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gt40 heads 

 

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 Post subject: gt40 heads
Posted: Sat Aug 27, 2005 8:24 pm 
Oompa Loompa
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:?: Does anyone now what the diffrenc is betwen cast iron gt40 heads and the alloy ones (other than the material there made of) and can they flow the same :?:
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Posted: Sat Aug 27, 2005 8:48 pm 
Getting Side Ways
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Same basic design, the alloys flow a little better out of the box. There are also a number of different versions, in cast there is the GT40 and GT40P's while in alloy there are GT40Y and GT40X's.

Flow specs are: (intake/exhaust cfm)
GT40 - 192/128
GT40P - 198/139
GT40Y - 213/134
GT40X - 226/161

The GT40 and GT40P's can be ported fairly easily and can flow similar specs to the alloys, I have a set of ported GT40P's which flow 235/175 cfm and there is still probably a bit left in them.
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Posted: Sat Aug 27, 2005 9:08 pm 
Getting Side Ways
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So how easy are the X and Y heads to obtain compared to the cost of porting a set of P's?

 

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Posted: Sat Aug 27, 2005 10:49 pm 
Getting Side Ways
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By the time you buy and port the GT40P's you will probably have spent the same as getting some of the GT40X's over from the US (around $2k I would imagine). But if you need that sort of flow I would be looking at a set of Edelbrock, Trickflow or AFR alloys.
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Posted: Sun Sep 04, 2005 11:22 am 
Tyre Shredder
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The x303's can be bought for 2200 up here in QLD at raceparts australia.

If you want y303's a mate of mine might be selling some for about 1700-1800...i think its about that

 

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