358w/GT40 Heads/302 Intake Question

teal89 · May 11th, 2008, 12:31 AM

As you saw in the title, I will be getting a 358ci/351w and a pair of GT-40 heads(Not P's or X's) just GT40.

My question for those who have done this or tested(Experienced not"What I've seen or heard") is will the GT40 heads bolt up to the 351w.

Next is IF the gt40 heads bolt up, will my 302 lower intake bolt up to the gt40 heads which will be on the 351w?

Currently this motor has got Speed Pro Hyper Pistons .30 over on the block and the rest of the rotories.

Thanks guys

95opal · May 11th, 2008, 12:39 AM

1. Those heads will choke that motor.

2. No your lower intake will not work.

JBIGBOOTSY · May 11th, 2008, 12:43 AM

The head bolt holes will have to be drilled to 1/2", the taller deck height spreads the heads higher and further apart, so the 302 intake is not wide enough.

86gtconvert · May 13th, 2008, 11:55 PM

those heads work fine on a 351w with mild mods,and breath good..drill them to 1/2 inch and get a wider 351w intake... if you plan on a good build on a windsor i woul
d ditch the gt40s unless ya port them and get aftermarket.. get 351 true windsor heads like the d0e heads can make great power and breath good..just my 2 cents

nba1341 · May 14th, 2008, 01:05 AM

please sell me the heads

Goblin · May 14th, 2008, 03:19 AM

Originally Posted by 86gtconvert

those heads work fine on a 351w with mild mods,and breath good..drill them to 1/2 inch and get a wider 351w intake... if you plan on a good build on a windsor i woul
d ditch the gt40s unless ya port them and get aftermarket.. get 351 true windsor heads like the d0e heads can make great power and breath good..just my 2 cents

Keep your 2 cents, looks like you need it more than he does.

JBIGBOOTSY · May 14th, 2008, 05:55 AM

Originally Posted by 86gtconvert

those heads work fine on a 351w with mild mods,and breath good..drill them to 1/2 inch and get a wider 351w intake... if you plan on a good build on a windsor i woul
d ditch the gt40s unless ya port them and get aftermarket.. get 351 true windsor heads like the d0e heads can make great power and breath good..just my 2 cents

I believe the gt40p out flows the d heads.

Iownastang · May 14th, 2008, 08:47 AM

Originally Posted by JBIGBOOTSY

I believe the gt40p out flows the d heads.

I always thought they did.

89lx · May 14th, 2008, 12:00 PM

just reading the thread and was wondering if you can put 351 heads on a 302 and if its worth it

86gtconvert · May 14th, 2008, 12:07 PM

only if there true 351w heads and not after about 69-71 or so or they are no diffrent then 302 ...gtp heads are better then gt40 but he said regular gt40 heads not p..go to fletchs 5.0 carbureted website there they have a good chart of everykinda head flow ya can think of.. see what regular gt40 and p, early 351w heads all flow.. drill out 302 heads to 1/2 inch hole and they will bolt on fine,to bolt on windsor heads to a 302 ya need step down washers to go from a 351w hole to a 302

86gtconvert · May 14th, 2008, 12:12 PM

by the way yall are harsh,im just trying to help out,reguardless of what yall say,CANT WE AQLL GET ALONG!! it"ll drive a man to drinking...ok let the remarks begin and get it over with. i build my own stuff and race it too( 4 fun) just trying 2help out..

95opal · May 14th, 2008, 01:34 PM

Originally Posted by 86gtconvert

i build my own stuff and race it too( 4 fun) just trying 2help out..

Then you should know that building a 358 with gt40 irons is not really a good thing.

