Spool 4ZE1 Conrod and CP Forged Pistons

Spool 4ZE1 H Beam Forged Conrods and CP Forged Pistons

These custom pistons are available in any bore size and any compression ratio. Turn around time for pistons is generally 6 - 8 weeks 

Pistons come with rings, gudgeon pins and pin locks.

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

CP Pistons standard features include:

5310 gudgeon pins (9310 thicker wall thickness pins are available as an upgrade)

Deep valve reliefs accommodate high lift camshafts

Larger valve reliefs for +1mm valve sizes

Custom skirt cam and barrel design

Accumulator grooves

High strength aluminium forgings

High performance rings

Fully CNC machined and balanced to +/- 1 gram

Wrist pins included

Double pin oilers force fed from oil ring groove

Pick lock grooves for easy lock removal

Pin fitting included

Note: We recommend Joe Gibbs Break in Oil for all new engines.