GT-40P heads, stock cam & 1.7 rockers?

94GT40

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Mar 30, 2005

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Apr 2, 2005

#1

• Apr 2, 2005

• #1

I'm going with the Cobra intake, GT-40P heads, sticking with the stock cam and will be using the 1.7 aluminum roller rockers. A few questions:

1. Does anyone here have a similar combo? If so what rwhp and rwtq numbers are you putting down?

2. From what I've read I will need to use some valve covers with more clearance. Any suggestions for inexpensive valve covers?

3. Will I need to do anything special to the Cobra intake to clear these valve covers?

4. I shouldn't have any piston to valve clearance problems using the stock cam, should I?

5. I read that the 94-95 Cobra's that used the 1.7 rockers actually had a milder cam than the 94-95 GT's. Is that true? It kinda makes sense in that they were only rated at 240hp.

Thanks in advance for any help.

 

W

wytstang

Mustang Master

Mar 14, 2004

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Summerville,SC missing South Fl. weather :(

Apr 2, 2005

#2

• Apr 2, 2005

• #2

2. You may be able to reuse your stock VC if not most here buy the 93-older stock VC for added clearance.
3. No
4. Nope
5. It was slightly more aggresive.
Good luck.

 

B

black94gt50

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Mar 31, 2005

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#3

• Apr 2, 2005

• #3

all u have to do if u have ne clearance problems is double up the o ringed metal gasket that came stock with our motors that little extra clearance will fix it right up

 

25thmustang

Mustang Master

Sep 5, 2003

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Montgomery, NY

Apr 2, 2005

#4

• Apr 2, 2005

• #4

My dad has this similar combo on his 91. GT-40Ps which have been milled, 1.72 rockers, and a Cobra intake. With all the bolt ons, it made 282 rwhp/318 rwtq and has gone 12.11 @ 110 in the 1/4. The heads have now been milled more and some more race oriented parts have been added. Should see 300+ rwhp, and well into the 11s!

Also forgot to add, this is on a stock cam, and a stock bottem end as well!

 

94GT40

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#5

• Apr 2, 2005

• #5

25thmustang said:

My dad has this similar combo on his 91. GT-40Ps which have been milled, 1.72 rockers, and a Cobra intake. With all the bolt ons, it made 282 rwhp/318 rwtq and has gone 12.11 @ 110 in the 1/4. The heads have now been milled more and some more race oriented parts have been added. Should see 300+ rwhp, and well into the 11s!

Also forgot to add, this is on a stock cam, and a stock bottem end as well!

Click to expand...

Thanks very much for the confirmation. The more I ask people who actually use these heads the better I feel about them. A local cop who has a similar combo is at 285 rwhp.

How do the "Thumper" ported heads compare with the GT-40P heads? I almost ordered the GT-40P's from Tri-State, but I'm still considering other options.

A. Tri-State modified GT-40P's 1.94/1.54 for $470 shipped
B. Thumper E7 ported heads for $595 + shipping
C. Buyfordracing GT-40Y's for $749 + shipping

What's the best bang for the buck for a low budget daily driver?

 

DFG 5OH

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Aug 28, 2004

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Apr 2, 2005

#6

• Apr 2, 2005

• #6

haha, i've been wondering the same questions. I guess you read my thread.

 

T

TMC

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Apr 2, 2005

#7

• Apr 2, 2005

• #7

http://home.comcast.net/~nmrastocker/NMRA_Stocker.html

Take a look at that page...There is some info there on one of my cars that ran a very similiar combo. Dyno sheets, timeslips and other stuff...

 

94GT40

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#8

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TMC said:

http://home.comcast.net/~nmrastocker/NMRA_Stocker.html

Take a look at that page...There is some info there on one of my cars that ran a very similiar combo. Dyno sheets, timeslips and other stuff...

Click to expand...

Thanks man... That's just what I'm looking for 281rwhp with an almost identical combo.

 

SaltWaterFish

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Cedar Rapids, IA

Apr 2, 2005

#9

• Apr 2, 2005

• #9

You'll have to get new headers($$$) with the P's. Thumpers

 

T

Tayohs 95Gt

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Aug 26, 2004

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Findlay ohio 45840

Apr 2, 2005

#10

• Apr 2, 2005

• #10

i am thinking about doing the Gt40 P heads they come off explorers correct? and what years can i get them from? also whats the price for the P series headers for the cars and where can i get em? thanks

 

T

Tayohs 95Gt

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Findlay ohio 45840

Apr 2, 2005

#11

• Apr 2, 2005

• #11

and this is for a SN95

 

Hef5.0weisen

20+ Year Stangneter

Mar 5, 2004

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Apr 3, 2005

#12

• Apr 3, 2005

• #12

SaltWaterFish said:

You'll have to get new headers($$$) with the P's. Thumpers

Click to expand...

I've got no experience with these heads/headers, but I have read on these boards some conflicting information. I think it was GreenMustangGT, he said regular headers work fine, he just needed to modify a socket for the spark plugs. Maybe contact him for more info, good luck

 

94GT40

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Mar 30, 2005

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Apr 3, 2005

#13

• Apr 3, 2005

• #13

SaltWaterFish said:

You'll have to get new headers($$$) with the P's. Thumpers

Click to expand...

Well... Yeah, but I'm gonna get new headers anyway. The GT-40P specific headers are only about $50 more expensive than the regular. I was pricing the ceramic coated headers by the way.

Here's a link...

http://www.macperformance.com/store/category.cfm?SID=3&Category_ID=794

 

tmoss

Gettin Wired

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Jun 28, 2001

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Apr 4, 2005

#14

• Apr 4, 2005

• #14

The MAC header coating is junk and is only applied to the outside. Contact Jet-Hot and get the headers you need with an internal and external coating with a good warranty (which you won't need).

 

W

wytstang

Mustang Master

Mar 14, 2004

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Summerville,SC missing South Fl. weather :(

Apr 4, 2005

#15

• Apr 4, 2005

• #15

If you're getting new headers go long tubes. Both Mac and BBK lt fit just fine with the gt40p heads. Lt's will make more power through out the entire RPM range than shortys will.

 

95Vert

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Aug 19, 2004

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Apr 4, 2005

#16

• Apr 4, 2005

• #16

I feel qualified to be subscribed to this thread but can't answer any hp/tq # questions. Need to take it to the dyno. Why not get an aftermarket cam? I learned the hard way about the rockers, I need to get a set of 1.7s now.