ah ok.
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1989 Ford Crown Victoria
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Very Nice!!! Land Yacht, do those headers line up with the stock H-Pipe?2002 Mercury Grand Marquis GS 4.6L V8, 1988 Mercury Grand Marquis GS 5.0L V8, 1979 Lincoln Mark V 6.6L V8, 1977 Lincoln Continental 7.5L V8, 1999 Chevrolet Suburban LT 5.7L V8Comment
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The actual ports on an E6 head are similar to an E7 head, a lot of the change is in the combustion chamber. E6 heads shroud the valves, and have a larger combustion chamber which produces less compression. They can be made to flow the same as a ported E7, but you still get low compression and its a fair amount of work/money. Primary reason for using those over something else would be a situation where you need less compression, probably would be good for a turbo setup.
E6se head combustion chamber, notice how surrounded those valves are:
E7TE combustion chamber. These are ported and I think may have slightly larger than stock valves, but the shape is the same as stock:
This is a GT40 iron head, notice its similar to the E7 combustion chamber. Much of the improvement on this head is in the port design, but you can see where the chamber is a bit larger.
This is a GT40P head's combustion chamber, notice the plug sits closer to the valves to promote better combustion:
The reason for the special headers on a P head is entirely because of the plug angle. Normal headers won't give enough room to change the plugs, or they'll have the boots right against the header. The different plug angle results in a better combustion chamber shape, and the exhaust port has a much better design. Smaller valve gives good velocity, and the much improved design allows for more flow with less valve size, which is a huge plus for performance. The low lift flow figures are very favorable, so you get a nice wide power band with them. They also are good for a performance boost over the GT40 head because the chamber is smaller, producing more compression, around a half point if I'm not mistaken. I don't have specs handy, but I believe its slightly smaller than the E7 combustion chamber size as well, but only by a cc or so. The bump in compression + more flow = kickass.
These are P heads on something. Notice the plug sticking almost straight out compared to an E7 or stock head
There are also 2 different GT40 heads, the Cobra GT40 and the Explorer GT40. Its basically the same head, but Explorer heads have a larger combustion chamber than the Cobra or even stock E7 heads. Mill them .030ish and you get a Cobra head. Basically that bigger combustion chamber drops the compression a bit. Still its a performance gain over a stock E7, but if the chamber size was the same, keeping the same compression as the E7 head, there would be an even larger performance gain.
This is also way off topic tho, but since its the OTB forum, I can ramble.
**edit, added some pics to show what I'm talking about**86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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It's still technical, let it ride.1983 Grand Marquis 2Dr Sedan "Mercules"
Tremec TKO conversion, hydraulic clutch, HURST equipped!
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gadget, you mention the remote possibility of someone using the high-swirl E6 heads for a low-compression setup. What would be the pros/cons of that compared to the D8OE? I thought the D8 was more similar to the E7 except for those huge chambers and nasty smog bumps.2012 Mazda5 Touring | Finally working on the LTD again!
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I don't know honestly. The high swirl might be good for a bit on the bottom end, but the shrouding of the valves makes it struggle at higher rpm/flow rates. Probably would make a hell of a turbo truck motor head.Originally posted by 1987cp View Post86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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If my car had the D8OE from the factory, they are the smallest exhaust ports I've ever seen. IIRC, my pinkie was the only finger that would fit in there to touch the valve stem, the emissions hump was so huge. I imagine in boosted apps, you'd want large exhaust ports for quicker spool up and optimal boost pressure.Originally posted by 1987cp View PostComment
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Assuming your car was basically teh same as mine, which it should be, it originally had E5AE heads.
2001 Ford Crown Victoria P71 - "The Fire Engine"
1985 Lincoln Town Car Signature Series
But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. Romans 5:8Comment
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ported e6 heads would be good on a 351w in a panther.....need to unshroud the valves.......thumper reccomended them to me once for a mild 351w build over the e7's.....nate ended up getting world products heads tho
1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
2006 Lincoln Town Car Signature. Stock for now
1989 Ford F-250 4x4 much much more to come, sefi converted so far.
1986 Toyota pickup with LSC wheels and 225/60/16 tires.
2008 Hyundai Elantra future Revcon toad
1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)
please be patient, rebuilding an empire!
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There's a place called Aerohead in Indy that has a deal on some worked-over E6's.
http://www.aeroheadracing.com/id4.html
Hard to see the pic. How do they look to you?Comment
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heh, thats actually where I got that pic from. The pic is larger, but scaled down on the page.
I don't know that I'd pay 800 bucks for e6 heads tho.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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Originally posted by lincolnmania View Post
Very interesting! So maybe I should consider playing with my old E6 heads at some point in the future.2012 Mazda5 Touring | Finally working on the LTD again!
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