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Classic Mustangs Talk General Discussions

General discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustangs. Discuss all non-technical topics related Vintage Mustangs here.

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Unread 01-22-2010   #1 (permalink)
venom800tt is offline GT Member

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Default How much HP/Trq doeas a stock 351 Cleveland makes???

Basically i got a friend with a new fully rebuilt engine and transmission for his 1970 Mustang. The engine is a 351 4v Cleveland, everything about the car is stock, he still have 1 tire spin when doing burnout. Anyway i just wanted to know the HP/Torque numbers that a stock 351 4v Cleveland makes and a 1/4 mile time as well. Theres a nice track here but their closed for winter and i was very curious what does the car can do on 1/4 mile.
Thing is we did a quick race just to see our cars and with my 07 V6 i was a nose ahead of him both from a full stop and a roll and we are both auto. Thats very strange. Anyone :?:
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Unread 01-22-2010   #2 (permalink)
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255 HP


i can see the V6 beating it,

it maybe a big V8, but it dont make that much power, and you gotta remember that was back in 70!! the times have changed technology is WAY better in the new V6, plus the 70 is WAY heavyer if im correct?

less tech, no comp.

not sure, but i also heard the HP was measured diffrent back then?
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Unread 01-22-2010   #3 (permalink)
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Quote:
Originally Posted by Stevan26 View Post
255 HP


i can see the V6 beating it,

it maybe a big V8, but it dont make that much power, and you gotta remember that was back in 70!! the times have changed technology is WAY better in the new V6, pus the 70 is WAY heavyer if im correct. Anyway there are so many factors that comes in play.

less tech, no comp.

not sure, but i also heard the HP was measured diffrent back then?
That makes sense, does 70 and 71 use the same engine because I saw a video on YouTube with a guy that put his 71 stock 351 Cleveland on dynojet and got around 300 hp and 380 torque if I remember.
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Unread 01-22-2010   #4 (permalink)
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Yes the horsepower was rated different. Early was with no accessories ( i.e-alternator, a/c, p/s etc) later is with. You're looking at about 600 lbs difference. That's like filling your car with 3 buddies and racing him. ( Be careful with that) Back in 2004 Mustangs and Fords magazine done an article with 2 Clevelands and a Windsor. The Boss 351 made 371 tq/395 hp the open chambered 351 C made 357tq/ 387hp. The Windsor was warmed up a little more and made 413tq / 427 hp. The cams were more radical than stock also..
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Unread 01-22-2010   #5 (permalink)
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Default How much HP/Trq doeas a stock 351 Cleveland makes???

hello venom800tt,
First - Do your racing at a track for safety sake. It is very serious to get busted on he streets. =

Enough of the sermon.

I own a 70 Mach with 351C stick and a 08 with 6 auto.

If I were to run the 2 cars, I am certain the 70 would take the new one.

You must consider that the 2007 is probably in better tune, but the Clev should
go better. I must say that for a 6 cyl, - our 2008 is pretty peppy.

The old one with 1 tire buring is because it ha a single track rear-end and not a posi.

Don't get me wrong - Both Cars can be made to go.
I got carried away in the Mach not too long ago and showed a ricer what Ford power can do. The Mrs. was not happy and I could have gotten in a lot of trouble.

Be patient, wait for the track to open. - - Print dad (yeah the old dude)
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Unread 01-22-2010   #6 (permalink)
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A 1970 4V 351C makes 300 horsepower at 5400 RPM's. The 351C is a racing bred engine. Throw some cash at it and it will scream. The stock crank will withstand turning at 8k and aftermarket forged cranks can do 10k plus. Just let it breath and it will run away from anything. The valves in a 4V cleveland head are HUGE. Larger than a 390 or 428 and about as big 429 valves. It was ment for mid to top end work not low down.
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Unread 01-22-2010   #7 (permalink)
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Like the boy's have been saying, the 351c is a monster when you get 5K and higher. thats when it starts making its true HP.

to answer your question though, if the car with the 351C had the right rear end gear, 3.8 - 3.9, it would blow the doors off the V6. The 351C would make baloney skins out the tires trying to get traction
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Unread 01-23-2010   #8 (permalink)
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Thanks "print dad" for the advice. Yes I always race in our track, I don't want my license to have negative point in it.

That's good to know that the 351c makes it's power on high rpm, I thought it's other way around. He probabley needs to get lik rpm gauge because the stock one doesn't have rpm.

This was very informative, thnx guys
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Unread 01-23-2010   #9 (permalink)
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Quote:
Originally Posted by venom800tt View Post
That makes sense, does 70 and 71 use the same engine because I saw a video on YouTube with a guy that put his 71 stock 351 Cleveland on dynojet and got around 300 hp and 380 torque if I remember.
Youtube lied to you . You will not get 300 RWHP on a dyno jet with a stock 351c.

As for a race with an 07 v6....when was the last time you tuned up your car? New plugs, wires, and points.
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Unread 01-23-2010   #10 (permalink)
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Don't go revving the piss out of the stock valve train on the C.
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Unread 01-25-2010   #11 (permalink)
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Quote:
Originally Posted by RF Mustang View Post
Like the boy's have been saying, the 351c is a monster when you get 5K and higher. thats when it starts making its true HP.
going off of this :

I have a 73 Convertible with a 351c, engine work had already been done to it and I have the dyno sheets..

HP starts to jump @ 3.5k rpm.

Peak HP comes at 5k rpm.. Peak TQ @ 4 thru 4.5k.

engine stays strong through 6.5k rpm.

HP drop after that comes @ 7k to 7.5
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Unread 01-25-2010   #12 (permalink)
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What have you done to your C?
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Unread 01-25-2010   #13 (permalink)
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Quote:
Originally Posted by 1978CobraII View Post
What have you done to your C?
If youre talking about mine..

the previous owner of the car had the work done.. I dont have all the details on what went into it but all the work was done by March Performance..

340HP / 371Tq
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Unread 01-25-2010   #14 (permalink)
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Quote:
Originally Posted by RF Mustang View Post
Like the boy's have been saying, the 351c is a monster when you get 5K and higher. thats when it starts making its true HP.

to answer your question though, if the car with the 351C had the right rear end gear, 3.8 - 3.9, it would blow the doors off the V6. The 351C would make baloney skins out the tires trying to get traction
I happen to have that set up in my Mach I with minor adjustments to the motor .....and well from a dead stop I have to let off of it, or at speed she'll break those thars loose

she'll get the dyno after it gets back from the paint shop
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Unread 02-02-2012   #15 (permalink)
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Quote:
Originally Posted by Print Dad View Post
hello venom800tt,

The old one with 1 tire buring is because it ha a single track rear-end and not a posi.


Be patient, wait for the track to open. - - Print dad (yeah the old dude)
so I have a traction lock, in the dirt, it spins all 2 tires, and once on the tarmac, it did whit both wheels to, but all other times, just one, whats the deal??
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