Spool - Toyota JZ Billet Main Caps

The 1JZ / 2JZ Spool Billet main caps are an excellent upgrade choice when pushing the limits of the JZ platform. These caps have more material than factory to absorb the extra stress more horsepower applies to the crankshaft. When considering high horsepower or more reliability these billet cam caps are a must. 

These billet caps combined with ARP Main studs will enhance bottom end strength and block rigidity for serious boost and power.

It is recommended to use either ARP 8740 203-5405 Studs in mild set ups. If high horsepower and reliability is a must, pair these with ARP/Real St CA625+ RS02-0003 Studs. 

*Tunnel boring and cap facing is required.