GM vs Coscast heads

[Adam]

But one of the main reasons why the XE is such a good engine is the head design by cosworth.

Why tho, afaik, GM heads are just as good as the Coscast ones, apart from going porous.
But no power differences.

[draper]

thats what im now thinking, and if you can get a GM repaired then no point shelling out !!

going to be ringing "cylinder head developments" soon and getting some prices for there work. been reading about them in total vauxhall and im impressed by some of there figures !!

[Ste L]

only reason for power difference, was just the most xe with gm head, usually have the cats, and they sap power

as for the pourous head.. my mate can fix that...
here's his site about it

http://www.orsas.com/CarStuff/cav/

[Adam]

Yep, people see the early XE's have 156bhp, but probably forget that they dont have CATs.

[Tim]

yes its nice to try and blag that you have a piece of cosworth development on your car but hey...[/quote]

dont belive i was bragging, just commented on how pleased i was to have sourced a xe lump with the coscast head for so little money (?150).

if you had the choice which would u prefer to buy?

[Ste L]

the one with less miles on it personally

couldn't care less gm or cos cast head

[Stuart]

^^^ bingo. id buy the one in "best" condition then if it was a gm head id get it repaired beofre fitting as prevention is better than cure


also iirc cosworth didnt design the ehad as such, they had a small hand in it but it was the casting process they messed about with hence coscast....

[draper]

only reason for power difference, was just the most xe with gm head, usually have the cats, and they sap power

as for the pourous head.. my mate can fix that...
here's his site about it

http://www.orsas.com/CarStuff/cav/

brilliant site that ste, cheers

gonna strip mine down at the weekend if i get time and have a good nosey round, will probably get mine reapired before it does/might go pourus