Rob E
Member
Registered: 1st Jan 06
Location: Madeley, Stafford....I want to live back in Wales!
User status: Offline
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I know they are renown for going porus but have also heard they can be sleeved to prevent them going porus... Can anyone on here confirm that?
I have been offered an engine/box/loom etc for a good price but its a non coscast head by the sounds of things. I'm just wondering if in the long run its worthpaying a bit more for an engine with a coscast head
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bubble
Member
Registered: 24th Jan 04
Location: Darwin, NT Australia.
User status: Offline
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can have a brass insert placed into the coolant channel with stops it going porous.
about £150 to do reasonably
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Rob E
Member
Registered: 1st Jan 06
Location: Madeley, Stafford....I want to live back in Wales!
User status: Offline
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yeah thats right. I dont know weather its worth having it done or just buying a coscast engine. Is there any way of checking this coolant channel without removing the head? (the engine is out of the car and hasnt been run in about 12months or so)
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Simon_16v
Member
Registered: 14th Aug 06
Location: Yorkshire
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Has there not been a few cases of coscast heads going porous too? Coscast heads aren't as likely to go porous iirc
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Jambo
Member
Registered: 8th Sep 01
Location: Maidenhead, Drives: VXR Arctic
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IIRC its all hogwash, the coscast heads just as likely to go porous.
Someone confirm?
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Ste L
Member
Registered: 3rd Jul 06
Location: Manchester Drives: 106 16v Rallye
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quote:
Originally posted by Jambo
IIRC its all hogwash, the coscast heads just as likely to go porous.
Someone confirm?
i dont know why people call it "porous" as it isn't..
it's a small hairlight crack between the water and oil ways
the reason it happen's on gm head more often, if they are made of softer metal, and usually it happen's when over tighening the head bolt's - this is the reason why vauxhall revised the angle torque setting on the bolt's for gm heads...
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Jordan C
Member
Registered: 3rd Dec 07
Location: Dundee City Drives: Valver Corsa
User status: Offline
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i dont know why people call it "porous" as it isn't..
it's a small hairlight crack between the water and oil ways
the reason it happen's on gm head more often, if they are made of softer metal, and usually it happen's when over tighening the head bolt's - this is the reason why vauxhall revised the angle torque setting on the bolt's for gm heads...
Just exactly!
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willay
Moderator
Organiser: South East, National Events
Premium Member
Registered: 10th Nov 02
Location: Roydon, Essex
User status: Offline
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£150 to sleve a head to help prevent it going prous, i had this done on my 20XE.
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willay
Moderator
Organiser: South East, National Events
Premium Member
Registered: 10th Nov 02
Location: Roydon, Essex
User status: Offline
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quote:
Originally posted by Jambo
IIRC its all hogwash, the coscast heads just as likely to go porous.
Someone confirm?
less likely, they arent bulletproof iirc
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Rob E
Member
Registered: 1st Jan 06
Location: Madeley, Stafford....I want to live back in Wales!
User status: Offline
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good to hear, ive been hearing some strange stories about the engine in question, sounds like its been ragged to death. Probably best to steer clear!
Thanks for your input everyone 
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