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GT40Ps on EL XR8 

 

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Posted: Sat Sep 30, 2006 6:06 pm 
Getting Side Ways
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I will. This is the first time I've gone to this extent modifying my car.
I'll try and get it dyno'd before and after I get this done.

 

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Posted: Sat Sep 30, 2006 6:38 pm 
Getting Side Ways
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not sure if your EL GT extractors will fit.
but ive got the paccies that were on my E7's, then i fitted GT40P's and they still fit, just needed 90degree boots as u said.
why not some paccies? they're around 570 on ebay. get em fitted while doin heads!
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Posted: Sat Sep 30, 2006 6:59 pm 
Getting Side Ways
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If the same extractors fit the E7s then I should be right then. I'll just need new leads and different spark plugs gapped bigger I think.
If I can wangle the missus to allow me to get Pacemakers I will otherwise I'll stick with the GT extractors.

I guess it wouldnt hurt to get some nice chrome rocker covers if I can find any with the breather.

 

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Posted: Thu Oct 05, 2006 1:08 am 
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Timmeh wrote:
If the same extractors fit the E7s then I should be right then. I'll just need new leads and different spark plugs gapped bigger I think.
If I can wangle the missus to allow me to get Pacemakers I will otherwise I'll stick with the GT extractors.

I guess it wouldnt hurt to get some nice chrome rocker covers if I can find any with the breather.
i am curious,how many cc are in the chambers,can you measure one,may increase comp.ratio?

 

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Posted: Thu Oct 05, 2006 7:03 pm 
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GT-40P heads had 60 cc chambers and CR of 9.20:1

 

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Posted: Thu Oct 12, 2006 1:49 pm 
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TickXR wrote:
While the heads are off i would factor in port matching your intake and exhaust manifolds to your heads as well for maximum benefit



Hell no. By all means port match the intake but DO NOT port match the exhaust manifold to a GT40P. Do not even enlarge the port at all. Those heads have a reversion problem in the lower right corner & the only way to minimise it is to have a step down (ie larger manifold size) where the manifolds meet.

http://www.diyporting.com/gtpex.html Pay close attention to the velocity map near the bottom of the page. Also note that the best overall result came from blending the inside of the port & enlarging the exit made it worse.

 

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 Post subject: did ur extractors fit ok.
Posted: Mon Oct 16, 2006 2:36 pm 
Tyre Shredder
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did ur extractors fit ok. i was told by mike at pacemaker that the ph4000 which i have on my old motor wont fit the gt40p's i will diffinantly find out this wkend when we bolt them to it.ill let u know how it goes

 

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Posted: Mon Oct 16, 2006 3:14 pm 
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I don't think Timmeh has put them on yet.

 

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 Post subject: ok thanks
Posted: Mon Oct 16, 2006 3:25 pm 
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ok thanks for that kilma.

 

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Ef xr8. Charged 9psi, tw 170 heads,track heat intakes,1.72 rockers, f303 cam, custom plazma man/ rapid cooler, 60lb injectors, tko600, sct eliminator, aeromotive fuel system.

393 xe ghia stage 5 als raceglides c4,9" full spool 31spline moser axles. Will be looking at running high 9s low 10's

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Posted: Mon Oct 16, 2006 6:54 pm 
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FBTs had the gt extractors aswell as gt40ps right?

 

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Posted: Mon Oct 16, 2006 7:24 pm 
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Im pretty sure they had the same as the EL GT.

GT40s, not Ps. The Ps seem to be the only one in the GT40 group that require the angled plug boots from what I have read.

 

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Posted: Mon Oct 16, 2006 9:24 pm 
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According to the FPV website, the 1998 FBT had GT40P's.
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Posted: Tue Oct 17, 2006 10:57 am 
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All will be answered when we get the allowance for the front yard. Then the heads can go on.

On another note Crow Cams have selected a cam for me the 621354 is $620, the springs are $105, retainers $132 and locks $19.
On the website its the high performance cam for manual trans. MMM

 

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Posted: Tue Oct 17, 2006 11:20 am 
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ELGT extractors will bolt up to 40P's with NO problems. You will require the 90deg boot leads though.

 

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Posted: Tue Oct 17, 2006 11:27 am 
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Excellent good to know. Now I dont have to buy a new exhaust system. Thanks Walkinshaw.

 

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