JBIGBOOTSY · May 14th, 2008, 04:54 PM

Originally Posted by 86gtconvert

only if there true 351w heads and not after about 69-71 or so or they are no diffrent then 302 ...gtp heads are better then gt40 but he said regular gt40 heads not p..go to fletchs 5.0 carbureted website there they have a good chart of everykinda head flow ya can think of.. see what regular gt40 and p, early 351w heads all flow.. drill out 302 heads to 1/2 inch hole and they will bolt on fine,to bolt on windsor heads to a 302 ya need step down washers to go from a 351w hole to a 302

That site lists the gt40 (195cfm), gt40p(196cfm) and 351 D0 (181cfm) all are stock, and all at .500 lift.

ryans88gt · May 14th, 2008, 05:00 PM

So anyway, can anyone say lightning motor.

that is a 351w with GT40 heads and GT40 tubular intake. It made a whopping 245 hp. If you want to make sick power like that, put the GT40 heads on the 351 and use a stockish intake *sarcasm*

83fox · May 14th, 2008, 07:29 PM

a bolt on lightning motor with an sts turbo system puts up some pretty good numbers

Goblin · May 14th, 2008, 07:51 PM

*Shakes head* Ryan, you are a funny muthafu*ker, you know that?

86gtconvert >

We understand your trying to help, thank you for your kindness. All I ask, aswell as the rest of us, is that you do so with "accurate and correct" informantion. Thats all. Thank you. Have a nice day.

nba1341 · May 15th, 2008, 03:46 AM

sell me the damn gt40 heads!

beheivjer · May 15th, 2008, 08:52 AM

you can buy them on ebay for 300 usually

beheivjer · May 15th, 2008, 08:54 AM

h ttp://cgi.ebay.com/ebaymotors/Gt40P-Cylinder-heads-GT40-mustang-cobra-302-ford-gt-40_W0QQitemZ290230263828QQihZ019QQcategoryZ33617QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem

here is a set right there

May 11th, 2008, 12:31 AM	#1
teal89 Enthusiast 89 Mustang Lx Join Date: Feb 2008 Location: Rockwall, Texas Posts: 527 iTrader: 0 reviews	358w/GT40 Heads/302 Intake Question As you saw in the title, I will be getting a 358ci/351w and a pair of GT-40 heads(Not P's or X's) just GT40. My question for those who have done this or tested(Experienced not"What I've seen or heard") is will the GT40 heads bolt up to the 351w. Next is IF the gt40 heads bolt up, will my 302 lower intake bolt up to the gt40 heads which will be on the 351w? Currently this motor has got Speed Pro Hyper Pistons .30 over on the block and the rest of the rotories. Thanks guys __________________ 94-95 306, B-Cam, Off-brand BBK Like Headers, H-Pipe, 3.73's, Nitrous Wet Shot 175 Shot

May 11th, 2008, 12:39 AM	#2
95opal Hardcore Enthusiast 95 opalfrost gt Join Date: Nov 2006 Location: Connecticut Posts: 1,516 iTrader: 0 reviews	1. Those heads will choke that motor. 2. No your lower intake will not work. __________________ 5.0 magazines 94-04 performance mustangs feature car! Fall 2010

May 13th, 2008, 11:55 PM	#4
86gtconvert Regular 1986 mustang gt convert Join Date: Apr 2008 Location: wyoming Posts: 72 iTrader: 0 reviews	those heads work fine on a 351w with mild mods,and breath good..drill them to 1/2 inch and get a wider 351w intake... if you plan on a good build on a windsor i woul d ditch the gt40s unless ya port them and get aftermarket.. get 351 true windsor heads like the d0e heads can make great power and breath good..just my 2 cents Last edited by 86gtconvert; May 13th, 2008 at 11:56 PM. Reason: typo

May 14th, 2008, 01:05 AM	#5
nba1341 Banned 1965 Mustang Fastback Join Date: Apr 2007 Location: Los Angeles, Cal Posts: 24,982 Posts: 2,194 iTrader: 0 reviews	please sell me the heads __________________ I'm a good boy now. [COLOR=red][B]slow car club - crew member 7 of 9 [COLOR=White]Mood: Cool :cool: [/COLOR][/B] [/COLOR]

May 14th, 2008, 05:00 PM	#14
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 4,737 iTrader: 0 reviews	So anyway, can anyone say lightning motor. that is a 351w with GT40 heads and GT40 tubular intake. It made a whopping 245 hp. If you want to make sick power like that, put the GT40 heads on the 351 and use a stockish intake sarcasm __________________ 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

May 11th, 2008, 12:43 AM	#3
JBIGBOOTSY MM Fanatic 1990 LX hatch Join Date: Aug 2006 Location: Hobart Indiana Posts: 4,391 iTrader: 0 reviews	The head bolt holes will have to be drilled to 1/2", the taller deck height spreads the heads higher and further apart, so the 302 intake is not wide enough.

