Tom Silsbury's 56 Oval Sunroof

The car

Tom's car has a 4" narrow king and link pin beam with recessed bodywork. Dropped spindles are fitted with cross-drilled disc brakes drilled to Porsche pattern.

The engine and gearbox are solid mounted using Bugpack solid mountings (with Funkenblitz CDS tube support bars to rear seat area). A VW Speedshop intermediate mount is used, with the rubber mounts replaced with Funkenblitz engineered aluminium blocks. No traction bar is required with this setup. Gears are shifted by a Gene Berg locking shifter.

Engine breathing is handled by a CSP breather box mounted under the rear seat area.

The engine is monitored by a full set of Autometer gauges (5" Monster Tach, 2 1/16" oil temp, oil pressure, cylinder head temp). Simpson harnesses are fitted.

Avo coil-overs are fitted to the rear suspension, with Spax adjustables to the front. Front and rear uprated anti-roll bars are also fitted. A Hurst line lock is fitted for doing those smokey burn-outs.

Tom's plans over the winter are to remove the engine to fit a fresh set of Bugpack 1 3/8" valve springs and remove gearbox and fit short race axles and axle tubes in order to fit a CB Performance Porsche pattern rear disc brake seup kit. The shorter axles will enable him to use Erco race-weight rear wheels fitted with M&H treaded slicks.

Hopefully the improved traction will allow him to improve on is 13.4 second best 1/4 mile time, set on 7-year old Yokohama 205/65/15s.

Engine specification (2276cc)

Case	Rimco Race Case, clearanced, bored 94mm, shuffle-pinned, drilled and tapped for full-flow oiling.
Crank	CB Performance 82mm stroke Chromoly, counter-weight, 8 dowel.
Flywheel	Scat Chromoly 12lb.
Clutch	Kennedy stage-2 pressure plate, Daiken heavy duty friction disc.
Rods	CB Performance 5.4" Chromoly H-beam.
Cylinders/Pistons	Mahle 94mm, Total Seal rings, Tru-Arc clips.
Heads	CB Performance Street Eliminator, 44x37.5 valves, Scat dual springs.
Compression	10.2:1
Cam	Web-Cam 86C
Followers	Scat Lube-a-Lobe.
Pushrods	Manton heavy duty.
Rockers	Autocraft 1.4:1 roller tip.
Oil pump	Berg 30mm with Berg relief cover.
Oil system	Full flow with thermostat and Mesa fan assisted remote cooler. Berg "wide" deep sump.
Carbs	Weber 48IDAs, 42mm venturis, tall Skat-Trak manifolds.
Fuel system	Holley blue pump with regulator, 0.5" fuel line, enlarged fuel tank outlet.
Exhaust	Stainless 1 3/4" merged header, 3" Magnaflow box.
Ignition	MSD distributor, MSD 6AL control box, Taylor leads, Launch RPM control module.
Other	VW Speedshop welded fan.

Gearbox specifications (Rancho Pro-Drag)

Case	Stock welded and gussetted.
Ring & pinion	3.88:1, Bugpack Super Diff.
1st	3.78:1
2nd	2.21:1
3rd	1.58:1
4th	1.21:1
Axles	Swayaway long race axles.
Other	Erco Chromoly main shaft, Chromoly pinion retainer, Timken pinion bearing conversion, Steel shift forks, heavy duty steel caged bearings.