McWillster
Member
Registered: 23rd Mar 09
Location: Huntly, Aberdeenshire
User status: Offline
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Just recently found out that the redtop i just purchased has the coscast head on it.
Whats the deal with it? Pros and Cons over the GM one? Will this be a desirable aspect when selling the car?
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Ellis
Member
Registered: 11th Sep 07
Location: Aberdeenshire
User status: Offline
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They don't go porous IIRC
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Sam
Moderator
Premium Member
Registered: 24th Dec 99
Location: West Midlands
User status: Offline
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They give you an extra 50bhp.
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McWillster
Member
Registered: 23rd Mar 09
Location: Huntly, Aberdeenshire
User status: Offline
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quote:
Originally posted by Sam
They give you an extra 50bhp.
quality contribution 
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Richardhhha
Member
Registered: 29th Sep 07
Location: Croydon, Greater London
User status: Offline
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they do still go porus but not as common, also they have a better design and have been made from better materials
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alan-g-w
Member
Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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Bigger inlets as well I'm sure.
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Adam_B
Member
Registered: 13th Dec 00
Location: Lancashire
User status: Offline
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You get loads more e-points.
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Daimo B
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Registered: 20th Mar 00
User status: Offline
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quote:
Originally posted by Ellis
They don't go porous IIRC
Lies, just as porous prone as a GM head.
Valve guides are different, something to do with the valves or the inlet ports. Larger than the GM head (hence flowing more air).
Exhaust ports may be different.
Really, theres hardly any difference. Look under Exhaust port 3 for the coscast stamp.
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Graham88
Member
Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
User status: Offline
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You have to take a picture of the badge that says Coscast and post it on your project thread.
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Ellis
Member
Registered: 11th Sep 07
Location: Aberdeenshire
User status: Offline
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quote:
Originally posted by VXR
quote:
Originally posted by Ellis
They don't go porous IIRC
Lies, just as porous prone as a GM head.
Valve guides are different, something to do with the valves or the inlet ports. Larger than the GM head (hence flowing more air).
Exhaust ports may be different.
Really, theres hardly any difference. Look under Exhaust port 3 for the coscast stamp.
I didn't really know tbh, just what I'd heard somewhere. 
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alan-g-w
Member
Registered: 9th Nov 07
Location: Glasgow
User status: Offline
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I've heard that before too Ellis. But tbh I think it's just the fact that there were fewer Coscasts to start with, so there are bound to be less going porous.
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SportBoy
Member
Registered: 5th Oct 01
Location: Retford, Nottinghamshire
User status: Offline
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nothing wrong with a gm head
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Nic Barnes
Member
Registered: 5th Apr 04
Location: nowhere near ginger people
User status: Offline
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quote:
Originally posted by SportBoy
nothing wrong with a gm head
+1
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richc
Member
Registered: 24th Mar 07
Location: Ilkeston
User status: Offline
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quote:
Originally posted by Nic Barnes
quote:
Originally posted by SportBoy
nothing wrong with a gd head
+1
+2
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BluKoo
Member
Registered: 8th Apr 02
Location: Stonehaven (Scotland)
User status: Offline
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quote:
Originally posted by richc
quote:
Originally posted by Nic Barnes
quote:
Originally posted by SportBoy
nothing wrong with a gd head
+1
+2
=4
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SR91
Member
Registered: 21st Jun 08
Location: Lancashire.
User status: Offline
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quote:
Originally posted by BluKoo
quote:
Originally posted by richc
quote:
Originally posted by Nic Barnes
quote:
Originally posted by SportBoy
nothing wrong with good head
+1
+2
=4
-5
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Dale
Member
Registered: 7th Oct 07
Location: Swindon
User status: Offline
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i got GM heads on both my XE's and LET- all ok to me
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gazza808
Member
Registered: 30th Jun 08
Location: Peterborough
User status: Offline
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certain GM heads also have more material to be taken off ,
which is a good thing
[Edited on 07-07-2009 by gazza808]
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McWillster
Member
Registered: 23rd Mar 09
Location: Huntly, Aberdeenshire
User status: Offline
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quote:
Originally posted by Graham88
You have to take a picture of the badge that says Coscast and post it on your project thread.
Dont have a project thread for the conversion. Could take a photo of the stamp and post it up but im sure people dont care that much lol!
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Graham88
Member
Registered: 16th Apr 07
Location: South East Kent Drives: E46 M3
User status: Offline
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Na I'm joking mate, just when ever somebody has a Coscast head they take a photo and put it in their project thread
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lee303
Member
Registered: 1st Jul 08
Location: under the nova usually
User status: Offline
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just an aside, neither actually go 'porous' the oil way in question actually cracks, usually from over tightened head bolts when the head gasket is done, the sleeve mod is easy enough and fixes it pretty permanently
GM heads are fine, especially if you plan to fit larger valves and do port work
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Ste
Premium Member
Registered: 5th Mar 03
Location: Taif, Saudi Arabia
User status: Offline
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quote:
Originally posted by SR-91
quote:
Originally posted by BluKoo
quote:
Originally posted by richc
quote:
Originally posted by Nic Barnes
quote:
Originally posted by SportBoy
nothing wrong with good head
+1
+2
=4
-5
=6
mine has just passed a pressure test with flying colours
I would rather lose by a mile because i built my own car, than win by an inch because someone else built it for me.
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