4G63 DOHC Extreme Force Beehive Springs | KVS63-EXTREME Engine Model_L16 our reasoning for choosing IRP

our reasoning for choosing IRP is as follows:

after much demand for the ultimate solution

with a custom Callies Ultra Billet crank that utilises the larger main bearing size of the Toyota 2JZ

now with the kind of control never seen before

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4G63 DOHC Extreme Force Beehive Springs | KVS63-EXTREME Engine Model_L16 our reasoning for choosing IRPUltimate Valve Spring and Retainer Kit for Drag Racing 4G63 engine Designed for 1650+HP applications 11,000+RPM Not for the faint hearted, ready to break records. Key features: 142lb on the Seat, 292lb open Pac Racing High Frequency Beehive Huge 14mm to coil bind 4340 Black Nitrided Retainer for extra durability 4140 CNC machined seat Intake installs at 39. 5mm 132 lbs. seated, 278lbs at 12mm lift. Exhaust installs at 38. 5mm 142 lbs. seated, 292 lbs.