Ports on the stock heads don't require anything larger than a 1 1/2" primary. The stock HO headers are fine if the head is not ported, and really if you're planning a future upgrade, just use the manifolds for now. It won't sound horrible, not much different than it does now. The tone will be a bit different but it won't suddenly go from sounding good to sounding like hammered shit.
 |
-
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 rousers -
+1Originally posted by gadget73 View Post
Isn't that also theoretically true for most street heads that will operate at 2000rpm or less?2012 Mazda5 Touring | Finally working on the LTD again!
Comment
-
Great info, thanks.1987 LTD CROWN VICTORIA, 5.0 EFI, MAGNAFLOW DUAL EXH, RED LANDAU
FRESH AOD, 3.27 OPEN DIFF, 57K MILES, B&M SHIFT KIT AND R134A A/C
Comment
-
I am running stock manifolds on mine, stock h-pipe and duals. It sounds like a Mustang with the HO conversion, with a touch of a lope thanks to whatever the hell cam is in there now (came out of an HO but obviously isn't stock).
Manifolds won't make it sound like shit, and the car pulls like a raped ape, so I definitely picked up a boat load of power. Car is going to the track this weekend.
It ran 18-flat stock, I'll let you know what it runs now when I get back.1989 Town Car Cartier: 3G Alt. Upgrade, Mark VIII Electric Fan, Police Interceptor Suspension, 40-series Flows, loaded. HO+ Conversion: E7 heads, Cobra 1.7RR's, Explorer intake, 65mm TB, FMS "E" Camshaft, 4-hole 19lb/hr injectors, A9P ECM, 76mm C&L MAF, BBK CAI. 338,000Km, stock bottom-end.
Comment
-
Probably, but I suspect its more to do with the port size than operating RPM. The holes in the side of a stock E7 are not that big. The tubes on a 1 5/8" header are a fair bit bigger than the ports. Ideally you want the exhaust gaskets and primary tubes to be just ever so slightly larger than the ports in the head so they don't introduce turbulence from changing sizes. It also keeps exhaust velocity up. Usually higher RPM engines will have larger ports just for the increased airflow, so headers should be sized accordingly.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
-
Huh, I hadn't thought about issues with turbulence. Maybe I should consider exchanging my oval-port Flowtech shorties (PN 12106) for a rectangular-port design, since the GT40 ports are about the same size as an E7's.Last edited by 1987cp; 04-17-2007, 07:19 AM.2012 Mazda5 Touring | Finally working on the LTD again!
Comment
-
The amount of power difference from any turbulence between a square and oval port header are probably pretty insignificant really, maybe 1-2 hp at most. You'd never really notice it.
Some interesting food for thought:
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
-
So in the end your car is gonna have the full HO conversion, shorty headers with a 2.5" exhaust with an O/R h-pipe? That sounds like a good plan, and I think BBK shorties are gonna be what you're looking for.88 Town Car (wrecked, for sale)
Walker OEM duals with muffler deletesComment
-
nobody remembers the 1990 towncar headers?
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!
Comment
-
-
I've definitely heard of 'em, but don't really know much about them. Don't think I've even seen a picture of them, but I'd like to see one.Originally posted by lincolnmania View Post2012 Mazda5 Touring | Finally working on the LTD again!
Comment
-
I think Pete has them on his '85. Or had them at one point.Originally posted by 1987cp View Post
EDIT: not really sure now. Don't see any pics of them. I thought for sure he had them.Last edited by Tiggie; 04-18-2007, 04:55 PM.1990 Country Squire - under restoration
1988 Crown Vic LTD Wagon - daily beater
GMN Box Panther History
Box Panther Horsepower and Torque Ratings
Box Panther Production NumbersComment
-
pete has pics somewhere
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!
Comment
-
Comment