E7TE vs. GT40 Heads comparison....
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Posting Guru
Joined: Jun 2002
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Anything you do to the engine to make it breathe easier is definitely going to free up some power no doubt... If roller rockers weren't so good how come everybody is using them in big horsepower motors, they are definitely a good benefit along with some good heads and any other mod that helps out the motor. It seems that you are always trying to shoot down any positive vibes about roller rockers Racin, why is that?
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Joined: Dec 2004
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From: Maple Valley, WA
What??? I just got done saying roller rockers are a benefit to performance. I have never tried to shoot down "positive vibes" about RR. My issue is with the ratio. Too many people are insistant on using a 1.7 ratio RR because they think its an easy way to gain a bunch of power, and thats just not true, its like the equivlent of using JB weld on something that should be welded, its just a patch. 1.6:1 ratio roller rockers are plenty fine for any application, if you wanna use 1.7's, fine go for it, but dont expect gains from the ratio. If you want decent gains, change your cam.
Hotshot
Joined: May 2003
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From: south louisiana
Originally Posted by RacinNdrummin
Yes, but the F4TE is also a roller cam which frees up more power than your .030-.040 lift did. The 94-95 5.0's were rated at 205 (195 for the auto) which are revised estimates from ford. I think the change in power numbers came directly from the change in the way the power was measured. The 351 in 94 didnt change 1 bit from 93, and it was rated at 10 HP/25 ft.lbs more than in 93. same with the 460 as far as an increase in power, yet with no change in the engine. I would find it hard to believe that the F4TE cam change was worth 25hp/5ft.lbs more than the flat tappet truck cam. I bet if you took identical truck engines, side by side, one with an F4 and one with the flat tappet, you might see a 10hp difference tops on the dyno, and most of that would be duration and the fact that it has a roller cam. .030-.040 more lift on stock ford E7's will not make a difference.
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Joined: Jun 2005
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here is some good info on both heads, look at the left menu for gt40 and E7 head
http://www.cmc.net/~xero/Mousesporting.html
http://www.cmc.net/~xero/Mousesporting.html
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