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Old 01-26-2004, 08:20   #1 (permalink)
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Are the heads and manifold on an EL XR8 restrictive?

Just wondering what heads and manifold the EL XR8's have and how restrictive they are. Cheers.
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Old 01-26-2004, 15:17   #2 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

It depends which series. Series 1 are like EB-D 5ltrs, they have the restrictive HO intake and E7 heads. Series 2 had the explorer manifold (much better) but still retained the E7 heads.

If you can get your hands on a EL2 Xr8 explorer manifold, you'll be laughing! Then you could either port the crap outta the E7's or spend 1k on a set of GT40P's from Herrods. The GT40P's are much better flowing in standard form than the E7's will ever be in ported form. IMO, you should go the GT40P's as the cost for porting the E7's will probably come out not much cheaper.

I have also heard that the 40P's can be further ported for bigger potential.

Just my 2c
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Old 01-26-2004, 15:28   #3 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

You could get the 40Ps from an engine importer as well. I see them in the parts peddler here in NSW from time to time. But if your handy and can follow instructions, you could port the E7s yourself. Thats what I'm going to do within the next 6 months or so with before and after figures on the dyno. But if you are not confident about doing the port work yourself, then the 40Ps will be a better proposition.
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Old 01-26-2004, 15:43   #4 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

Check these sites out DIY porting for E7's.

http://www.mustangcentral.net/tech/e7.html

http://www.geocities.com/jjonibones/E7p2.html
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Old 01-26-2004, 19:04   #5 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

I dont know about the EFI manifolds, but the heads are the most restrictive part of a windsor engine...
If you want power, you need heads. I would bypass all the factory offerings and go aftermarket.
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Old 01-26-2004, 20:26   #6 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

The intake is more restrictive than the heads, but it is close. Also fully ported E7's flow about as much as the stock GT40P's, that's why I went for the GT40P's in the first place. The GT40P's can also be further ported, I am doing mine this week. As for intakes, anything from ford with the GT40 base (Explorer, cobra or GT40) would be a good upgrade or just go for aftermarket edelbrock or trickflow ones.
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Old 01-26-2004, 20:42   #7 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

look here:
http://www.jason.fletcher.net/tech/c...nd2v/page1.jpg
From what I remember, the US 2v heads were the second choice, with preferred being the australian castings...
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Old 01-26-2004, 22:01   #8 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

HEAVILY ported stock heads fitted with larger valves are lucky to flow 200-210cfm.

Its just not worth spending $1.5k to have the work done, when the worst flowing aftermarket heads available will out flow them......

Just my 2c
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Old 01-26-2004, 23:14   #9 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

Quote:
Originally Posted by blueoval
It depends which series. Series 1 are like EB-D 5ltrs, they have the restrictive HO intake and E7 heads. Series 2 had the explorer manifold (much better) but still retained the E7 heads.

If you can get your hands on a EL2 Xr8 explorer manifold, you'll be laughing! Then you could either port the crap outta the E7's or spend 1k on a set of GT40P's from Herrods. The GT40P's are much better flowing in standard form than the E7's will ever be in ported form. IMO, you should go the GT40P's as the cost for porting the E7's will probably come out not much cheaper.

I have also heard that the 40P's can be further ported for bigger potential.

Just my 2c
You can't really get a better answer than that!

If you let us know some more details about why your asking (i.e. Have an EL1XR8 and want more go, or want to know which EL to buy etc etc), we can give you some more specific advice . . .
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Old 01-27-2004, 00:04   #10 (permalink)
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Re: Are the heads and manifold on an EL XR8 restrictive?

Can someone explain the pyhsical differnces (ie what i'd be looking for, cast numbers, etc ) with the manifolds plz.. Ignoring production dates of the car how could i tell one from the other
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