5.8 head job

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Feb 5, 2009 | 10:47 PM

#16

Beanscoot

Cargo Master

Joined: May 2007

Posts: 2,071

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From: British Columbia

The problem with the "P" heads is that the spark plug angle was changed, complicating header or manifold installation.

Feb 7, 2009 | 02:45 PM

#17

Beamed

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will windsor headers work with the gt40 heads and how much of a diffrence will these make

Feb 7, 2009 | 10:34 PM

#18

Sportruk

Senior User

Joined: Jan 2009

Posts: 318

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From: Brampton, On. Can.

The GT40's are what is used on the Gen I Lightning. Probably good for about 15 HP over the E7. Just a guess.

Feb 7, 2009 | 10:39 PM

#19

Beamed

Senior User

Joined: Jan 2009

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what about the exhust tube headers would they be the same and the stock 351s

Feb 8, 2009 | 01:15 AM

#20

Sportruk

Senior User

Joined: Jan 2009

Posts: 318

Likes: 3

From: Brampton, On. Can.

Yes, the Lightning tube headers are the same configuration as the stock castiron manifold on the 351. Same as any truck shorty header.
The GT40 head is identical to the E7 head, just better flow numbers.

Feb 8, 2009 | 12:28 PM

#21

Beamed

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Joined: Jan 2009

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what ford vehicles come with the gt40 heads ill go get me a set for 80$ today from the junkyard thanks

Feb 8, 2009 | 12:47 PM

#22

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

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From: Ottawa, Ontario

The Gen1 Lightning, '96-97 Explorer 5.0, and Mustang Cobra. Look for 3 vertical bars on the end of the head and the following casting numbers...

Feb 8, 2009 | 01:00 PM

#23

Beamed

Senior User

Joined: Jan 2009

Posts: 240

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is there anything i should look for to find a nice set off a motor, ill try to find the lowest millage motor. i wish there was a gen 1 lighting in the junk yard, it would be in my yard. heres a page with sb ford flow numbers Board Navigation
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Feb 8, 2009 | 03:44 PM

#24

Beamed

Senior User

Joined: Jan 2009

Posts: 240

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thanks and conanski what about usin the gt intake manifold is there any power gains using that setup and would it work on my truck

Feb 8, 2009 | 03:46 PM

#25

Beamed

Senior User

Joined: Jan 2009

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also what about the 85 - 86 heads would they give me any more power gains than the gt40s, would they work on my truck and is changing the heads even worth doing

Feb 8, 2009 | 05:18 PM

#26

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

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From: Ottawa, Ontario

The GT intake may flow a little better than the stock 5.8 truck intake but you'll need a 5.8 GT lower to use it, the 5.0 lower is too narrow. The 5.8 certainly will benefit from better heads, and the GT40's are better than anything that came before.. in stock unported condition.

Mar 29, 2009 | 03:16 AM

#27

laynejc

Freshman User

Joined: Mar 2009

Posts: 35

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Quote:

Originally Posted by Conanski

the GT40's are better than anything that came before.. in stock unported condition.

so what is better in ported condition?

Mar 29, 2009 | 11:05 AM

#28

Conanski

FTE Legend

Joined: Jun 2006

Posts: 31,930

Likes: 1,499

From: Ottawa, Ontario

Quote:

Originally Posted by laynejc

so what is better in ported condition?

That's impossible to say because it depends how competent the porter is and exactly what is done to the heads. The old C9 casting has a lot of potential but it doesn't make much sense to spend $1500+ to have somebody professionally port them when you can buy brand new heads that will outflow them for less.