Hp figures

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Feb 4, 2002 | 09:42 PM

slikness

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From: Durham

Hp figures

May 31, 2002 | 10:06 PM

blaxuede

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From: Powell RIver Canada

Hp figures

I have a 351 C in my truck and have no idea what year cleveland it is or even what it came out of. But i was just wonderin how much horsepower a stock cleveland produces, I know the figures are different for different years because of emission laws and stuff, but what would the average Cleveland produce? I have a 2v, 2bbl cleveland, and i'm thinkin about goin to a 4bbl intake, how much hp increase would I be lookin at 5-10 hp?
I know somebody's gonna say it's not a cleveland because it's in a truck, but it's not the stock engine and it is a cleveland.

Jun 1, 2002 | 12:57 AM

335clevo

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Hp figures

You're right about the years varying, but your average 2 barrel 351 Cleveland should put out 200-250 horsepower. I'd say putting on a 4 barrel carby will increase power by more than 5 - 10 hp. I'd say it would give at least another 20 hp, maybe more. Extractors (headers) would give you a good bit more too. Actually if you replace your 2 barrel, cast iron exaust manifolds with the right combination of 4 barrel and extractors, your fuel milage should increase allong with the power,

335C

Jun 1, 2002 | 01:42 AM

blaxuede

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From: Powell RIver Canada

Hp figures

I was thinkin about gettin a set of headers, but buyin a brand new set of 351 C headers is a little too rich for my blood, and there's no guarantee they will clear my transfer case. I was gonna buy a set of 351 M headers for 75$, I know they'll bolt up , but again i'm not too sure about the clearance aspect. I'd love to have a set of headers....

Jun 1, 2002 | 05:54 AM

335clevo

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Hp figures

>I was thinkin about gettin a set of headers, but buyin a
>brand new set of 351 C headers is a little too rich for my
>blood, and there's no guarantee they will clear my transfer
>case.

What type of gearbox do you have? I am inclined to think that extractors should clear most F100 gearboxes, but I'm not sure.

I was gonna buy a set of 351 M headers for 75$, I
>know they'll bolt up , but again i'm not too sure about the
>clearance aspect. I'd love to have a set of headers....

As far as I know 351M's are 1" higher than 351C's, so I guess everything would be the same except the 351M extractors would hang about 1" lower on a 351C. That may cause problems, again I'm not sure.

335C

Jun 1, 2002 | 01:50 PM

blaxuede

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From: Powell RIver Canada

Hp figures

well I have a 78 F-100 custom cab on a shortbox frame with an NP435 tranny and Dana 21 Transfer case

Jun 1, 2002 | 11:32 PM

xyfalcon500

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Hp figures

Ford claimed 250hp from the early 351C 2v engines, but testing has shown that the figure was more like 210hp at the flywheel. Upgrading to a stock 2v 4bbl intake (Aussie only part sorry, but similar to the edelbrock 2v 4bbl intake) along with a 600 holley will give you around 25hp, without changing anything else! I got these figures from an old mag where a completely stock 2v motor had tests done to see what would work best. Whatever you do, DON'T put a 4bbl carb on your 2bbl intake with an adaptor plate, that was shown to do practically nothing at all.