This is topic GT-40 P heads in forum Tech Talk at Northern California Ford Owners  .


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Posted by mtbaughs (Member # 4052) on :
 
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
 
Posted by BlackNGold (Member # 655) on :
 
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...
 
Posted by HaulinAssMaro (Member # 541) on :
 
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]

[ February 14, 2005, 03:46 AM: Message edited by: HaulinAssMaro ]
 
Posted by 1WICKEDmach (Member # 4060) on :
 
You should be fine. My lunati cam is the same lift as the F cam and i have no problems.
 
Posted by mtbaughs (Member # 4052) on :
 
Thanks guys [patriot]
 
Posted by Rickster (Member # 962) on :
 
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)


???
 
Posted by jaybquick (Member # 4286) on :
 
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.
 
Posted by ranger guy (Member # 4899) on :
 
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??
 
Posted by ranger guy (Member # 4899) on :
 
will the gt40p heads bolt on my motor? i have 1.7 rockers and a e-cam
 
Posted by HaulinAssMaro (Member # 541) on :
 
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..........
 
Posted by ranger guy (Member # 4899) on :
 
someone was sayin that the headbolt sizes were different? is that true.
 
Posted by ranger guy (Member # 4899) on :
 
and what kind of power gains do you get?
 
Posted by jaybquick (Member # 4286) on :
 
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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