351 w Heads

92mustanglx · January 22nd, 2007, 09:53 PM

Has anyone on this forum ever used a set of 351 w on a fuel injected 302? I might be picking up a set for a good price just wondering if its a good performance choice? Anything i should look out for?

Thanks
Joe

woody1 · January 23rd, 2007, 12:01 AM

equivalent to a gt40 head

FastBack71 · January 23rd, 2007, 09:29 PM

so you can literally just swap the 351w heads onto a 302?? what is involved in the prcoess??

mikebert · January 23rd, 2007, 10:11 PM

I think 351W has 1/2" head bolts, 302 has 7/16. Other than that, it's a straight bolt on (no pun intended).

FastBack71 · January 24th, 2007, 07:18 AM

wow and how does it affect the performance?

C MY 4D · January 24th, 2007, 07:28 AM

Originally Posted by FastBack71

wow and how does it affect the performance?

compared to an E7 head..... a ton

FastBack71 · January 24th, 2007, 11:22 AM

like what 15 hp??? im excited to do this!!!

1slo5.0 · January 24th, 2007, 01:24 PM

Stock for stock 69 and 70 351W heads flow about 30 more cfm on the intake than an E7. Exhaust flow is about the same. 69 and 70 351W heads use 1.84/1.54 valves and most of the other 351W heads run 1.78/1.46 valves and have larger chambers. Anything other than the 69 and 70 heads is pretty much a wash and not worth the time.

StangAddiction · January 24th, 2007, 04:17 PM

Originally Posted by mikebert

I think 351W has 1/2" head bolts, 302 has 7/16. Other than that, it's a straight bolt on (no pun intended).

302 heads will fit a 351w providing that the bolt holes are bored out for the larger bolts. But once they're bored out, they're 351 heads and cant go back to a 302 considering the bolts wont fit and theres not really any way to make em fit...=/

C MY 4D · January 24th, 2007, 06:20 PM

Originally Posted by StangAddiction

Originally Posted by mikebert

I think 351W has 1/2" head bolts, 302 has 7/16. Other than that, it's a straight bolt on (no pun intended).

302 heads will fit a 351w providing that the bolt holes are bored out for the larger bolts. But once they're bored out, they're 351 heads and cant go back to a 302 considering the bolts wont fit and theres not really any way to make em fit...=/

This is when you use a sleeved bolt....

Most aftermarket heads come drilled 1/2"

1slo5.0 · January 24th, 2007, 08:34 PM

Originally Posted by C MY 4D

This is when you use a sleeved bolt.... Most aftermarket heads come drilled 1/2"

+1

You can use head bushings too.

StangAddiction · January 24th, 2007, 09:21 PM

Originally Posted by C MY 4D

Originally Posted by StangAddiction

Originally Posted by mikebert

I think 351W has 1/2" head bolts, 302 has 7/16. Other than that, it's a straight bolt on (no pun intended).

302 heads will fit a 351w providing that the bolt holes are bored out for the larger bolts. But once they're bored out, they're 351 heads and cant go back to a 302 considering the bolts wont fit and theres not really any way to make em fit...=/

This is when you use a sleeved bolt.... Most aftermarket heads come drilled 1/2"

forseriously? =P

January 22nd, 2007, 09:53 PM	#1
92mustanglx Newbie Join Date: Apr 2006 Location: Ottawa, Ontario, Canada Posts: 48 iTrader: 0 reviews	351 w Heads Has anyone on this forum ever used a set of 351 w on a fuel injected 302? I might be picking up a set for a good price just wondering if its a good performance choice? Anything i should look out for? Thanks Joe __________________ 302, EdelBrock Upper and Lower Intake, GT40 Aluminum Heads, E303, Shaved&Balanced Crank w/bearings, BBK Induction, SuperChip, BBK Shortys, BBK Off Road HPipe, Flow Masters, 4:10, 2" Eibach Drop Springs, 17x9 Chrome Cobra R, 245/45ZR17

January 23rd, 2007, 09:29 PM	#3
FastBack71 Enthusiast Join Date: Dec 2006 Posts: 587 iTrader: 0 reviews	so you can literally just swap the 351w heads onto a 302?? what is involved in the prcoess?? __________________ My friends used to wonder Why i joined the air force. Now they wonder why they didn't.

January 24th, 2007, 07:18 AM	#5
FastBack71 Enthusiast Join Date: Dec 2006 Posts: 587 iTrader: 0 reviews	wow and how does it affect the performance? __________________ My friends used to wonder Why i joined the air force. Now they wonder why they didn't.

January 24th, 2007, 01:24 PM	#8
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Stock for stock 69 and 70 351W heads flow about 30 more cfm on the intake than an E7. Exhaust flow is about the same. 69 and 70 351W heads use 1.84/1.54 valves and most of the other 351W heads run 1.78/1.46 valves and have larger chambers. Anything other than the 69 and 70 heads is pretty much a wash and not worth the time. __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

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January 23rd, 2007, 12:01 AM	#2
woody1 Enthusiast Join Date: Nov 2006 Posts: 559 iTrader: 0 reviews	equivalent to a gt40 head

January 23rd, 2007, 10:11 PM	#4
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906 iTrader: 0 reviews	I think 351W has 1/2" head bolts, 302 has 7/16. Other than that, it's a straight bolt on (no pun intended).

January 24th, 2007, 11:22 AM	#7
FastBack71 Enthusiast Join Date: Dec 2006 Posts: 587 iTrader: 0 reviews	like what 15 hp??? im excited to do this!!!

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