as title says
How To Tell The Difference ?
Started by
minimad01
, Sep 07 2010 12:35 PM
5 replies to this topic
#2
miniobsessed
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Mini Mad
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Posted 07 September 2010 - 01:34 PM
Unleaded heads have hardened exhaust valve seats fitted (as unleaded petrol doesn't have 'lubrication' that leaded petrol offered).
It's usually fairly easy to see if the head has inserts or not. If nothing else you will see a ring around the valve throat where you should see the change between the cast iron and the hardened steel seats.
It's usually fairly easy to see if the head has inserts or not. If nothing else you will see a ring around the valve throat where you should see the change between the cast iron and the hardened steel seats.
#3
minimad01
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Super Mini Mad
Posted 07 September 2010 - 01:37 PM
any pic because im lost :L
#4
miniobsessed
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Posted 07 September 2010 - 01:55 PM
Do you have a picture of the head you are trying to identify?
You'd need a few good quality pictures of the exhaust valve seat and throat area without the valve installed...
You'd need a few good quality pictures of the exhaust valve seat and throat area without the valve installed...
#5
minimad01
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Super Mini Mad
Posted 07 September 2010 - 02:54 PM
so if i take the vavles out ill be able to tell if the head is leaded or not 
#6
josh.evans
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One Carb Or Two?
Posted 07 September 2010 - 03:41 PM
so if i take the vavles out ill be able to tell if the head is leaded or not
yes should see a different colour of metal to re seat the cost is around £80 if it does need new ones
josh
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