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Billet alloy rocker cover - 4 cylinder wet liner engine TR2 to Tr4a (1962)


I have commissioned a small batch of billet covers as shown and can offer them to others on a ‘cover the costs basis’. These have been 3D Design developed and prototyped using a professional design and production outfit in the UK and tested for fit and function by me on my own car. The result speaks for itself.

The rocker cover is CNC machined from 6000 series billet aluminium, cover to head sealing is taken care of with a Viton o-ring in a correctly sized groove to ensure the correct compression on fitting which means no oil leakage and suitable for repeated use as the cover comes on and off for top end adjustment. The two hold downs are custom machined in billet as well and also include Viton o-rings to positively seal the fixings again to stop oil seepage.

The oil cap was designed through rapid prototyping to give just the right feel in the hand and be easily used under all operational conditions.  The cap uses and AN-32 ORB to ensure it is also completely sealed.  Two AN-10 ORB take-offs provide flexible breathing options to ensure that blow-by is looked after effectively.

For the finish, to give the look of a period cast cover, we bead blasted the finished machined item and them anodized in black. The cooling fins where then faced to add a bit of contrast to the finished top surface.  All the brightwork is polished and clear anodised for long lasting protection.

I do have some spares in production so all fittings and seals will be available in the event of loss over time (and I’ll be using them on my own cars) and a wide variety of AN fittings are available from usual motorsport parts sources meaning that many top end breathing solutions are possible using proprietary or hand made catch tanks etc.

Lead in time is 8 weeks and the cost price including all seals and fittings as shown Is £550 plus postage to wherever you are.

Numbers are limited.

Send enquiry to Tony Sheach



  • Category: Cars
  • Model: TR4
  • Year: 1962
  • County: Northamptonshire

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