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Small block or big block?
#1
A previous car if mine was a '95 GT that I swapped the 5.0L for a mild 393w and a Vortech supercharger. With a moderate cam, moderate boost, and low compression, I easily had 550hp to the rear wheels.
When it comes to my '73 Mach-1, I am torn between a built small block (currently a 4v Cleveland) or a big block (probably some variation of a 460). Seeing that I have no intention of tracking the car and am purely looking for a street car, would it be better to go with a big block or the small block?
I want it reliable for everyday use, run on 91 octane, with a little lope (camshaft), and have plenty of power to get out of its own way without having to wind the snot out of it.
I was initially thinking a 351c (or a 393/408) with a healthy cam and an Air Gap intake. But I'm also thinking of a 460 based motor. Either way, I will be using a TKO-600 or a T-56.
Thanks everyone.
Mike
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#2
I don't know much about big blocks, but when i do it's a ford 460!

HA honestly I have debated this myself and come to the conclusion that the money I would put into another engine and fabricating its simpler to just build what worked from the factory, on a street driven car i believe will be a much less hassle.
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#3
I have no expieance with the big block maybe BT or others will weigh in. However, add the following info into your decision. For a street car you also need some handling capability. The 351c weighs less than the big block so that is a plus for the handling. For a straight line drag strip car I'd definately go big.

[Image: 386_07_10_13_5_58_42.jpeg]
My Mustangs:
71 M-code Mach 1, Medium Blue/White Sport, 4R70W, 3L50, Factory Ram Air.
72 Q-code Mach 1, Pewter/Black Sport, 4-spd, 3L25.
65 Convertible, Britney Blue/White/White, more modified than original.
05 Convertible, Legend Lime/Tan/Tan, future classic??
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#4
Low compression '73 4V? Twin turbo. Big Grin

I decided to swap heads, cam it, and spin it for now. We'll see what the future holds. I always wanted to big block it, but decided on an all around car instead of just a drag machine.

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.
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#5
apples and oranges too me...but i do like the idea of a cleveland...Lighter but able to reach big block HP numbers with out too much trouble...I use to want a big block too and planned to dump my 4v cleveland for a 429 or 460....Till i realized how good my cleveland 4v could be with little mods....I would like to see some one putting a 390 hi po.. or 427 side oiler in oneWink..lol
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#6
The best bang for the buck that fits your criteria is the 460.

73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
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#7
I have yet to assemble it yet but I have a 460 bored .030 over and a t56 magnum I still need to rebuild my rear end into a 4.30:1, auto locked, 31 spline beast and the pro fit kit from american power train and mine is going to be a daily driver.

[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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#8
Build a Cleve, have the torque of a big block and the rpms of a small block. That's why I decided to stay with the 351 rather than swapping it with the 429 I have.

THE HOOFBEAT IS LOUDER THAN THE HEARTBEAT!!!!!
SINCE 1964


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#9
I have no experience with the big block maybe BT or others will weigh in. However, add the following info into your decision. For a street car you also need some handling capability. The 351c weighs less than the big block so that is a plus for the handling. For a straight line drag strip car I'd definitely go big.


+1
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#10
Go big block 460. They are cheap, plentiful and a plethera of after market parts. Cost wise you can build it just as cheap or cheaper and be ahead. If it is for street use mainly, then all the more to go big block. Torque is what you want and you can't beat a big block when it comes to that. With our cars its a bolt in either way. Good luck.
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