351W heads vs gt40p heads?

mustangsoldier · December 10th, 2008, 08:57 PM

i currently have 351W (dooe cast) heads. im wondering if the power gain would be worth the time and money of switch to gt40p heads?

Mlx50man · December 10th, 2008, 09:01 PM

good question. im interested too.

2002BLGT · December 10th, 2008, 09:16 PM

Originally Posted by mustangsoldier

i currently have 351W (dooe cast) heads. im wondering if the power gain would be worth the time and money of switch to gt40p heads?

GT40p head flow at .500 lift 185 intake 126 exhaust

DOOE head flow at .500 lift 181 intake 114 exhaust

you would probably never feel the difference , both are supposed to be between 58-60cc combustion chambers too ......

mustangsoldier · December 10th, 2008, 09:23 PM

so definetly wouldn't be worth the money then. im saving up for some trickflow heads so i if theres not ill just keep waiting for the those.

ryans88gt · December 10th, 2008, 09:54 PM

E7s are about the same as 351w DO heads.

mustangsoldier · December 10th, 2008, 10:19 PM

lol ok so now i have a vote for each side...

viperlocc · December 10th, 2008, 10:25 PM

ive asked this before with no answer. I have a used early '80's 351w and some fresh windsor jr. heads with 1.7 roller rockers. is it worth swapping stock heads for these or should i just sell them?

mustangsoldier · December 10th, 2008, 10:44 PM

lol thanks for hijacking my thread viper... definetly worth swapping from stock. im just trying to find out if gt40p is better than my 351s

1slo5.0 · December 10th, 2008, 10:48 PM

Originally Posted by mustangsoldier

i currently have 351W (dooe cast) heads. im wondering if the power gain would be worth the time and money of switch to gt40p heads?

P heads are probably the best factory Windsor head. Much better than the 351W heads. P heads flow better and have a better chamber design.

mustangsoldier · December 10th, 2008, 10:51 PM

THANK YOU darrell, finally an answer! yea ive got a guy who has some for sale fully assembled ready to bolt for 450 so i think ill pick those up.

1slo5.0 · December 10th, 2008, 10:51 PM

Originally Posted by 2002BLGT

GT40p head flow at .500 lift 185 intake 126 exhaust

DOOE head flow at .500 lift 181 intake 114 exhaust

you would probably never feel the difference , both are supposed to be between 58-60cc combustion chambers too ......

Peak numbers don't mean anything if the rest of the spectrum doesn't follow suit. P heads considerably outflow the 351 heads across the entire chart.

GT40P: 61/52 128/90 169/123 195/135 196/139 1.84/1.46 valves
69 351: 52/48 103/77 149/100 174/113 183/118 1.84/1.54 valves

mustangsoldier · December 10th, 2008, 10:53 PM

hey also darrell i already have bbk shorties will i have any fitting issues w/ those?

1slo5.0 · December 10th, 2008, 10:53 PM

Originally Posted by viperlocc

ive asked this before with no answer. I have a used early '80's 351w and some fresh windsor jr. heads with 1.7 roller rockers. is it worth swapping stock heads for these or should i just sell them?

Definitely put the Windsor Jr.s on....unless you want to sell them and get something better. Stock heads suck.

1slo5.0 · December 10th, 2008, 10:54 PM

Originally Posted by mustangsoldier

hey also darrell i already have bbk shorties will i have any fitting issues w/ those?

You won't know until you try. Some people say yes and some say no. I can't remember what shorties I've seen work and which ones haven't.

93mustank · December 10th, 2008, 10:57 PM

bbk shorties will work

mustangsoldier · December 10th, 2008, 10:59 PM

cool, hey thanks a lot darrell

mustangsoldier · December 10th, 2008, 11:00 PM

and mustank

December 10th, 2008, 08:57 PM	#1
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	351W heads vs gt40p heads? i currently have 351W (dooe cast) heads. im wondering if the power gain would be worth the time and money of switch to gt40p heads? __________________ shut up before i punch you in the throat

December 10th, 2008, 09:23 PM	#4
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	so definetly wouldn't be worth the money then. im saving up for some trickflow heads so i if theres not ill just keep waiting for the those. __________________ shut up before i punch you in the throat

December 10th, 2008, 09:54 PM	#5
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	E7s are about the same as 351w DO heads. __________________ 88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

December 10th, 2008, 10:19 PM	#6
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	lol ok so now i have a vote for each side... __________________ shut up before i punch you in the throat

December 10th, 2008, 10:44 PM	#8
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	lol thanks for hijacking my thread viper... definetly worth swapping from stock. im just trying to find out if gt40p is better than my 351s __________________ shut up before i punch you in the throat

December 10th, 2008, 09:01 PM	#2
Mlx50man Enthusiast 90 Mustang lx Boss 347 Join Date: Aug 2007 Location: Lakeland, FL Posts: 505 iTrader: 0 reviews	good question. im interested too.

December 10th, 2008, 10:25 PM	#7
viperlocc Regular 1985 Mustang GT Join Date: Oct 2008 Location: Stevens Point Posts: 316 iTrader: 0 reviews	ive asked this before with no answer. I have a used early '80's 351w and some fresh windsor jr. heads with 1.7 roller rockers. is it worth swapping stock heads for these or should i just sell them?

December 10th, 2008, 10:51 PM	#10
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	THANK YOU darrell, finally an answer! yea ive got a guy who has some for sale fully assembled ready to bolt for 450 so i think ill pick those up. __________________ shut up before i punch you in the throat

December 10th, 2008, 10:53 PM	#12
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	hey also darrell i already have bbk shorties will i have any fitting issues w/ those? __________________ shut up before i punch you in the throat

December 10th, 2008, 10:57 PM	#15
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	bbk shorties will work __________________ PeteAndersonRacing.com

December 10th, 2008, 10:59 PM	#16
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	cool, hey thanks a lot darrell __________________ shut up before i punch you in the throat

December 10th, 2008, 11:00 PM	#17
mustangsoldier Hardcore Enthusiast 1993 Mustang we'll find out when i come home from iraq. Join Date: Jul 2008 Location: from Lawton, OK stationed @ Ft. Hood, TX Posts: 1,860 iTrader: 0 reviews	and mustank __________________ shut up before i punch you in the throat

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