4 replies to this topic

[welldc]

I have recently bought a 93 Mayfair with 1275 engine and feel the need for more power.

 

I have read the forum threads and get ever more confused. My previous experience is with Ford.

 

Some questions to help me get my head around what fits what:

 

1. I presume mine is an A+ engine, does that have the water by pass and heater take off?

 

2. Are 9 stud and 11 stud interchangeable and what would an A+ normally have?

 

3. I have chance of an MG Metro head. Would this be a straight swap on an A+ and would it be a worthwhile upgrade for normal road use?

 

Many Thanks...............

[Stiggytoo]

If A+ it should have a verto clutch (short arm) among other features.

If you have a 9 stud head, you don't need to worry about 11 stud heads, they have 2 extra holes drilled in them.

I wouldn't change to the MG head unless you know it has bigger valves on it. Depending on what you get, you may want a different carb or needle at the very least. 

Again, has it got a stage 1 kit? This would be the first area to work on.

 

Also, make sure it is tuned well to make the most of what you've got.

Edited by Stiggytoo, 11 January 2014 - 05:13 PM.

[welldc]

Cheers.

 

Plan was to put a Stage one kit on with 1.75 Su and follow that with a head, but the Metro head has just popped up.

 

It already has an LCB but it is small bore, and is currently on a 1.5SU.

 

I wondered if the Metro head was worthwhile as doing the Stage one and head together would save getting it set up twice.

[welldc]

Any more opinions on MG Metro head?

[Cooperman]

If it is the head with the 35.6 mm inlet valves and the 29.5 mm ex. valves then it is a very good head.

Before fitting any different head it is important to measure and calculate the compression ratio then machine the head to provide the C.R. you want.