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What bolts do these conrods use and how should I tighten them?
These rods use ARP conrod bolts, usually ARP2000 as standard with L19 or CA625+ available on some models. ARP2000 bolts are generally torqued to around 55 ft-lb for 3/8 inch and around 75 ft-lb for 7/16 inch when using ARP Ultra-Torque lube. L19 bolts must be tightened by stretch, not torque. Always refer to the latest ARP instructions for exact specifications.
Do these conrods have a horsepower rating or warranty?
No. Like other performance rods, they do not carry a horsepower or performance warranty. Spool warrants workmanship before installation, but once fitted, power handling depends entirely on machining, clearances, tuning, fuel, boost level and rpm.
Do the big end and small end need machining?
They often do. Crank journals and pin bores vary between engines, so your builder should measure the big end oil clearance and small end pin clearance and hone as required before assembly.
What is the material used for the Spool 1FZ-FE conrods?
The Spool 1FZ-FE conrods are made from high tensile 4340 forged steel, which provides excellent strength and durability for high-performance applications.
Are these conrods compatible with all 1FZ-FE engines?
Yes, these conrods are a direct fit for all Toyota Landcruiser 1FZ-FE engines, ensuring proper alignment and fitment.
What kind of testing do these conrods undergo?
Each set of Spool 1FZ-FE conrods is X-RAY and Sonic tested, shot peened, and 100% Magnafluxed to ensure structural integrity and reliability under high stress.
Do I need to perform any modifications before installing these conrods?
While the conrods are designed for direct fitment, it's advisable to check for any necessary machining on the big-end or small-end to accommodate factory tolerances.
What is the weight tolerance for the Spool 1FZ-FE conrod sets?
The conrod sets are weight matched to within ±1 gram, ensuring consistency and balance in the rotating assembly.
