
|
|
|
|
|
|
10185047
|
350ci Bow Tie
Block |
|
|
|
|
This block, which can be used for 302ci, 327ci, and
350ci engines, is the same as the cast iron Bow Tie bare
block P/N 10051183, except that it has a "straight"
nodular 4-bolt main bearing cap. It also features "siamesed"
cylinder walls which could give it a maximum bore of
4.090". It has a crankshaft diameter of 2.45" and the
newer (1986 and later) one-piece type rear main seal. It
replaces the older P/N 366287 4-bolt block, the
difference being the one-piece rear seal. |
|
| |
|
|
|
|
|
|
|
10185075
|
Aluminum V8
Cylinder Case |
|
|
|
|
This aluminum V8 bare block weighs 90 lbs. and is cast
from prime ingot A-356 aluminum with heat treatment to
T6 specification. Wall thicknesses have been increased
for greater stress capabilities. The main bearing
diameter is 2.45". Its rigid deck surfaces are .620". It
has blind-tapped head bolt holes to improve head gasket
sealing. The cylinder sleeves are semi-finished at
3.986" and will finish at 4.150" bore diameter. It has a
4-bolt main bearing cap on all five locations of 8620
steel which will clear standard oil pans. The rear main
bearing is the 2-piece, pre-1986 design. These blocks
are wet sump designed but can be converted to dry sump
oiling by simply plugging the oil pump hole in its rear
main bearing cap. |
|
|
Technical Notes: Use cam bearing kit P/N
12370843. |
|
|
|
|
|
|
|
12480045
|
Block, 350
NASCAR Busch Series "327" Crank |
|
|
|
|
These 350 "CNC" blocks are designed for NASCAR series
racing. They are light weight with the following
specifications: CNC machined; 2.30" crankshaft diameter;
9.025 deck height; Bulk heads machined at 5 degrees;
Special steel main caps; 6AN water drain; 45 degree -10
AN fitting front oil feed; 4 center valley drains
drilled & tapped; Steam holes between cyl .0750 from
deck; 4.115" bore diameter; 58mm roller cam bearings;
.875 lifter bore diameter; AN o-ring plug replacement
pipe plugs; 1/2" NPS water hole each side of block; and
degree -10 AN fitting valley scavenge. |
|
| |
|
|
|
|
|
|
|
12480046
|
Block, 350
NASCAR Busch Series "2.64" Crank" |
|
|
|
|
These 350 "CNC" blocks are designed for NASCAR series
racing. They are light weight with the following
specifications: CNC machined; 2.64" crankshaft diameter;
9.025 deck height; Bulk heads machined at 5 degrees;
Special steel main caps; 6AN water drain; 45 degree -10
AN fitting front oil feed; 4 center valley drains
drilled & tapped; Steam holes between cyl .0750 from
deck; 4.115" bore diameter; 2.28" camshaft diameter;
.875 lifter bore diameter; AN o-ring plug replacement
pipe plugs; 1/2" NPS water hole each side of block; 45
degree -10 AN fitting valley scavenge. |
|
| |
|
|
|
|
|
|
|
12480047
|
Block, Bow-Tie
Sportsman "350 Main Size" |
|
|
|
|
This iron block is fully CNC machined from the H-D
10051184 casting. It has siamesed cylinder walls, cast
nodular caps, four bolts on all five main caps; the
outer bolts on the three center main caps are splayed 20
degrees. Grade 8 bolts secure the caps. It features
priority main oiling and 9.025" deck height. The blocks
come finished bored at 3.980" and the maximum
recommended bore is 4.150". This block features a
two-piece rear main seal; "350" main size (2.45"). It
features lifter bore heights (.842"), same as P/N
24502503. |
|
|
Technical Notes: It may be necessary to clearance
top of lifter bores with some roller lifters. The block
requires 2" O.D. cam bearings at all five locations (P/N
12370843 set. |
|
|
|
|
|
|
|
12480049
|
Block, Bow-Tie
Sportsman "400 Main Size" |
|
|
|
|
This iron block is fully CNC machined from the H-D
10051184 casting. It has siamesed cylinder walls, cast
nodular caps, four bolts on all five main caps; the
outer bolts on the three center main caps are splayed 20
degrees. Grade 8 bolts secure the caps. It features
priority main oiling and 9.025" deck height. The blocks
come finished bored at 3.980" and the maximum
recommended bore is 4.150". This block features a
two-piece rear main seal; "400" main size (2.65"). It
features lifter bore heights (.842"), same as
P/N 24502503. |
|
|
Technical Notes: It may be necessary to clearance
top of lifter bores with some roller lifters. The block
requires 2" O.D. cam bearings at all five locations (P/N
12370843 set). |
|
|
|
|
|
|
|
12561723
|
ZZ Small-Block
Partial Engine |
|
|
|
|
With its four bolt main block, and forged steel
crankshaft, the ZZ partial engine is a proven winner.
