For serious bottom end strength and block rigidity. This kit is as good or better quality as any on the market, but at a more realistic price.

Used in Spool RB34 engines.

Girdles are 250 Grade Mild Steel.

Please note:

Spool Girdles can only be used with the Spool Billet Main Caps (not suitable for use with the OEM girdle).

Custom Oil Pick Up required (not supplied).

Does not come with ARP Main Studs.

Tunnel boring is required.