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429 Engine swap
#1
red logo 
    Hello everyone.

I'm new to the forum, but I've found my home for me and my 73 Mach 1!

Here's the deal: I've got a 429 ready for rebuild and I'm gonna swap it out for the 302 that's in the stang.

Can anyone direct me to someone who has done a 429 swap into a 73 Mach 1?

I've read everything I can on doing it and I have just about every Mustang mag there is, but I'm still not sure on what this will all entail.

If anyone can help me out, I'd appreciate it.

Thanks,

Jeff
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#2
Let me say I have never done that swap but assuming you are staying with a similar tranny (C4 to C6) or the same 4 speed, assuming you have all the correct accessory brackets for the belts and the right pulleys and hoses, the only thing that jumps out to me are motor mounts and hooking up the exhaust to whatever you have. I'm sure other will chime in as to what else to consider. Aside from power you may notice the handling will not be for the better due to the heavier engine. Sad

With all the new power you should consider the rear spoiler flip too.

Vamach1 - 72 Sprint conv & 72 Mach1
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#3
bigpoppachief07;125006 Wrote:Hello everyone.

I'm new to the forum, but I've found my home for me and my 73 Mach 1!

Here's the deal: I've got a 429 ready for rebuild and I'm gonna swap it out for the 302 that's in the stang.

Can anyone direct me to someone who has done a 429 swap into a 73 Mach 1?

I've read everything I can on doing it and I have just about every Mustang mag there is, but I'm still not sure on what this will all entail.

If anyone can help me out, I'd appreciate it.

Thanks,

Jeff
welcome ,be sure to post in the introductions, if you havn 't already.All I can say is I bought a 351 car last year that had a 460 put in,the guy did some stuff right & wrong.What I"ve learned is ..you need big block coil springs,you need a trans. to back up the H.P. (mine is C6) don't use Crites long tube headers(they hang too low)mine have dents to prove it) engine mounts for big block(crites in mine)I don't know if the radiator for 302 is same as 351,but mine seems to cool ok. A 9 inch rearend is good for all that torq as well.Save lots of money for gas & tires .Tongue

[Image: 1_11_01_14_4_00_47.jpeg]
460 , Edelbrock Performer carb. + intake , 204 / 214 cam , Pertronix Flamethrower 2 billet dizzy + coil , Crites long tubes , C6 .









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#4
Welcome to the club, Jeff. As mentioned, I would post this thread in the Introductions area. It gets alot more traffic and more chances of finding someone who has done the swap.

Good luck - glad to have you here!

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
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#5
...what Kermit460 saidSmile!

I would add that as you begin to acquire the additional parts, you would do well to tell "parts" folks that you have a 1971 with 429CJ motor. Many parts such as mounts and stuff are readily available from the local "parts", i.e. Autozone, Napa, etc., if you utilize the 1971 mustang approach.

There are several Members on the Site who have or are putting 429/460 motors in their 1971 - 1973 Mustangs so you should be able to obtain answers to any specific questions that you may have as it relates to the install.

BT

Do the RIGHT thing.
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#6
There is a site dedicated to the factory 429 cars that has a ton of pics and part numbers that may be some help when you need oem part numbers....i just search for 429 supersite. Its not a forum community site, just lots of pics and part numbers. Btw, the 429 cars are rare and collectble and very cool. But imo the clevelands are better for our cars because they are lighter, which is important if you plan to drive a lot on the street. And they are just as rare in the muscle car world! And they can produce tons of power and sound great. Just a thought... But for straight line times and sheer brute torque the big brother to the 351c is an impressive engine for sure.
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#7
I am going to do the same to mine and there are plenty of big block cars on this forum so information should be easily obtained. BTW welcome to the forum from Arkansas
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#8
Beautiful car by the way & welcome from Fayetteville, NC. I can't tell you much about the 302 to 429 swap but I did an I6 to 289 swap and ran into a few issues...not insurmountable though. I think you'll probably need...at a minimum...

1). Frame to engine mounts..not just engine mounts
2). Possibly new radiator (depending on the in/out hoses) & capacity
3). Different trans. I doubt the C4 can handle the 429. With that being said, if you are going to marry up a trans make sure your flexplate/flywheel are correct. New trans = new trans cooler lines & vac line to modulator
4). You may need different front springs to handle the weight
5). Work through marrying up the exhaust with what you have
6). May need a new accelerator cable depending on length
7). Probably need some rubber gas line handy since you fuel pump is probably in a different location
8). Heater core lines should probably reach
9). Double check vac lines & tree to ensure you have enough inlets on the tree

-KR

-Former 70 & 72 Mustang Owner.
-69 Torino GT, Formal Roof, 351W, Edelbrock 600 cfm, Edelbrock 351W Performer RPM intake, headers, AOD trans, dual flowmasters w/H pipe, Pertronix II Billet, 3.5 TRACLOC g/r, 15" Magnum 500s, 100A alt, aluminum radiator, electric fan, Pro-car seats, mini-starter...owned since Dec 13.
-70 Mach 1, 351W, Edelbrock E-Street EFI, VHX instrument cluster, Hooker headers, dual flowmasters, Pertronix II, 15" Magnum 500s, 150A alt, aluminum radiator, dual electric fans, Pro-car seats, mini-starter
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#9
I was able to reuse my frame to isolator mount and bought the isolators and block to isolator brackets from mustangs unlimited look under 71 429 parts and I am going with an auto to 6 speed manual conversion still need the flywheel, clutch, pressure plate, bell housing, ect, ect, ect. It feels like a lot but she should be seeing the road in october if I don't hit any huge snags.

[Image: 2cossj6.png]
97 F150: wrecked, 96 Dodge 4x4: blown motor / donated to the base
88 Suburban 4x4 355 cid 8 inch lift: sold, 95 Celica 5 speed : sold
68 F750 391 cid : sold,  96 F350 7.3 diesel dually : sold
86 Chevy 1500 305 cid c1500: sold, 73 Mustang mach 1 466 cid 5 speed : under construction
89 F350 4x4 cummins swap : sold, 64 Dodge d600: gone
00 Excursion: traded, 72 Mustang mach 1 302: scrapped
73 Mustang coupe: scrapped, 73 ranchero gt
06 Honda crf 450x : sold, 04 Honda vtx 1800
88 Bronco xlt lariat: sold, 76 Charger: traded
95 F350 4x4: sold , 91 Crown Victoria 302: sold
02 Dakota: traded, 96 f250 powerstroke: parts truck
87 f700, 98 e350 powerstroke: sold
03 land rover: traded, 95 f350 dually: part out
95 f350 dually: traded, 94 f150 4x4: traded
97 f250: sold, 76 Maverick 302: sold
91 240sx rb25: sold, 86 firebird: sold
86 Trans Am: sold, 88 westernstar: sold
89 dodge d350: sold, 2000 Dakota 4x4: sold  
84 f350 3+3: sold, 90 bronco: partout
67 catalina, 64 chevy c60
64 jeep j200, 74 corvette stingray
79 Lincoln mark V, 2013 f350: goldilocks
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#10
I went from a 351c to 429 and all I had to really changed was the motor mounts , new bellhousing ,flywheel ,front coil springs and hooker headers(the only header available at the time and they do go under the front crossmember and hang down a bit). As far as parts like staters, water pumps ,ect do like Cobra3073 said and tell the parts house you have a 71 429 and you should be ok. Hope this helps some welcome to the site.

Jay
73 mach1
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