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May 25, 2018
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S P E C I F I C A T I O N S :

Cylinder Head:

• New chill-cast camshafts with high performance profiles:

– Intake Lift = 0.466” Duration 252 @ 0.050”
– Exhaust Lift = 0.426” Duration 248 @ 0.050”

• Large, 37mm Flat tappet Cam Followers, which run in the aluminum without the requirement for a bucket bore

• Ferrea® stainless steel valves sized to the 4.7 liter displacement:

– Intake 1.950”
– Exhaust 1.562”

• Nano material valve seat CNC radial cut & blended to runner bowls
                                                Read More

Twin Spark Ignition:

• RG Twin Spark distributor with hall effect sensor for crank position detection
• Preprogramed Spark Controller with MAP sensing
• Temperature sensor & Fan control relay
• Two Bosch coils with separate Bosch coil ignitors
• Wiring harness that conceals Spark Control unit inside left door hinge cavity

4.7 Stroker Kit:

RG truly believes that anyone rebuilding a 4.2 liter Jaguar XK6 engine should seriously consider stroking their engine – if they can afford to.  It makes a HUGE difference in driving experience!  When you stop to consider that pistons are expendable and that connecting rods and crankshafts must be reconditioned at a substantial cost to properly rebuild an XK’s bottom end, converting to a Stroker engine is not much more expense.

Each component in the kit is designed to work with the other components to yield the very finest stroker kit available. The RG Stroker crankshaft is unique from other 4.7 liter crankshafts on the market.  It uses Chevrolet “Clevite” Small Block rod bearings instead of the standard Jaguar rod bearings to reduce rotating mass.  Lower rotating mass means higher safe RPM operating range:

  • Forged piston & rod castings designed as high performance replacements for heavier original parts
  • Rods use Small Block Chevrolet “Clevite” bearings to reduce crankshaft rotating mass and connecting rod mass
  • Standard Jaguar connecting rods cannot be used with the RG stroker crankshaft
  • Pistons will yield a 10:1 compression ratio with RG cylinder head
  • RG Stroker crankshaft is made from S7 tool steel on state of the art CNC machine in the USA
  • Rod journals are hollowed to reduce rotating mass
  • Counterweights are balanced to lower mass connecting rods and pistons
  • Rear main journal has been machined to fit a modern rear seal to reduce oil leaking
  • Rear seal adaptor is included

S P E C I F I C A T I O N S :

Cylinder Head:

• New chill cast camshafts with high performance profiles:

– Intake Lift = 0.466” Duration 252 @ 0.050”
– Exhaust Lift = 0.426” Duration 248 @ 0.050”

• Large, 37mm Flat tappet Cam Followers, which run in the aluminum without the requirement for a bucket bore
• Ferrea® stainless steel valves sized to the 4.2 liter displacement:

– Intake 1.875”
– Exhaust 1.562”

• Nano material valve seat CNC radial cut & blended to runner bowls
                                                Read More

Twin Spark Ignition:

• RG Twin Spark distributor with hall effect sensor for crank position detection
• Preprogramed Spark Controller with MAP sensing
• Temperature sensor & Fan control relay
• Two Bosch coils with separate Bosch coil ignitors
• Wiring harness that conceals Spark Control unit inside left door hinge cavity

Optional CP‐Carrillo® Connecting Rod Set:

Going to high grade forged CP‐Carrillo® connecting rods makes higher safe RPM possible. Higher RPM allows the engine to extract more potential from the RG cylinder head. When upgrading these components, it is advisable to recondition the OEM crankshaft and to have it nitride finished.

• Forged rod castings designed as high performance replacements for heavier original parts
• Rods designed to connect to OEM crankshaft
• Pistons will yield a 10:1 compression ratio with RG cylinder head (as will original Jaguar “9:1” pistons)

S P E C I F I C A T I O N S :

Cylinder Head:

• New chill cast camshafts with high performance profiles:

– Intake Lift = 0.466” Duration 252 @ 0.050”
– Exhaust Lift = 0.426” Duration 248 @ 0.050”

• Large, 37mm Flat tappet Cam Followers, which run in the aluminum without the requirement for a bucket bore
• Ferrea® stainless steel valves sized to the 3.8 liter displacement:

– Intake 1.875”
– Exhaust 1.562”

• Nano material valve seat CNC radial cut & blended to runner bowls
                                                Read More

Piston Set:

• Universal forged CP‐Carrillo® piston for all bores – lighter than originals
• Piston accepts standard Jaguar connecting rod
• Piston profile produces 10:1 compression ratio when used with RG 3.8 liter cylinder head

Twin Spark Ignition:

• RG Twin Spark distributor with hall effect sensor for crank position detection
• Preprogramed Spark Controller with MAP sensing
• Temperature sensor & Fan control relay
• Two Bosch coils with separate Bosch coil ignitors
• Wiring harness that conceals Spark Control unit inside left door hinge cavity

Optional CP‐Carrillo® Connecting Rod Set:

Going to high grade forged CP‐Carrillo® connecting rods makes higher safe RPM possible. Higher RPM allows the engine to extract more potential from the RG cylinder head. When upgrading these components, it is advisable to recondition the OEM crankshaft and to have it nitride finished.

• Forged rod castings designed as high performance replacements for heavier original parts
• Lightweight forged connecting rods fit to OEM crankshaft