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Author
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Topic: v6 to v8 swap questions?
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brubaker
Journeyman Posts: 47
From: b'ham, al
Registered: Apr 2004
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posted 10-22-2004 10:23 PM
 
I am currently taking the 250 out of my 69 coupe and replacing it with a 302. what other changes will i have to deal with as far as suspension, rear end, etc.? And will any of the v8 parts off a 71 fit my 69?
thanks ahead
brubaker
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-23-2004 01:00 AM
wait a V6 or I6. a 250 is a straight 6. the rear might hold up for a little while if you dont beat it . you need to change the entire front suspension. and steering. tie rods and such the control arms spindles everything even springs for the heavier motor. you didnt say anything about drivetrain this an auto or manual. if it is a manual then you need a 302 bell housing the tranny will work. if it is a three speed which i think it is if it is a stick. thats why i said the 7.25 rear will work. but you should upgrade to atleast an 8 inch . this is more for 66 i would assume it be mostly the same for your year. i dont see why you cant use the other parts from the car check to make sure im not positive------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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68 Coop
Gearhead Posts: 5847
From: Mesquite, NV. 89027
Registered: Oct 2004
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posted 10-23-2004 01:28 AM
It seems to me that when I was a kid, my Uncle had a 57 Ford that had a V6. He used to brag about out running some V8's. Am I tripping, or was it true?------------------
William 68 Coupe
Stock 289
Edelbrock 600/RPM Intake
Ignitor/Flamethrower
Thorley's with Da Bomb's
C4
2.79's out back(for now)
15"x7" AR ASTRO's(needin' new tires)
"Project Under Construction"
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-23-2004 02:02 AM
but i think a 250 is actully an inline 6 engine. i could be wrong------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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Toronado3800
Gearhead Posts: 1163
From: St. Louis, MO
Registered: Jul 2001
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posted 10-23-2004 04:15 AM
I know Ford used an inline 300 ci six in pick-ups not so long ago. It felt quite similar to 302 powered trucks of the time.
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-23-2004 09:29 AM
they used that motor (300 ci) up to like the mid 90s in rear wheel drive 150s. a buddy of mine had one. beat the hell out of it still ran until he was pulling a dock out of the water and something broke and it rolled into the lake------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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brubaker
Journeyman Posts: 47
From: b'ham, al
Registered: Apr 2004
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posted 10-23-2004 10:53 AM
sorry about the v6. it is a inline 250. my plans are to go restomod with the car as far as looks but it will be an everyday driver. that is why i went with the 302, not a whole lot of gas eating power. and i'm going to lower the car too so i was maybe thinking of leaving the front springs and seeing how much it weighs them down. or is there other reasons i should change the springs. thanks for help so far. please keep it coming.
brubaker
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-23-2004 04:28 PM
i think you will get alot of movement from the front end if you leave the 6 cyl springs in there. do what alot of other people do cut the v8 springs it lowers and makes the front end a bit more stiff. up to you if you dont like the feel of it switch them. ive heard people say you should change to the v8 springs bc the safety issue. adragon8u i belive still has his 6 cyl setup on his car with a v8 under the hood. but he received the car like that. like i said it is up to you. i actully want to cut the front springs a bit to lower the front end. but i think i want to purchase new leafs first to see how bad they are.------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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RonnieT
Gearhead Posts: 912
From: Port Allen, La. 70767
Registered: Jun 99
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posted 10-23-2004 10:29 PM
You can use the 6 cyl springs with a 302, it will sit a little low in the front, but will not cause any "movement" unless you have worn suspension parts.The only difference in a 6 cyl and V-8 front suspension is the springs, spindles, and the brakes. The best thing to do is find the spindles and brakes from a donor car or salvage yard and then rebuild the front suspension when you install them. The 6 cyl rear end will hold up for awhile, as long as you do not abuse it too bad. The suspension parts from a 71 will not fit on a 69. ------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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brubaker
Journeyman Posts: 47
From: b'ham, al
Registered: Apr 2004
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posted 10-24-2004 12:26 AM
thanks trashline and ronnieT! that pretty much answers my questions. i already have some spindles and disc brakes to change out.
i'll probably leave the springs in for now and if i don't like the way the look or feal i will change them out. thanks againbrubaker
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-24-2004 11:24 AM
not trying to step on feet, the movement i was talking about was bc the 6 cyl springs are ment for 6 cyl, they are ment for a smaller amount of weight. i figured when you put the v8 in it would lower the springs more bc of the weight. but i figured it would be a bit more bouncy of a ride then it usually is. if you go over alittle hill quick it would through the motor up and move up and done more, even though you could have brand new shocks. this isnt based on any experiment just my own opinion. i would change the springs out anyway if you have the v8 ones, if not then no big deal. and with the rear change the fluid with some fresh stuff and it should last youa little while . what year mustang do you have a 69?------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional) [This message has been edited by trashline (edited 10-24-2004).]
