How to tell a coss cast head? - Corsa Sport - for Vauxhall and Opel Corsa B, Corsa C and Corsa D

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Desmond

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Registered: 7th Jun 00
Location: Rossington, South Yorkshire
User status: Offline

15th Dec 04 at 16:20

As above really, is there a way of telling if the head on a 2L is a coss cast or not from the outside??

willay

Moderator
Organiser: South East, National Events
Premium Member

Registered: 10th Nov 02
Location: Roydon, Essex
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15th Dec 04 at 16:21

take the exhaust manifold off and see if its printed between the holes ? :S

lemme find the google link.

Adam_B

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Registered: 13th Dec 00
Location: Lancashire
User status: Offline

15th Dec 04 at 16:21

will have coscast stamped under one of the exhaust ports, or theres something on the side of the cylinder head.....

Doug_SRi

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Registered: 1st Sep 02
Location: Aberdeen. Drives: Stage 2 Astra VXR and Nova
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15th Dec 04 at 16:22

whats the difference between the two heads?

willay

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Organiser: South East, National Events
Premium Member

Registered: 10th Nov 02
Location: Roydon, Essex
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15th Dec 04 at 16:24

quote:
Originally posted by Desmond
As above really, is there a way of telling if the head on a 2L is a coss cast or not from the outside??

try this

http://www.astra-mk2.com/forum/showthread.php?t=396

willay

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Organiser: South East, National Events
Premium Member

Registered: 10th Nov 02
Location: Roydon, Essex
User status: Offline

15th Dec 04 at 16:25

quote:
Originally posted by Doug_SRi
whats the difference between the two heads?

something to do with the water/oil galleries?...... coscast head is less likely to go poros... I think?

deanmcreynolds26

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Registered: 15th Sep 03
Location: E46 //M3
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15th Dec 04 at 16:37

under exhaust port 3 im sure there is a stamp!

willay

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Organiser: South East, National Events
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Registered: 10th Nov 02
Location: Roydon, Essex
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15th Dec 04 at 16:48

Ditch

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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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15th Dec 04 at 16:51

If its GM.... it will say GM on the right hand side of the block (when looking under the bonnet)

the difference is the way they were made. The Cosscast head was formed with cosworths superior moulding skills, in expensive moulds.... the GM one wasnt!

the "porous" story you so often hear relates to the fact that the GM head is more brittle, and is prone to cracking between cylinders 2 and 3... resulting in the oil and water galleries meeting

Ditch

Member

Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
User status: Offline

15th Dec 04 at 16:54

without taking the thing apart, the best way to tell is the way I described. To look down the right hand side of the block.

A cosscast head has this Z shape: