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To confirm to drivers that alongside the current rule:-
“Mandatory inlet manifold supplied by Spedeworth may not be modified internally.
Standard manifold to head casting gasket or silicone based sealer may be used to seal face to cylinder head only. At any point in time Spedeworth can introduce the fitment of a restrictor plate fitted between manifold and carburettor mounting plate of any given size if it is deemed suitable to reduce the output of any engine at any time before during or after any practise, testing or racing.”
The Ford Zetec E 2XDCOE 65mm FZ663A may be used, which can be purchased from Burton Power.
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