351W heads vs gt40p heads? - Forums at Modded Mustangs
 
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post #1 of 17 Old December 10th, 2008, 08:57 PM Thread Starter
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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?

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post #2 of 17 Old December 10th, 2008, 09:01 PM
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good question. im interested too.
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post #3 of 17 Old December 10th, 2008, 09:16 PM
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Quote:
Originally Posted by mustangsoldier View Post
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 ......
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post #4 of 17 Old December 10th, 2008, 09:23 PM Thread Starter
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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.

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post #5 of 17 Old December 10th, 2008, 09:54 PM
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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

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post #6 of 17 Old December 10th, 2008, 10:19 PM Thread Starter
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lol ok so now i have a vote for each side...

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post #7 of 17 Old December 10th, 2008, 10:25 PM
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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?
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post #8 of 17 Old December 10th, 2008, 10:44 PM Thread Starter
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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

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post #9 of 17 Old December 10th, 2008, 10:48 PM
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Originally Posted by mustangsoldier View Post
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.

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #10 of 17 Old December 10th, 2008, 10:51 PM Thread Starter
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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.

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post #11 of 17 Old December 10th, 2008, 10:51 PM
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Quote:
Originally Posted by 2002BLGT View Post
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

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #12 of 17 Old December 10th, 2008, 10:53 PM Thread Starter
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hey also darrell i already have bbk shorties will i have any fitting issues w/ those?

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post #13 of 17 Old December 10th, 2008, 10:53 PM
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Quote:
Originally Posted by viperlocc View Post
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.

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #14 of 17 Old December 10th, 2008, 10:54 PM
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Originally Posted by mustangsoldier View Post
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.

My daily driver has 16 cylinders and 4400hp @ 1000 rpm....


***1988 Mustang GT - Stock....almost
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post #15 of 17 Old December 10th, 2008, 10:57 PM
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bbk shorties will work

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post #16 of 17 Old December 10th, 2008, 10:59 PM Thread Starter
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cool, hey thanks a lot darrell

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post #17 of 17 Old December 10th, 2008, 11:00 PM Thread Starter
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and mustank

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