• 4JJ1 ARP Head Studs - Common Rail Cowboys
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Common Rail Cowboys

4JJ1 ARP Head Studs

4JJ1 ARP Head Studs

$995.00 NZD
$995.00 NZD
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4JJ1 ARP Head Studs


ARP2000 Performance Cylinder Head Stud Set to suit Isuzu 4JJ1 and 4JX1TC engines.

 There are 18 x studs, 18 washers, and 18 x nuts included in this set.



These ARP2000 head studs are a heavily alloyed martensitic quench hardened and tempered steel that offer a 15% increase in clamping load at around 75% of the studs yield strength and up to an impressive 30.3% increase in clamping load at 85% of the fasteners yield strength!

Yield Strength:
9,108.13 kg
 


Advantages of ARP2000 Head Studs over Standard 4JJ1 head bolts:

 


Increased head clamping force for performance applications - Clamping Load at 75% Fastener Yield Strength) - 6831.1kg
 

A more evenly distributed and accurate torque load compared to that of head bolts 
 

Re-usable (if in spec)

 

What this ultimately translates into an increase in reliability for performance applications and a lower chance of head gasket failure.

Note:  Fitment Information - Modifications Required.

Make sure to use a bottoming tap to tap bolt holes to the bottom, sure to blow out the holes thoroughly and check the thread has cut all the way to the bottom.

The current  design of these studs used under the cams are too long, you will need to shorten the top (hex key end) of 8 studs to ensure they do not prevent the rocker arm shafts from tightening down properly.

Also, you can either leave the washers off these studs (NOT preferred) OR machine these head bolt recesses into the head 3.5 mm deeper (preferable).

Either way, the studs will still need to cut down.

 

This set also includes ARP Ultra-Torque lubricant


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