Used in thousands of ZZ4 and 385 Fast Burn crate engines
and the legendary ZZ430, the ZZ partial engine assembly
has a long history of durability and performance. Its
forged powdered metal connecting rods, steel crank, and
light flat top hypereutectic pistons ensure high rpm
performance. Provisions for a steel roller camshaft and
one piece rear main seal are state of the art.
|
|
|
Technical Notes: Does not include camshaft,
timing chain, sprockets, front cover, oil pump, oil pan,
balancer, or flex plate. |
|
|
|
|
|
|
|
22551788
|
Cast Iron
Rocket Block (Standard w/Wet Sump) |
|
|
|
This block is the same as P/N 22551790, except this is a
standard type with a wet sump.
Part Number.....22551788............22551790
Deck Height......9.025"(std.).........9.325"
(tall)
Oiling System...Wet Sump...........Wet Sump
Main Bearings...2.45" (350-type)...2.65" (400
type)
Bore Diameter...4.000"-4.190"......4.125"-4.190"
|
|
| |
|
|
|
|
|
|
|
22551790
|
Cast Iron
Rocket Block (Tall w/Wet Sump) |
|
|
|
This cast iron block is precision machined and does not
require additional "blueprinting" to correct production
tolerances. All block dimensions are machined to +/-
.001". The block's extra-thick siamesed cylinder walls
provide a minimum .275" wall thickness with a 4.125"
bore. The cylinders can be bored to a maximum of 4.155"
diameter. This block also uses the standard GM
small-block V8's 4.400" cylinder bore centerlines. The
outer water jacket walls are scalloped to enhance
coolant flow around the siamesed cylinders. This block
is available with deck height 9.325" (.300" taller than
production). The reinforced deck has a minimum .625"
deck thickness, regardless of the deck height specified.
The head bolt holes are blind-tapped and the head bolt
bosses are freestanding to minimize cylinder bore
distortion. The three steel 4-bolt center main bearing
caps have splayed outer bolts. The 2-bolt front and rear
bearing caps are retained with studs. Blocks with
standard deck heights use 2.45" main bearings; tall deck
height blocks use 2.65" main bearings. This block uses a
pre- 1985 two-piece small-block rear main bearing seal.
Compared to a production small-block V8, the Rocket
block's camshaft is raised .390" (4.912"
camshaft-to-crankshaft centerlines). This relocated
camshaft will clear a 4.125" stroke crankshaft without
interference, eliminating the need for a small base
circle cam when using a long-stroke crankshaft. This
block uses big- block V8 cam bearings. These larger cam
journals allow the camshaft base circle diameter to be
enlarged, which enhances camshaft strength and
reliability. The lubrication system has been revised.
This block has a "priority main" lubricating system that
directs oil to the main bearings before the cam
bearings. The main oil gallery is located next to the
camshaft tunnel: oil can be pumped into this gallery
through a boss above the timing chain cover or through
the bellhousing flange behind the #7 cylinder. In wet
sump versions, the rear main bearing cap is machined for
a standard oil pump. The oil pan rails are spread .800"
(.400" per side) compared to a production small-block
V8. These pan rails will clear up to a 4.125" stroke
crankshaft in tall deck blocks with minor modifications.
Other additions to this block are: dual starter mounts,
production bosses for side and front engine mounts, and
provisions for a block-mounted mechanical fuel pump.
Part Number.....22551788............22551790
Deck Height......9.025"(std.).........9.325"
(tall)
Oiling System...Wet Sump...........Wet Sump
Main Bearings...2.45" (350-type)...2.65" (400
type)
Bore Diameter...4.000"-4.190"......4.125"-4.190"
|
|
|
Technical Notes: Depending on components used,
bottom of bores and oil pan rails may require notching
and additional machine work for connecting rod and
counterweight clearance. Mounting the starter on the
left (driver's) side of the block provides additional
clearance for an extended oil pan. If the block-mounted
oil filter is eliminated, a remote filter is required.
|
|
|
|
|
|
|
|
24502495
|
Aluminum V8
Block for Big Displacement Engines |
|
|
|
|
This tall deck (9.525") aluminum block can be bored to
(4.160") and stroke to (4.125" with minor modification
and 4.250" stroke with major modifications). The deck
height is 9.525" with a 1.125" deck surface that can be
machined as low as 9.000". The bores start at 4.119" and
can be bored to 4.160" with a 2.65" (400-type) main
bearing size and the camshaft is raised 0.391" from
production location. Pan rails are spread 0.400" per
side for clearance of connecting rods. The main caps are
four-bolt design of 8620 steel with the three inner
middle caps having ball-end outer studs that are angled
outward at 20º to anchor the caps to the strongest part
of the block. The four-bolt front and rear caps have
straight outer bolts for oil pan clearance. The main cap
hardware includes premium bolts, centerless ground studs
and 12-point nuts. The rear main uses a 400-type
two-piece rear seal (Fel-Pro P/N 2909). This block uses
a priority main oiling system and is a dry sump design
with no provisions for an internal oil pump. The oil
filter pad is eliminated so the starter can be mounted
on either side and the fuel pump boss is also removed.
