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Scat Connecting Rod Selection

Scat Connecting Rod Selection

Rod selection for this build was fundamental.  Just as we went with a heavier duty option for the crankshaft for durability reasons, we matched that move with Scat’s Pro Sport 4340 forged H-beam connecting rods (PN 6653522A) with doweled cap alignment and  a 7/16-inch ARP 2000 rod bolt upgrade.

Scat H-beam connecting rodThese are the bad boys of Scat’s rod selection, specifically configured for nitrous and supercharged applications so we were confident they would stand up to the long extended runs we had planned for them. The A suffix on the part number indicates the bolt upgrade.  These rods fit standard 2.200-inch crank pins and accept standard .990-inch diameter wrist pins. The 7/16 x 1.800 ARP 2000 rod bolts are rated at 220,000 lbs. clamping force.

We selected a rod length of 6.535-inch; longer than stock, but only about halfway between stock length and the maximum available length. We specified a longer rod for extended high rpm efficiency and would have gone even longer if the planned rpm had been higher than the anticipated 7500 RPM. The benefits are small, but the rod length was chosen to help pull the torque peak and the power peak closer together minimizing the RPM drop on gear changes.


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Scat H-beam rod big end

Scat contracts with ARP to manufacture rod bolts specific to their connecting rods, hence the Scat identifier seen on the bolt head.

Scat H-beam rod bolt tech

Bolts specific to the rod design fit properly. The bolt provides maximum clamping force using all available material without compromise.

 
Scat ARP 2000 rod bolt

ARP 2000 bolts are an upgrade from the standard bolt which is also fully rated for the rod’s application. We consider them good insurance.

 
Scat H-beam rod small end

Bolts specific to the rod design fit properly. The bolt provides maximum clamping force using all available material without compromise.

 
Scat doweled rod caps

Scat’s premium H-beam rods feature doweled caps to ensure perfect alignment under all operating conditions.

 
Rod and Piston combo

Final reciprocating assembly minus the ring pack includes Ross 14.5:1 CR pistons with pin buttons to accommodate the raised ring pack location. Calico coated rod bearings are also part of the equation.