Spool XR6 forged connecting rods and ROSS Racing pistons.

This Package includes:

• Spool Forged H Beam Conrods (ARP 2000 3/8 Bolts)
• Custom Ross Racing Forged Pistons (Rings, Pins and Locks)

Ross Racing Pistons Feature:

These Pistons are custom made for Spool and rated at 900-1000hp by Ross Racing Pistons.

• Compression Ratio: OEM Comp Ratio
• Bore Size: +0.001" or +0.25mm
• Pistons come with NPR Gas Nitrided top ring, three pcs. oil
• 4 Valve Pockets
• 0.225” wall Carbon steel
• Forged 2618
• Locks

All of Ross Racing Pistons (since 1985) have been forged from 2618 billet bar stock and have been heat treated and aged to a T61 condition (2618-T61). 2618-T61 is the material that is used when fatigue resistance and durability are of prime importance by all premium racing piston manufacturers.

This material has less than 1% silicon particulate content. High silicon content pistons (forged from 4032 or MS75) will not stand up to the most extreme stress placed on many racing pistons. If a crack starts to form in a high silicon piston it will continue until the piston experiences a catastrophic failure. Simply stated, adding sand to the aluminum only makes it more brittle. In the rare instance of a 2618-T61 piston cracking, the crack will continue to an area where the stress is not as great and will then stop. Another advantage of 2618-T61 over the high silicon pistons is the ability to keep its shape under extreme pressure and high RPM's. "Skirt Shrinking" is not a problem with ROSS Racing Pistons.

Spool Connecting Rods Feature:

• ARP 2000 fasteners (L19 fasteners are available as an upgrade)
• High tensile 4340 forged steel
• 2 Piece forging
• Hardness of HRC36-42
• Dowelled caps for precision alignment
• X-RAY & Sonic tested
• Quenching and heat treated
• Shot peened
• 100% Magnafluxed
• Weight Matched Sets +/- 1 gram
• Vacuum degassed to remove impurities

Product images are for description purposes only. Actual product may vary.