Is this an unleaded head?

**AntonyRS** · 27-10-2020, 11:25

Hi, i have had a good read of a few threads but see conflicting info. Can anybody confirm if this is/is not an unleaded friendly cylinder head? I think it is an injection head judging by the inlet ports, it is stamped I by number 4 plug and has 86 cast into the top. Thanks!

https://ibb.co/pfYW2jS
https://ibb.co/jbwCKsv
https://ibb.co/JmssWM8
https://ibb.co/Jx0SGDT
https://ibb.co/5cgLY2D

**katana** · 27-10-2020, 16:42

Injection head - i'd agree but the exhaust seats don't look like there are inserts - just machined casting which implies not for unleaded fuel.......but i'm no cylinder head expert!

**AntonyRS** · 27-10-2020, 21:09

Exactly what I thought. I've got it booked in with an engine builder now as further inspection found the seats to be quite pitted and the guides don't look too clever.

**stevieturbo** · 31-10-2020, 19:54

Definitely just a bog standard head with no seats installed.

It could well last a very long time regardless...but best to get it done by a competent machine shop when it's apart