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800-826-3045
MAIN BOLTS
MAIN BOLTS
Far superior to any other main bolts available for use in competition engines, ARP
main bolts are designed to meet the exacting standards and demands of professional
engine builders. Forged from 8740 chrome moly steel, all ARP main bolts feature a
reduced wrenching head, large underhead radius and rolled threads for the utmost in
reliability. The threads are rolled after heat-treating which gives them about 2000%
better fatigue strength than most main bolts that are threaded prior to heat-treating.
The popular
High Performance
Series
is rated at 180,000 psi, and is a premium
replacement for OEM fasteners.
Pro Series
main
bolts are application-specific, rated
at 200,000 psi, and designed for use in competition engines. Hardened parallel-ground
washers are included with each kit.
MAIN & HEAD BOLT INSTALLATION
1. Clean and chase all block threads to
ensure maximum thread engagement and
accurate torque readings.
2. Clean and inspect all hardware prior to
installation, looking for shipping damages
and defects.
4. Seal all threads extending into a water
jacket with ARP thread sealer. Lubricate
all threads on dry deck and/or main cap
applications with ARP Ultra-Torque fas-
tener assembly lubricant.
5. Following the engine manufacturer’s
torque sequence, tighten the bolts to the
recommended torque value found on the
instructions provided with each kit
.
3. Install the main caps or head gasket
and head, checking for improper fit, bind-
ing or misalignment. Make sure all mating
surfaces are fully seated. Install the washers
on the bolts with the chamfered side of the
washer located towards the head of each
bolt. Lubricate the washers and the under-
head of the bolts with ARP Ultra-Torque
fastener assembly lubricant.
SPECIAL NOTE:
All wet deck head bolt
applications will require some type of seal-
ant on the bolt threads to prevent coolant
leakage. Always check each application
(import and domestic) prior to installation
to determine whether your application has
a “wet deck” or “dry deck” cylinder block.
Application
High Performance
Pro Series
2-Bolt Main
4-Bolt Main
2-Bolt Main
4-Bolt Main
BMW
S1000RR Motorcycle ARP2000 - Crankcase main bolt kit (29 pcs. with sealing washers)
201-5201
BUICK
V6 Stage I
123-5201
V6 stage II
123-5202
455 cid
125-5201
CHEVROLET, SMALL BLOCK
Large journal - hex nut
134-5001
134-5202
Large journal - 12 pt nut
234-5201
Large journal - with 1/2” straps on front & rear caps
234-5203
Small journal
134-5002
Dart - SHP iron block
134-5204
World - Motown iron block
134-5203