May 14th, 2008, 12:00 PM	#9
89lx Regular 1989 LX coupe 5.0L Join Date: Dec 2007 Location: NS Canada Posts: 496 iTrader: 0 reviews	just reading the thread and was wondering if you can put 351 heads on a 302 and if its worth it

May 14th, 2008, 12:07 PM	#10
86gtconvert Regular 1986 mustang gt convert Join Date: Apr 2008 Location: wyoming Posts: 72 iTrader: 0 reviews	only if there true 351w heads and not after about 69-71 or so or they are no diffrent then 302 ...gtp heads are better then gt40 but he said regular gt40 heads not p..go to fletchs 5.0 carbureted website there they have a good chart of everykinda head flow ya can think of.. see what regular gt40 and p, early 351w heads all flow.. drill out 302 heads to 1/2 inch hole and they will bolt on fine,to bolt on windsor heads to a 302 ya need step down washers to go from a 351w hole to a 302

May 14th, 2008, 12:12 PM	#11
86gtconvert Regular 1986 mustang gt convert Join Date: Apr 2008 Location: wyoming Posts: 72 iTrader: 0 reviews	by the way yall are harsh,im just trying to help out,reguardless of what yall say,CANT WE AQLL GET ALONG!! it"ll drive a man to drinking...ok let the remarks begin and get it over with. i build my own stuff and race it too( 4 fun) just trying 2help out..

May 14th, 2008, 07:29 PM	#15
83fox Enthusiast 1983 mustang lx Join Date: Apr 2008 Posts: 504 iTrader: 0 reviews	a bolt on lightning motor with an sts turbo system puts up some pretty good numbers

May 14th, 2008, 07:51 PM	#16
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Shakes head Ryan, you are a funny muthafu*ker, you know that? 86gtconvert > We understand your trying to help, thank you for your kindness. All I ask, aswell as the rest of us, is that you do so with "accurate and correct" informantion. Thats all. Thank you. Have a nice day. __________________

May 15th, 2008, 03:46 AM	#17
nba1341 Banned 1965 Mustang Fastback Join Date: Apr 2007 Location: Los Angeles, Cal Posts: 24,982 Posts: 2,194 iTrader: 0 reviews	sell me the damn gt40 heads! __________________ I'm a good boy now. [COLOR=red][B]slow car club - crew member 7 of 9 [COLOR=White]Mood: Cool :cool: [/COLOR][/B] [/COLOR]

May 15th, 2008, 08:52 AM	#18
beheivjer Enthusiast Join Date: Feb 2006 Location: belding, michigan Posts: 840 iTrader: 0 reviews	you can buy them on ebay for 300 usually __________________ 1969 Early Bronco 3.5" lift 37" swampers 1969 Early Bronco 2" lift half cab 1979 2.3t Cobra 1997 Black Cobra http://www.cardomain.com/ride/680999 http://www.myspace.com/beheivjer

May 15th, 2008, 08:54 AM	#19
beheivjer Enthusiast Join Date: Feb 2006 Location: belding, michigan Posts: 840 iTrader: 0 reviews	h ttp://cgi.ebay.com/ebaymotors/Gt40P-Cylinder-heads-GT40-mustang-cobra-302-ford-gt-40_W0QQitemZ290230263828QQihZ019QQcategoryZ33617QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem here is a set right there __________________ 1969 Early Bronco 3.5" lift 37" swampers 1969 Early Bronco 2" lift half cab 1979 2.3t Cobra 1997 Black Cobra http://www.cardomain.com/ride/680999 http://www.myspace.com/beheivjer

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