ARC +.040" long rod to utilize the Harbor Freight Hemi Predator flat top piston(DJ-1285PH) in a Non-Hemi Predator engine (WILL NOT WORK IN HEMI BLOCK). 3.343" center to center for a 1.188" crank pin and a .709" wrist pin. Built from 7075-T651 aircraft grade aluminum. Uses ARC's custom manufactured bearing inserts and ARP rod bolts manufactured specifically for ARC. Our rods have the only forced oiling scoop dipper rods available for these engines providing superior lubrication at the bearing journal.
Rod bolt torque: 170 Inch/lbs lubricated
***Will Not fit the Honda GX200 or Clone 196cc engines***
***Not recommended for use in the Hemi engine***
To install your ARC rod you will need a 12 point 1/4" socket and a QUALITY inch pound torque wrench. You will need an outside micrometer, dial bore gauge or plasti gauge, and motor oil.
Measure the crank pin diameter with the outside mic, it should measure 1.188-1.1875". Measure in several spots to insure roundness. If larger than 1.188", crank journal should be polished down to spec. If journal is out of round more than .0005" it probably should be replaced. The crank pin finish should be smooth to the touch.
When disassembling the rod notice on the side of the rod with the part number there are two dots next to the separation point of the beam and cap (some older rods don't have dots). These dots help to re-orientate the cap and beam when assembled. The side of the rod with the part number engraved will always face the side cover, and all oiling holes in the rod will face the cam.
Make sure the bearing and rod serrations are clean. Install the bearings by lining up the tangs on the bearing with the cut outs on the rod. Lubricate the rod bolt threads with straight motor oil and hand tighten the bolts. Using the torque wrench and 12 point 1/4" socket tighten the bolts to 60" Inch/lbs. Alternate each side to increase the torque by 20" lbs at a time until you reach 150" Inch/lbs. This helps seat the rod bearing especially on a new rod. Measure the bore with your dial bore gauge opposite the parting lines. If using plasti gauge you will have to install the rod on the crank and use in accordance the plasti gauge instructions.
The rod bore should measure 1.191" +/.0005". With plasti gauge you are looking for about .003" total oil clearance. From .0025-.0035" clearance is acceptable. Anything outside that dimension please call 800-521-3560 for recommendation.
Once clearance is set apply motor oil to rod bolts, bearings, crank journal, and wrist pin. Then install.
Do Not use sticky automotive assembly lube, always use the oil you plan to run in the engine as assembly lube for all internal parts.
Final rod bolt torque is 170"Inch/lbs.
Improperly torqueing rod bolts is one of the most common causes of rod failure.
Refer to instructions shipped with all rods and the video below for more detailed instructions.
6 Reviews Hide Reviews Show Reviews
Still assembling parts for a Stg. 3 / Stage 4 type build.
use this rod on all my 212's it puts the piston at about 0 deck height
used with a stock hemi piston in a non hemi block.. gave me .001 in the hole … used with a 265 predator cam and HP .18 gasket 7800rpm baby yeah
Fantastic quality, I have never seen a billet rod like this one before. Clearances were perfect, no issues hitting anything inside, bolts torqued in with oil very nicely. The installation instructions were very easy to follow. If you have a Non Hemi Predator 212, get this rod and the Hemi flat top piston. Makes this engine come alive! Thanks ARC!
The HF non hemi block needs to be clearanced to fit this rod correctly
For the money, this can't be beat. I have two ARC Billet rods in two HF engines and they have done their job very well. These engines see the 6 and 7 thousand RPM range and are still going strong in their second summer of fun. The machine work on these are spot on and if you plan to spin up your HF engine, I suggest you try one of these.