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IAG Performance EJ25, Install Manual

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IAG Performance EJ25 Install Manual Download Page 4

 

IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com 

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Preparing cylinder heads for ½” head studs 

 

 

The larger ½” head studs (threads measure .496”) require 

drilling out the cylinder heads for clearance. Use a 33/64 

or .515” bit to drill out the head stud locations on the 

cylinder head. Make sure the heads are sorted and free of 

debris before installing onto the short block. 

 

 

 

 

 

 

 

 

 

14mm Head Studs Install 

 

 

1.

U

 

14mm Head Studs

U

 - Using 30w engine oil, lubricate the 

studs block end threads and let it sit to drain excess.  Do 

not drop the stud in the hole as it will damage the leading 

thread in the block.   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for EJ25

Page 1: ...rqueing the case bolts 2 U Plug Install U Each plug has a location identifier machined into it that corresponds to the deck surface Please make sure to install the plug into the correct deck hole Example L1 plug installs in L1 deck location Each plug is pre lubed with a moly lubricant This should be adequate to reinstall unless the plug holes or plugs were cleaned and lube has been removed The plu...

Page 2: ...gaged in the correct starting thread It may require rotating the stud counter clockwise to feel The incorrect starting thread may allow up to one turn of engagement and get tight IF UANYU RESISTANCE IS FELT STOP If you experience resistance back out the stud and inspect the threads on both parts clean the threads as needed Try threading it again Studs must be installed with hand tools due to the a...

Page 3: ...ad side threads completely around the circumference not just a dab one side as well as both sides of the flat washer and the flange of the nut Install the cylinder head washers and nuts Head Stud Torque Specs Center Two Outer Four Step 1 30 lb ft 30 lb ft Step 2 70 lb ft 70 lb ft Step 3 110 lb ft 110 lb ft Step 4 125 lb ft 125 lb ft Repeat Step 4 ...

Page 4: ...der heads for clearance Use a 33 64 or 515 bit to drill out the head stud locations on the cylinder head Make sure the heads are sorted and free of debris before installing onto the short block 14mm Head Studs Install 1 U 14mm Head StudsU Using 30w engine oil lubricate the studs block end threads and let it sit to drain excess Do not drop the stud in the hole as it will damage the leading thread i...

Page 5: ...nch is used to tighten the two nuts against one another and to break the nuts free once the stud is torqued in place IF UANYU RESISTANCE IS FELT STOP If you experience resistance back out the stud and inspect the threads on both parts clean the threads as needed Try threading it again Studs must be installed with hand tools due to the amount of thread engagement friction and lubrication 4 Torque t...

Page 6: ...s and nuts 14mm Head Stud Torque Specs for IAG Short Blocks that shipped between 4 11 2018 to 4 19 2018 If your block shipped prior to these dates or after these dates different torque specs are required and there are supporting documents available with those specs http www iagperformance com support a 265 htm Center Two Outer Four Step 1 40 lb ft 30 lb ft Step 2 87 lb ft 70 lb ft Step 3 115 lb ft...

Page 7: ...of wood Create a pilot hole in the substrate using a drill and step bit maxing out the hole to 9 16 2 Place the head gasket on the clean flat substrate lining up each of the x2 center head stud holes to the pilot hole you created Make sure not to dent or bend the head gasket to avoid damage and improper sealing Using the step bit drill out the x2 center head stud locations on the gasket to 9 16 We...

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