|
|
|
Technical Notes: Special oil pan, camshaft, and
timing chain are required for this block. Use cam
bearing kit P/N 12370843. |
|
|
|
|
|
|
|
24502501
|
Small Bore
Cast Iron V8 Racing Block |
|
|
|
|
This Bow Tie bare block is intended for serious
competition applications right out of the box. This
block is "CNC" machined from a raw casting P/N 10051182.
All traditional racing modifications are provided by the
factory. The heart of this block starts with a non-siamesed
cylinder case raw casting P/N 10051182 at a 3.875" bore,
but can be bored to 4.030". This case is then
blueprinted on the cylinder decks (9.025" deck height),
front of case, rear of case, and oil pan rail surfaces
as well as the head dowel locator pin locations. In
addition, all galleries required for dry sump oil system
operation are oversize and tapped for pipe plugs. 8620
steel bearing caps are installed on all locations on the
block. The intermediate main bearing caps have the outer
7/16" diameter studs installed at a 20 degree splay,
while the front bearing cap has 7/16" diameter studs on
the inner locations and 3/8" diameter straight bolts on
the outer locations. The rear bearing cap is a 2 stud
(7/16" dia.) configuration and utilizes a two piece rear
seal design adaptable to the one piece design. After
installation of the steel bearing caps, the block is
align bored. Use cam bearing kit P/N 12370843. They are
2.00" O.D. and 1.867" I.D. |
|
|
Technical Notes: The above bore sizes are after
honing .005" from the cylinder by a professional engine
builder. Special features are: Priority main oiling;
Bearing cap inner bolts spread .210 to allow use of
"2.65" dia. journal cranks on properly modified blocks;
Sonic bore check (data provided); Enlarged cam bosses
front and rear to allow use of larger bearings; Enlarged
lifter bosses; Production .842" lifter bores; Early
model two-piece rear main seals; Uses pre-1986 oil pans;
Uses premium quality studs and 8620 20º steel splayed
main bearing caps; and Billet wet sump rear main cap can
be adapted to dry sump with plugs.
|
|
|
|
|
|
|
|
24502503
|
4.00" Bore
Cast Iron Racing Bow Tie Bare Block |
|
|
|
|
This block is "CNC" machined from a raw casting P/N
10051184. All traditional racing modifications are
provided by the factory. The heart of this block starts
with a siamesed bore cylinder case at a 3.995" bore, but
can be bored to 4.155". This case is then blueprinted on
the cylinder decks (9.025" deck height), front of case,
rear of case, and oil pan rail surfaces as well as the
head dowel locator pin locations. In addition all
galleries required for dry sump oil system operation are
drilled and tapped for pipe. 8620 steel bearing caps are
installed on all locations on the block. The
intermediate main bearing caps have the outer 7/16"
diameter studs installed at a 20º splay, while the front
bearing cap has 7/16" diameter studs on the inner
locations and 3/8" diameter straight bolts on the outer
locations. The rear bearing cap is a two- stud (7/16"
dia.) configuration and utilizes a two-piece rear seal
design. After installation of the steel bearing caps,
the block is align bored. Use cam bearing kit P/N
12370843 only. |
|
|
Technical Notes: The above bore sizes are after
honing .005" from the cylinder by a professional engine
builder. Special features are: Priority main oiling;
Bearing cap inner bolts spread .210 to allow use of
"2.65" dia. journal cranks on properly modified blocks;
Sonic bore check (data provided); Enlarged cam bosses
front and rear to allow use of larger bearings; Enlarged
lifter bosses; Early model two-piece rear main seals;
Uses pre-1986 oil pans; and Uses premium quality studs
and 8620 20º steel splayed main bearing caps.
|
|
|
|
|
|
|
|
24502525
|
Bow Tie CNC
Racing Block Tall Deck |
|
|
|
|
This is the same as racing bare block P/N 24502503
except is has higher deck height - 9.150, but can be
machined to standard 9.025" deck height. It can be bored
to 4.155". |
|
| |
|
|
|
|
|
|
|
24502600
|
SB2 / SB2.2
Bare Block |
|
|
|
|
This "CNC machined" bare block uses bow tie casting P/N
10051184 and is machined identically to block P/N
24502503 except the lifter bore locations have been
revised to match the SB2 or SB2.2 cylinder head.
