What engine is in you 71-73 Mustang?
Inline 6 Cylinder
2.35%
2
289 Small Block
0%
0
302 Small Block
22.35%
19
351 Small Block
58.82%
50
429 Big Block
1.18%
1
460 Big Block
11.76%
10
Other
3.53%
3
85 vote(s)
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What engine do you have?
#1
tach 
Just curious on what engine you have in your 71-73 Mustang? Hit the poll and feel free to post a comment if you like! The choices may reflect the base block in case you have a built up motor or stroker kit. This isn't any kind of scientific survey, I just wanted to see what the breakdown looks like! Multiple choice is allowed, but you can only vote once if you have several cars with the same engine as I do!

[Image: 1gq8uo.png]
1971 Mach 1 - 306cid/C4 Bright Yellow
"Just relax, I've got a friend named Felix who can fix anything!" ~James Bond
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#2
Well, I CURRENTLY have two different Ford big block Fords in my "73 Grandé and '73 Mach I. The Grandé has a .060 over 460 while the Mach I has a .020 over 428CJ.

Sometime pretty soon, the 428CJ will be replaced by a stroked 460 (545 - Forged 4.500 Crank in a 4-bolt main 429SCJ block).

BT

Do the RIGHT thing.
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#3
Somehow, I figure us 302 guys might be the minority!

[Image: 1gq8uo.png]
1971 Mach 1 - 306cid/C4 Bright Yellow
"Just relax, I've got a friend named Felix who can fix anything!" ~James Bond
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#4
(12-18-2010, 10:29 AM)rocketfoot Wrote: Somehow, I figure us 302 guys might be the minority!

I would bet that also. There is nothing wrong with that either ! We all know what kind of power these little guys are cranking out these days.The 71 -73 are just big cars with the best engine compartment of all the Mustangs,lot's of play room!
I have run the 351CJ factory . Then warmed up with intake carb and headers.Then went to a bassic 351 R code motor,open chamber heads with re-worked 12.1 pistons,hot custom ground solid lifter cam etc...(my favorite and fastest so far).Then I went the 429 / 460 route.I did not like that set up.I changed EVRYTHING to make it just like the 71 429 car.It was a touch quicker than the 351,but not as fast!My trap speeds went from 111mph down to 102 mph with the same basic et's.The 429 was easier to live with on the street,but the car handeled like a "pig".You had better plan your turns well in advance!
I am back to the 351,4 bolt block with flat tops and closed chamber 4v heads this time.I am not real happy with this one either.I have since determined that I am way off on my cam,and I have limited myself on the intake due to my own insistence that I run the factory ram air set up.This keeps me from running a Torker style / taller intake.I am stuck with a duel plane intake not good over about 5500 rpm.It is not the motors fault.


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[Image: 16kuyc0.jpg]
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#5
(12-18-2010, 11:55 AM)FastE Wrote:
(12-18-2010, 10:29 AM)rocketfoot Wrote: Somehow, I figure us 302 guys might be the minority!

I would bet that also. There is nothing wrong with that either ! We all know what kind of power these little guys are cranking out these days.The 71 -73 are just big cars with the best engine compartment of all the Mustangs,lot's of play room!
I have run the 351CJ factory . Then warmed up with intake carb and headers.Then went to a bassic 351 R code motor,open chamber heads with re-worked 12.1 pistons,hot custom ground solid lifter cam etc...(my favorite and fastest so far).Then I went the 429 / 460 route.I did not like that set up.I changed EVRYTHING to make it just like the 71 429 car.It was a touch quicker than the 351,but not as fast!My trap speeds went from 111mph down to 102 mph with the same basic et's.The 429 was easier to live with on the street,but the car handeled like a "pig".You had better plan your turns well in advance!
I am back to the 351,4 bolt block with flat tops and closed chamber 4v heads this time.I am not real happy with this one either.I have since determined that I am way off on my cam,and I have limited myself on the intake due to my own insistence that I run the factory ram air set up.This keeps me from running a Torker style / taller intake.I am stuck with a duel plane intake not good over about 5500 rpm.It is not the motors fault.

I felt the same about the ram air but when I got the numbers with the stock intake I changed my mind.I could of went with a performer rpm and still kept the ram air but I opted for the Air gap and I am rally happy with the results. I went from 385 hp to 435 just by putting on the Air gap instead of the stock intake. Of course the Air gap is to tall for the ram air but since I make more power without it I don't mind at all Big Grin

Eric


[Image: a58hgh.jpg]
DRIVE IT DON'T STORE IT!
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#6
351c here as well. A little different approach. Using 2v heads, larger valves and more port volume than any factory chevy head. Pocket ported, paid much attention to the guide area. Bronze guides, 1 piece stainless valves, roller rockers, guideplates and screw in studs. Performer intake with a 650 Holley vacuum secondary carb. Stock bore and stroke at present. New short block will be .030" over, light weight pistons, polished rods, floating pins. At present the engine has an Isky hydraulic RV cam. Plans are for a Comp hydraulic roller with the new short block.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
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#7
351c 4v stroked to 408. Details in my garage.
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#8
A well worn 351C.My plan is to stay Cleavland powered. Replace FMX with a C6 and install a GEAR VENDORS under/overdrive unit on tail of trans which will give me 6 speeds. I have installed N case trac loc with 3.50 out of a 73 Mach1. I'll be replacing the ring & pinion to 3.89 or 3.91 that will equate to around 3.20s in sixth gear running 265/60/15 BFG T/As. 65 mph in overdrive should be 2500 RPM or so.
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#9
351 4V that had a rebuild a long time before I bought it. I can't complain though as it seems quite similar to the rebuild I did on the previous car I had: Crane cam, lifters. Not sure if it has been bored or not but probably won't tear it apart 'til I need to. Lots of other things to spend $ on before I start into that.
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#10
(12-18-2010, 07:48 PM)mach71351c Wrote: A well worn 351C.My plan is to stay Cleavland powered. Replace FMX with a C6 and install a GEAR VENDORS under/overdrive unit on tail of trans which will give me 6 speeds. I have installed N case trac loc with 3.50 out of a 73 Mach1. I'll be replacing the ring & pinion to 3.89 or 3.91 that will equate to around 3.20s in sixth gear running 265/60/15 BFG T/As. 65 mph in overdrive should be 2500 RPM or so.


i had never heard of this product {gear vendors under/overdrive} sounds like something I could use.Was the installation easy?

Eric


[Image: a58hgh.jpg]
DRIVE IT DON'T STORE IT!
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