2.8 cologne unleaded question

[brian c]

Hi all, new member here with a question. According to Burton performance 2.8 v6 cyl heads stamped with a D or E can run on unleaded, my heads are stamped with EN are these unleaded ? The car is a 1983 280i fhc. Thanks Brian.

[MJG280]

This is what was written previously on here

From '85 Ford fitted unleaded heads. If the head has hex head bolts then it is not unleaded as the unleaded heads have internal torqx bolts.

LH side of the engine block, towards the front, you will find the engine number. Nearby is the type code and for a 2.8i it's PR. If there's also a D or an E stamped on the cylinder head exhaust flange upper face near the middle spark plug, it's unleaded.

It is easy to confuse this with the TVR engine number and code which are located on one of the 4 upper flange faces and may also contain a letter D. The engine number is typically below the engine code, which also causes some confusion. Check both sides to ensure that both heads are unleaded friendly.

The TVR engine number should contain the letters WPP and, from 1985, also has the letter D added.

[Wedg1e]

From memory, the unleaded-ready engine I fitted to my Tasmin (ex-1985 XR4i) was stamped 'PR E' above the engine number.