help with 351 heads

84gtman · October 21st, 2009, 01:06 AM

hey guys i have an 84 302 that i got 351 heads for the heads are the same year as the motor what do i need to do to put them into the car?

F8L GT · October 21st, 2009, 01:07 AM

get bushings i believe since the bolts holes in a 351 head are bigger than the ones in the 302. not sure what else

MustangMatt96GT · October 21st, 2009, 01:08 AM

Originally Posted by F8L GT

get bushings i believe since the bolts holes in a 351 head are bigger than the ones in the 302. not sure what else

That should be the only thing...

F8L GT · October 21st, 2009, 01:08 AM

AFR HEAD BOLT BUSHING KIT - CJ Pony Parts, Inc.

84gtman · October 21st, 2009, 01:12 AM

couldnt i just use the same bolts for the 302 heads on the 351 heads... and would the intake off the 302 fit the 351 heads correctly?

F8L GT · October 21st, 2009, 01:15 AM

yes the intake will fit just fine. You can use the bolts from the 302 just get the bushings for them

84gtman · October 21st, 2009, 01:27 AM

ok the 351 head bolts wont fit the 302 block

F8L GT · October 21st, 2009, 01:35 AM

not they are too big. 351 head bolts I believe are 1/2" and the 302 are 7/16" if i remember correctly

84gtman · October 21st, 2009, 01:41 AM

you know if i have to time it differently of not

F8L GT · October 21st, 2009, 01:43 AM

time it according to the cam specs. You should be fine. I have a set of 302 heads on my 351.

84gtman · October 21st, 2009, 01:52 AM

why smaller heaDS ON a bigger block? what difference will the 351 heads do to the motor

F8L GT · October 21st, 2009, 01:56 AM

I did it because it was a budget build and There was only 2k miles on them

84gtman · October 21st, 2009, 02:05 AM

what will the 351 heads do to my motor?

84gtman · October 21st, 2009, 02:44 AM

how do these bushings go on by the way...

F8L GT · October 21st, 2009, 02:46 AM

the go into the hole the put the bolt through. they keep the head from moving because of the larger hole ones the head is installed

rasalibre · October 21st, 2009, 03:14 AM

351W heads and 302 head are exactly the same thing EXACTLY! the 1 and only thing different is the bolt size you have to have bushings to put 351W heads on a 302 and you have to drill out 302 heads for a 351 how do you not understand this?

F8L GT · October 21st, 2009, 03:23 AM

most are. some of the early early 351 heads had different size valves. I will have to wait till i get home to know exactly what years but they are rare now-a-days

84gtman · October 21st, 2009, 10:34 AM

so there wont be a power difference

October 21st, 2009, 01:06 AM	#1
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	help with 351 heads hey guys i have an 84 302 that i got 351 heads for the heads are the same year as the motor what do i need to do to put them into the car?

October 21st, 2009, 01:07 AM	#2
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	get bushings i believe since the bolts holes in a 351 head are bigger than the ones in the 302. not sure what else __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

October 21st, 2009, 01:08 AM	#4
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	AFR HEAD BOLT BUSHING KIT - CJ Pony Parts, Inc. __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

October 21st, 2009, 01:15 AM	#6
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	yes the intake will fit just fine. You can use the bolts from the 302 just get the bushings for them __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

October 21st, 2009, 01:35 AM	#8
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	not they are too big. 351 head bolts I believe are 1/2" and the 302 are 7/16" if i remember correctly __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

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October 21st, 2009, 01:12 AM	#5
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	couldnt i just use the same bolts for the 302 heads on the 351 heads... and would the intake off the 302 fit the 351 heads correctly?

October 21st, 2009, 01:27 AM	#7
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	ok the 351 head bolts wont fit the 302 block

October 21st, 2009, 01:41 AM	#9
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	you know if i have to time it differently of not

October 21st, 2009, 01:43 AM	#10
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	time it according to the cam specs. You should be fine. I have a set of 302 heads on my 351. __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

October 21st, 2009, 01:52 AM	#11
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	why smaller heaDS ON a bigger block? what difference will the 351 heads do to the motor

October 21st, 2009, 01:56 AM	#12
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	I did it because it was a budget build and There was only 2k miles on them __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

October 21st, 2009, 02:05 AM	#13
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	what will the 351 heads do to my motor?

October 21st, 2009, 02:44 AM	#14
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	how do these bushings go on by the way...

October 21st, 2009, 02:46 AM	#15
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	the go into the hole the put the bolt through. they keep the head from moving because of the larger hole ones the head is installed __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

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October 21st, 2009, 03:14 AM	#16
rasalibre Regular 1988 Mustang LX Coupe N/A Join Date: Nov 2008 Location: Salem, Oregon Posts: 216	351W heads and 302 head are exactly the same thing EXACTLY! the 1 and only thing different is the bolt size you have to have bushings to put 351W heads on a 302 and you have to drill out 302 heads for a 351 how do you not understand this? __________________ -Joe Alvarez

October 21st, 2009, 03:23 AM	#17
F8L GT Heavy Light Weight 2002 Mustang GT 12.80@106.19 Join Date: Jul 2008 Location: Michigan Posts: 2,791	most are. some of the early early 351 heads had different size valves. I will have to wait till i get home to know exactly what years but they are rare now-a-days __________________ Mineral Gray Club Member #3 261HP/299TQ *12s N/A, All stock long block!!* Hurst T-Handle For Sale

October 21st, 2009, 10:34 AM	#18
84gtman Newbie 1984 Mustang GT Join Date: Aug 2009 Location: Dallas, TX Posts: 18	so there wont be a power difference