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Author
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Topic: GT-40 P heads
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mtbaughs
Road Racer
Member # 4052
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posted
 
 
How good are the valve springs on these heads? Can they except 1.6 rockers and an e-cam or do they need to be upgraded to better springs. Thanks
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
I never had any experience with those heads Mike, but I can tell you one thing....I've learned the hard way too many times to match all the components of the valvetrain...
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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HaulinAss Motorsports
Its a STREETRaceCar!
Member # 541
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posted
You will be fine with a 1.6 rocker and an E Cam.I have the P heads with an E cam and 1.7 rockers and am having no issues at all with valve float or coil bind.Hope that helps ![[patriot]](graemlins/patriot.gif)
[ February 14, 2005, 03:46 AM: Message edited by: HaulinAssMaro ]
Posts: 22494 | From: Sacramento | Registered: Nov 2001
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1WICKEDmach
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Member # 4060
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posted
You should be fine. My lunati cam is the same lift as the F cam and i have no problems.
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RACETUNE
2003 Torch Red Mach 1
Maximum Motorsports Suspension, Exhaust, 4:10's
12.9@105mph 1.88 60ft
Posts: 302 | Registered: Jan 2004
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mtbaughs
Road Racer
Member # 4052
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posted
Thanks guys
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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Rickster
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Member # 962
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posted
Hijack....so I would assume then that the springs that came stock with the GT40P's would be fine with the TFS stage1? .512 lift? I calced the e303 with 1.7's to be around .528 lift...(.498 @.5 w/ 1.6 R)
???
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1965 ACCobra Replica (FFR MKll)
w/ 1992 LX convert. running gear
Planning ahead for that midlife crissis!
Posts: 131 | From: Cedar Ridge | Registered: Mar 2002
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jaybquick
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Member # 4286
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posted
On my buddies GT40-Ps it was too close to binding with the trick flow stage 1 cam and 1.6 rockers. I wouldn't risk droppin a valve over a $100 would you. Check it like you always should, that is what I do.
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91 Mustang GT ET: 11.92@115
66 Mustang ET: 11.43@119
01 Audi S4 ET: 10.8@131
05 Audi S4 ET: 11.9@116
08 Audi S5 ET: 11.9@118
Posts: 416 | From: Lathrop | Registered: Mar 2004
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badazlx
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Member # 4899
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posted
i was wondering if the gt40 p heads of a older lightning would bolt on my 89 gt with 1.7 rockers and a e-cam. and what kind of power gains would i expect on 8 punds of boost??
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03 mach bolt ons/125 shot
Posts: 911 | From: roseville | Registered: Sep 2004
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badazlx
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Member # 4899
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posted
will the gt40p heads bolt on my motor? i have 1.7 rockers and a e-cam
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03 mach bolt ons/125 shot
Posts: 911 | From: roseville | Registered: Sep 2004
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HaulinAss Motorsports
Its a STREETRaceCar!
Member # 541
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posted
quote:
Originally posted by ranger guy:
will the gt40p heads bolt on my motor? i have 1.7 rockers and a e-cam
did you read my reply above? that is exactly what I have as far as H/C and ROockers are concerned..........
Posts: 22494 | From: Sacramento | Registered: Nov 2001
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badazlx
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Member # 4899
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posted
someone was sayin that the headbolt sizes were different? is that true.
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03 mach bolt ons/125 shot
Posts: 911 | From: roseville | Registered: Sep 2004
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badazlx
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Member # 4899
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posted
and what kind of power gains do you get?
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03 mach bolt ons/125 shot
Posts: 911 | From: roseville | Registered: Sep 2004
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jaybquick
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Member # 4286
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posted
quote:
Originally posted by ranger guy:
someone was sayin that the headbolt sizes were different? is that true.
head bolt sizes are the same. Just put some on my buddies car this weekend. They raise compression, move the park plug closer to the center of the chamber. They also flow better than the original gt40s. I am guessing maybe 20hp untouched.
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91 Mustang GT ET: 11.92@115
66 Mustang ET: 11.43@119
01 Audi S4 ET: 10.8@131
05 Audi S4 ET: 11.9@116
08 Audi S5 ET: 11.9@118
Posts: 416 | From: Lathrop | Registered: Mar 2004
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