|
|
|
Technical Notes: Production blocks can be used if
offset roller rockers and roller tappets are used. Must
use special camshaft when using SB2 or SB2.2 cylinder
heads. |
|
|
|
|
|
|
|
24502650
|
Bow Tie CNC
Racing Block "Short Deck" |
|
|
|
|
This “CNC machined” cast iron bow tie block has an deck
height that starts at 8.300" and can be machined to
3.400", compared to the standard block's 9.025" deck
height. This block is designed for small cubic inch
engines used in drag racing, road racing, or restricted
oval track racing. The factory bore on this siamesed
block is 3.980" and can be bored to a maximum of 4.190"
with a minimum cylinder wall thickness of .250". The
camshaft has been raised up to 4.953" to use belt style
timing drives. A priority main oiling system is designed
into the block and significant changes in the oiling
system ensure uniform lifter gallery oil feeding as well
as integral lifter oil restrictors. The water pump holes
are spread and a big block water pump must be used. When
a 6" or larger damper is used, the pump must be raised
with aluminum adapters. With the shorter deck, the
pushrods must be shorter to mate with the cam and
lifters. The main bearing diameters are 2.30", not the
standard 2.45". The cam bearing holes are bored for
roller bearings at 2.250" diameter O.D. x 1.875" I.D.
This block features five steel main caps with the three
center caps splayed at 20°, and the block weight is
approximately 167 lbs. |
|
|
Technical Notes: This block uses the Oldsmobile
Aurora V8 design bell housing with a flywheel maximum
diameter of 12.25" . These blocks also use early style
two-piece rear oil seals and oil pans. The lifter bosses
are .220" taller than production blocks. These blocks
will accept all V8 cylinder heads. The oil filter boss
is a machined pad for a remote oil filter adapter — or
tap for a fitting. The block uses a dry sump oil system
only and has provisions for an integral lifter valley
scavenge system. Oil is scavenged through a hole at the
rear of the valley. This block does not have a manual
fuel pump boss, but it features bosses for cylinder
pressure transducers for development testing.
|
|
| |
|
|
|
|
12480050
|
Medium Deck
Height Truck Racing Block |
|
|
|
|
This medium deck height iron block was designed for
"Truck Pro Stock Racing" with the following features:
|
|
|
Technical Notes: 8.700" deck height that can be
machined to 8.500" Has standard Chevrolet bell housing
bolt pattern
Delivered with 3.900" cylinder bore and can be bored to
4.190"Uses jesel style timing belt system (4.953 cam
to crank)
Has no lifter holes or cylinder head bolt 2.300 main
bearing diameter and 2.250" cam bearingAll other
diameters are same as block P/N 24502650 |
|
| |
|
|
|
|
12480157
|
Block, Bow-Tie
Sportsman "350 Main Size" |
|
|
|
|
This iron block is fully CNC machined from the H-D
10051184 casting. It has siamesed cylinder walls, cast
nodular caps, four bolts on all five main caps; the
outer bolts on the three center main caps are splayed 20
degrees. Grade 8 bolts secure the caps. It features
priority main oiling and 9.025" deck height. The blocks
come finished bored at 4.117" and the maximum
recommended bore is 4.150". This block features a
two-piece rear main seal; "350" main size (2.45"). It
features lifter bore heights (.842"), same as P/N
24502503. |
|
|
Technical Notes: It may be necessary to clearance
top of lifter bores with some roller lifters. The block
requires 2" O.D. cam bearings at all five locations (P/N
12370843 set). |
|
| |
|
|
|
|
12480159
|
Block, Bow-Tie
Sportsman "400 Main Size" |
|
|
|
|
This iron block is fully CNC machined from the H-D
10051184 casting. It has siamesed cylinder walls, cast
nodular caps, four bolts on all five main caps; the
outer bolts on the three center main caps are splayed 20
degrees. Grade 8 bolts secure the caps. It features
priority main oiling and 9.025" deck height. The blocks
come finished bored at 4.117" and the maximum
recommended bore is 4.155". This block features a
two-piece rear main seal; “400” main size (2.65"). It
features lifter bore heights (.842"), same as
P/N 24502503. |
|
|
Technical Notes: It may be necessary to clearance
top of lifter bores with some roller lifters. The block
requires 2" O.D. cam bearings at all five locations
(P/N 12370843 set). |
|
| |
|
|
|
|
12551366
|
"Gen 3" 6.0L
Bare Block |
|
|
|
|
This "Gen 3" cast iron 6.0L block is used on 1998-2001
pickup trucks. |
|
|
Technical Notes: Use with casting P/N 12561168.
|
|
| |
|
|
|
|
12561166
|
LS1 or LS6
Corvette Bare Block |
|
|
|
|
This aluminum block is used on th 2001 LS6 Corvette.
|
|
|
Technical Notes: Use with casting P/N 12561168.
|
|
