351 H.o.
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Senior User
Joined: May 2004
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From: Northwest Indiana
351 H.o.
i acquired a 1984 F250 with a factory 351 HO under the hood. just wondering if this engine is rare as i can't recall seeing one before? it has a holley 4 BBL and is bone stock with all the smog still running on it. is this worth hanging on to or is it just an 80's gas guzzler? thanks
Postmaster
Joined: Dec 2003
Posts: 2,833
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From: Honkytonkville
GREAT motor....Wouldn't say rare though, we've got 2 at the shop, both in 80's pickups, we blocked the emissions on both and the motors are screamers, they love to run! We use one for hauling, have had 2 1/2 tons of gravel in the bed(yes 2 1/2 tons) along with another 6 tons on a trailer. Pulled it right along. Not quick by any means in that situation, but what motor is? lol. Does anyone know what makes these motors "HiPo"? Or this just a marketing scheme? The one in the hauler runs like it has little bit of compression to it, but it is stock so we don't really know and we've never taking a compression tester to it. Any help on this would be great! Sorry didn't mean to hijack there, but would appreciate the help any how.
Scott
Scott
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Senior User
Joined: May 2004
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From: Northwest Indiana
yeah i'm gonna gut the emissions on this one and i think it will run better. it seems the converter is plugged up and it certainly don't need the air pump!!! it just shocked me when i raised the hood and seen the aluminum air cleaner lid with the HO on it. didn't know they made such an engine or put it in a pickup. anybody know any horsepower ratings for this engine?
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
Yep that is it, otherwise it's a low compression smog motor same as everything else from that era. That said the stock exhaust system is brutally restrictive and if the original cat is still present it is long overdue for replacement.
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Laughing Gas
Joined: Dec 2012
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From: Toledo, Ohio
. '78 may have the wimpy 351M with 2 bbl. carb... or wimpy 400... my '78 F150 351M has an Emissions Exempt sticker on the engine (no EGR, air injection, or cats)... don't know about the vans... look in 335-series engines forum here for how to easily, inexpensively bump power way up on those...
Hotshot
Joined: Nov 2008
Posts: 15,014
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From: Semper Fi tell I die!
. '78 may have the wimpy 351M with 2 bbl. carb... or wimpy 400... my '78 F150 351M has an Emissions Exempt sticker on the engine (no EGR, air injection, or cats)... don't know about the vans... look in 335-series engines forum here for how to easily, inexpensively bump power way up on those...
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,709
Likes: 2,629
From: SE Florida
All Ford trucks with a 351 from 1983-1987 had this engine. So there were A LOT of them built.
The cam is the same cam that the Mustang GT ran.
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