Hi-Torque conrod design may fit a Rocket with mods.

Ishrub

That's my name ....built like a truck
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These rods have been designed and tested on a GM V8 motor with similar/same piston dimensions to our Rockets.
The company has only developed the rods as drop-in replacements for 5.3- and 6.2-liter LS V8 engines from General Motors thus far.
Some possible downsides for peak HP though apparently but a good read anyway.

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Transcend says its two-piece Thunder Rods replace standard connecting rods, and deliver a huge whack of additional low-end torque while eliminating piston rock
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Transcend says its Thunder Rods deliver a dramatic increase in engine torque, by adding an extra pivot to the connecting rods
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Saddles in the sides of the upper section of the Thunder Rods actively engage the sides of the piston skirt when installed.

The company has only developed the rods as drop-in replacements for 5.3- and 6.2-liter LS V8 engines from General Motors thus far. In its own testing, Transcend says it was able to tune the 5.3 to match the torque output of the stock 6.2 – a leap of around 30% – between 1,500 and 3,500 rpm. Static compression in the 6.2-liter engine was raised from 155 psi to 198 psi, and the Thunder Rod-modified motor peaked at 32 degrees of timing, where the standard unit is best around 26 degrees.

Transcend says that while the LS is a popular drop-in engine for tuners, it's not optimized to take maximal advantage of the Thunder Rod design, and eventually the company hopes to see what it can do with purpose-designed cranks, cylinder heads and pistons.

While Transcend is confident, many are not convinced, particularly given the current lack of third-party testing and the paucity of results presented by the company. The two-piece con rods are heavier than standard items, creating additional inertial forces that will increase substantially as the engine revs faster, so there's a good chance that even if there are low-end gains, they might come at the expense of high-RPM horsepower.
And the design would also appear to create extra lateral force on the pistons, since the lower pivot point and shorter main arm make the angle between the con rod and the cylinder bore even greater. Not only that, but the distance between the main gudgeon pin and the new, lower pivot now effectively appears to become a torque arm that'll amplify the forces making the piston want to tilt.

 
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