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RB30sx 3.6ltr RB30 Billet Block

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Full specifications

The Bullet RB30Sx (Street Extreme) to suit Nissan RB bolt-up applications is the same as our regular RB30 Billet Block but with a larger main tunnel to accept our larger main bearing custom crankshafts. It has been designed to suit applications producing 2500hp+.

The addition of the larger main shaft increases the strength of the crankshaft and remedies the under engineered RB30 OEM sized crankshaft problems in the high output applications. The large main shaft crankshafts are available in two strokes 90mm & 94.5mm. Capacities up to 3.6 litres can be achieved using the RB30Sx.

Distortion of cylinder bores and crank tunnel is dramatically reduced through design improvements and a Bullet 4 bolt main cap system. This product offers significant weight savings and delivers scope to create large displacement RB engines.

the bullet difference
member resource
Name of product 3.6ltr RB30 Billet Block (Nissan RB applications)
Actual Weight 46kg
Block Material 6061 aircraft grade billet aluminium.
Design improvements 4 bolt mains, increased block deck and cylinder wall thickness. Performance sleeves fitted max bore 90mm & larger main tunnel using the 2Jz bearings.
Studs included ARP 8740 1/2” Head and 7/16” Main
Modifications required to fit Remote Oil Filter & external oil pump. Custom Callies/Bullet Crankshaft.
Modifications to head required Drill out head stud holes to 14mm
HP rating 2500+*
Significant benefits Weight saving, significantly increased rigidity and durability. May be bored to 90mm
Finish Raw machined
Options available Bullet Fire Ring Head Sealing System Wet or Dry Deck available

the bullet difference

head sealing

The optional Bullet Fire Ring head sealing system uses a metallic gasket with grooved brass rings for the cylinders that provide exceptional head sealing under ultra high loads.


Increased deck thickness increases rigidity and stability for better head gasket sealing.


Bullet supply premium studs and block plugs with all billet blocks.


Our blocks are machined from 6061 aircraft-grade billet aluminium, so they are much lighter than cast iron alternatives. Typical weight savings are more than 20kg.


Our unique design incorporates siamese bores, dry sleeves and a one-piece cradle resulting in maximum rigidity. Cylinders stay round and piston rings seal better under high load resulting in more power.

4 bolt mains

Four bolt, billet one piece main cradle improves bottom and rigidity to reduce main tunnel deflection under extreme load. The cradle is made from the same material to ensure equal expansion rates and maintain a  round bearing housing at different temperatures.


Bullet’s registered designs are developed to identify and eliminte structural weaknesses in OEM blocks. They are built to exceptionally precise tolerances for exceptional results.


Cooling system design improvements and efficient fluid paths are a significant feature of the Bullet block.

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