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GT40p heads or AM 

 

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 Post subject: GT40p heads or AM
Posted: Mon Oct 10, 2005 6:45 pm 
Oompa Loompa
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i'm thinking of getting a head job. :wink:

i have an AU2 XR8 with the GT40p heads. i was thinking of either porting these heads or buying aftermarket. i am looking at either Trickflow ($2K) or AFR heads ($2.5K). what do think would be better? would it be worth the extra cost of AM heads?
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Posted: Mon Oct 10, 2005 7:39 pm 
Getting Side Ways
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You will generally have to put at least $1k worth of wok into the GT40P's so they can try and compete with out of the box alloys. If you factor in the cost of porting and that you should be able to sell the GT40P's for around $1k, then the aftermarket alloys aren't all that expensive.

Are you looking at stroking the engine? IMO the GT40P's are a great budget head which flow enough for most 5L combos and even mild strokers IMO unless you are looking at a wild 5L or stroker I would save the money and put it into something else. But it all depends on how much you are willing to spend and what sort of power you want to chase.
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Posted: Mon Oct 10, 2005 7:50 pm 
Oompa Loompa
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Alloy's IMO. Gives you room to grow and you can sell the gt40p's. I ported my gt40p's (mildly) but ended up stroking and forking out for alloy's.

 

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Posted: Mon Oct 10, 2005 10:09 pm 
Getting Side Ways
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I'd like to see someone build a strong motor with a set of these...
http://www.protopline.com/racingaluminumford.htm

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Mon Oct 10, 2005 11:35 pm 
Oompa Loompa
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Widowmaker ue these heads sometimes. My heads are apparently a mix on pro toplines and somthing else. They get them cast especially. If that makes sense. Good NZ heads!

 

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Posted: Tue Oct 11, 2005 3:35 am 
Getting Side Ways
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EBXR8380 wrote:
I'd like to see someone build a strong motor with a set of these...
http://www.protopline.com/racingaluminumford.htm


I would like to see race and dyno results, they list heaps for Chevs but no Ford results?

 

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Posted: Tue Oct 11, 2005 9:10 am 
Oompa Loompa
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thanks EDXR8. i am not after a wild combo. just something that is streetable. thats why i thought of getting a nice set of heads, instead of a cam change. mick webb offered this advice to me, that a good starting point is actually the heads, where the combustion is developed, not the cam as everyone thinks. admittedly the right camsahft compliments a good set of heads.

i am ultimately aiming for about 250+kW at the end of it all - heads, cam upgrade, intake port match, chip to match. i already have the exhaust/K&N.

If what you're saying about the GT40p, they may be ample for my needs.
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Posted: Tue Oct 11, 2005 10:18 am 
Getting Side Ways
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have a look on the AFR website and see the power a pair of those give with even with a stock cam !

 

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Posted: Fri Oct 14, 2005 11:56 pm 
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EBXR8380 wrote:
I'd like to see someone build a strong motor with a set of these...
http://www.protopline.com/racingaluminumford.htm


Heres one....

Image

Cheers,
Pete.
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Posted: Sat Oct 15, 2005 1:45 am 
Getting Side Ways
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I take thats in a boat ???

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Mon Oct 17, 2005 11:25 am 
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ah yes.
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Posted: Mon Oct 17, 2005 12:08 pm 
Getting Side Ways
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Love the cover on the extractors.

 

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Posted: Tue Oct 18, 2005 5:29 pm 
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Timmeh wrote:
Love the cover on the extractors.


That cover as you put it is actually the water jacket.

Cheers,
Pete
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Posted: Tue Oct 18, 2005 5:34 pm 
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XR9UTE wrote:
Timmeh wrote:
Love the cover on the extractors.


That cover as you put it is actually the water jacket.

Cheers,
Pete


More info for us not so technical boat people :)

 

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Posted: Wed Oct 19, 2005 12:50 am 
Getting Side Ways
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Power: 482 rwkw

Location: Penrith
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Water cooled and made so water doesn't flow back into engine...If its set up that way...
Boat turbo's also have a water / coolant incased in turbine, making them look massive...Cannot have too much heat in engine compartment...[Fire issues]

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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