Superspec with Rover engines
All our engines are fuel injection, with or without turbos, and were manufactured between 1993 & 1994.
You should be able to find your engine number on the V5. If it isn't there it is stamped on the block under the No4 (rearmost) exhaust port. It will be of the form 20T4xxxx yyyyy. The '20' shows it is 2000cc, the 'T4' means it is a T16 engine with 4 valves/cylinder and the xxxx tells us what car it was originally destined for.
All engines from number #101828 are fitted with the 1994/5 update which was designed to reduce tolerances and reduce oil leaks from the cylinder head. These engines are known as the 1994 1/2 model and applies to most (but not all) of our engines. The update consisted of:
1. Carbon break valves fitted
2. Shorter valve guides.
3. Shorter black valve stem oil seals fitted (Older engines have longer green oil seals)
In addition, from Engine number #128817 the composite head gasket was replaced with an Multi-Layer-Steel (MLS) gasket, and the oil restrictor was removed.
So the important thing to note is that if you ever need to a top end overhaul, make sure you get the kit with the proper valve seals and gasket.
Just for completeness, from Engine number #135751 the distributer was removed and replaced with the wasted spark system, the 2-gap flywheel was changed to 4-gap and the MEMS was updated to 1.9. But all our engines are older than that, which probably confirms that Robin Hood Engineering bought a 'bin end' of the engines that Rover did not need after the upgrade.
Note that engines destined for card fitted with air conditioning have the alternator mounted underneath the water pump, whereas the normal mount is above the water pump.
Finally, most engines are fitted with cast iron sumps, although some that were destined to go into the Rover 800 series are fitted with alloy sumps. You can check which you have by using a magnet.