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-24-2004 11:36 AM
i apalogize , my 66 is a 6 cyl when you do a v8 conversion the steering components have to be whiched over. 67-69 are the same for 6 and 8 cyl. like ronnie t said spindles , brakes and springs. i always thought the entire suspension was different with control arms and such. thanks for the clarification ronniet------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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RonnieT
Gearhead Posts: 912
From: Port Allen, La. 70767
Registered: Jun 99
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posted 10-24-2004 08:43 PM
I am not trying to "step on any feet" either, but I hate to see recomendations that will cost people money that is not necessary, I know I don't have extra money to just throw away.The front of the vehicle will sit lower with the 6 cylinder springs and it will have a softer ride, but bounce is controlled by the shocks, not the springs. If you look at the spring chart in the NPD catalog you will notice that a 69 coupe with a 250 uses the same spring as a 69 coupe with a 302, Part#5310-3. When it is time to install the spindles would be a good time to go through the complete front end, buy all the wear parts and then take a weekend and replace them. If you see the springs are too soft, or it sits too low, then put a new set of springs in at that time. ------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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68 S-code GT
Gearhead Posts: 3835
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 10-24-2004 11:29 PM
Your 69 6cyl tie rods and linkages are the same as a V8s. The springs you have might work but may be soft from age. The 69 (67-68 are)spindles might also be the same needing only the brake parts along with the backing plates needing to be swapped from the 71. Your 71 brakes and spindles might just swap over, as the disc brake ones will. Your trans will also swap but the rear will not but your 69 rear should hold up for a while unless you beat the crap out of it. The rear brakes will be able to be swapped to any 8? rear (1967-70) you find for your car.------------------
Ed S. 68 S-code FB GT 4spd(now C6)/3.25 PS PDB
68 J-code(now 289) Cp Sprint"B" C4/3L00-9" PDB PS AC
99 F150 XLT Ext/cab, 4X4, 5.4L, 3L55 [This message has been edited by 68 S-code GT (edited 10-24-2004).]
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-25-2004 12:12 AM
brubaker goodluck on your swap. let us know how it handles and how you like the power.------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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Twirly Bird
Gearhead Posts: 226
From: Central PA
Registered: Aug 2004
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posted 10-25-2004 11:01 AM
There are some other incidentals that will annoy you with this swap. Not sure about your year, but with my '66 IL6 to 289 I've also had to find a wiring harness, accelerator linkage, engine mounts, radiator, starter, alternator brackets, etc... Good luck. I hope you have deep pockets  ------------------
Twirly Bird
1966 Mustang Convertible
IL6 to 289 Conversion - (Will this ever end?)
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brubaker
Journeyman Posts: 47
From: b'ham, al
Registered: Apr 2004
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posted 10-26-2004 08:15 PM
so lets see if i got this right.69' coupe currently w/a inline 250, 1 barrel, automatic transmission, stock suspension, stock rearend. swapping over to a 79'f100 302, 2 barrel,
auto trans current transmission- swap/a must
current springs- will work/ better if i swap
71' mach springs will work current steering and other susp.- will work/71' stuff will not current rearend- will work/ better if i swap
(is my rearend an 8' or 7.25'? how do i tell?) hey trashline. did you mean in your first post that the stock tranny will hook up to a 302 if i change the bell housing? thanks again guys!
brubaker
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brubaker
Journeyman Posts: 47
From: b'ham, al
Registered: Apr 2004
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posted 10-26-2004 09:01 PM
so lets see if i got this right.
69' coupe currently w/a inline 250, 1 barrel, automatic transmission, stock suspension, stock rearend.swapping over to a 79'f100 302, 2 barrel,
auto trans current transmission- swap/a must
current springs- will work/ better if i swap
71' mach springs will work current steering and other susp.- will work/71' stuff will not current rearend- will work/ better if i swap
(is my rearend an 8' or 7.25'? how do i tell?) hey trashline. did you mean in your first post that the stock tranny will hook up to a 302 if i change the bell housing? thanks again guys!
brubaker
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RonnieT
Gearhead Posts: 912
From: Port Allen, La. 70767
Registered: Jun 99
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posted 10-26-2004 09:03 PM
Brubaker, Yes if you change the bellhousing on teh transmission it will work, but I think the C-4 used behind the 6cyl is weaker than the one behind a V-8, they have less clutches. As far as the rearend look under the car and see if the rearend has a cover plate bolted on the back of it, if it does it is a 7 1/4. If it has a removable centersection it is an 8". I don't ever remember seeing a 6 cyl car with anything but a 7 1/4 though. ------------------
Ronnie
69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23
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trashline
Gearhead Posts: 2230
From: Levittown, Pa
Registered: Dec 2003
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posted 10-26-2004 10:45 PM
i know for a fact that if you have a three speed manual tranny it will bolt right up with a v8 bell housing. in 67 they switched from the 2.77 3 speed to a 3.03 which is actully the v8 three speed. this is the setup i switched to in my 66. you never did specify if you have a manual or automatic? with the rear i am pretty sure that you have the 7.25 all 6s came with them the only car i now of that came with a 8 inch and a six were the early mavericks, there could be others but they had a four lug 8 inch rear end. i know guys with rebuilt 7.25s with standing alot of hp from inline sixes. a 63 falcon with stock motor a turbo at i belive 12 psi and 50 hp shot of nos on a stock drivetrain. but if you plan to beat the hell out of some imports and chevys quite often then wait till this rear blows up or sell it and then buy the 8 inch you want with whatever center section you want. after just reading over you did say your switching to an auto trans from the truck. if possible use the trans from the truck. might as well try i dont know what type it is i am assuming a c4 , if it is then i am sure it will bolt right in. just pull the entire thing out of the truck and slide it right into your car dont even unbolt it. that way if what ronnie says about 6 cyl trans is true then youll have the v8 trans hooked up anyway. any other questions? also dont forget all the little stuff your going to need------------------
1966 mustang coupe
200ci, 3.03 3 speed tranny
holley weber two barrel conversion, msd 6a ignition, blaster 2 coil, pertronix, 2 inch exhaust to a glass pac, stock rear (3.20),ram air install complete (homemade)
white w/ black interior, soon be painted antique bronze with the R model apron and gt350 hood scoop (functional)
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Toronado3800
Gearhead Posts: 1163
From: St. Louis, MO
Registered: Jul 2001
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posted 10-27-2004 12:44 AM
My front suspension was soo soft from age I really feel the benefit whenever I change just a bushing. Mine started as a 289 car, and now has a 302. I couldn't imagine the weight of a big block pressing my ill designed fender lips due to my worn suspension..
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