3 replies to this topic

[woodsy483]

Does anyone know where I can find the exact spec of a stage 3 head, such as valve sizes, porting diameters etc. There is a head for sale locally to me, the guy say's its been ported but does'nt now to what level and he thinks it had been fitted to a 1100 block previously for autograss racing. I need to ensure it is stage 3 as he's asking for a fair price for a stage 3 but too much for a standard head, any info would be greatley appreciated.

[jaydee]

Its on the front page mate
There you go: http://www.theminifo...-engine?start=2

Ask them the full spec (valve size, chambers, etc), because behind the word 'stage 3' there are different specs that may change from one manifacturer to another.

[GraemeC]

There is no such thing as a specification for Stage 3 (or any other stage for that matter).
It is an arbitary reference used by each company making performance heads to say it is a bit btter than their 'stage 2'.

For instance, if I was that way inclined I could sell heads as follows:
Stage 1: Painted a pretty colour
Stage 2: Painted a pretty colour and head surface skimmed
Stage 3: Painted a pretty colour, skimmed and valves re-lapped and new stem seals
etc.

So a Stage 3 head from MED would be much different to mine!!

[biggles1293]

There is no such thing as a specification for Stage 3 (or any other stage for that matter).
It is an arbitary reference used by each company making performance heads to say it is a bit btter than their 'stage 2'.

For instance, if I was that way inclined I could sell heads as follows:
Stage 1: Painted a pretty colour
Stage 2: Painted a pretty colour and head surface skimmed
Stage 3: Painted a pretty colour, skimmed and valves re-lapped and new stem seals
etc.

So a Stage 3 head from MED would be much different to mine!!

A valid point well made Graemec!