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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150



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  #1  
Old March 4th, 2013, 06:50 PM
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Default 84-87 351W H.O. Information

i thought i'd post this thread about the facts, and myths on the 351W HO that were built from 84-87..

I started reading a thread on another site.. and it had SO MUCH BAD INFO!!!!!

and the bad part is it's extremely simple... not a wild difference..

first... ratings...

84-87 HO.
hp 210@4000 rpm
tq 305 ft lb. @2800 rpm

1983–85 2 bbl stock
hp 150 DONT HAVE RPMS for some reason...
tq 280 ft lbs.



the Block and rotating assembly is the same for the HO as the regular windsor..

the Camshaft is one major difference.. the HO cam is based off a marine 351 grind.. it's fairly aggressive..

cam specs lift 444int./452exh. adv. dur 206int./221exh. on a 115 lobe separation



the Carb was a 600 Cfm 4 bbl with vacuum secondaries.. a holley if im not mistaken..

the Heads are also same between the 2.. 84 are D8 heads.. very very late 84 and after are E5's.. very smogged heads. huge combustion chambers..



so like i said above. the difference are minute but make a large difference.. if the HO had even E7's from the factory it woulda been around 230hp and 325 ft lbs.. the heads killed them..

it was like breathing in freely and breathing out through a straw..






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Old March 4th, 2013, 07:35 PM
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My pops has one in his 86 4x4 and its a great engine. You can ask it to do anything but be economical. Even without his slide in camper in it! Your are correct about the carb. Its a Holley 4180c. My Dad's now has an aftermarket Holley 650 on it and runs much better than stock without compromising what little economy it has. In fact its a touch better.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old March 4th, 2013, 07:58 PM
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I got avg 14-16 MPG with a 351w H.O. with 2bbl intake and carb in my old Bronco.
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Old March 5th, 2013, 12:07 AM
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just because more HP doesnt mean worse gas mileage...

it makes it easier to get the vehicle going and to speed means less load means less fuel used..

i had an 88 F150 that had a 84 351W HO swapped into it, and converted to the stock EFI, and it would ROAST the 31's i had on it with 3.08 gears.. and got decent gas mileage.. like 11 city and 15 highway with a C6 in it... had loads of power for a fairly stock engine..








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