Rebuilding 351 C
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Originally Posted by scotv
I am planning on rebuilding my 351C to make 275 hp. Are roller rockers going to help my power gains?
I run roller rockers. Honestly they dont give you much power. But I wind my motor pretty high, so theres nothing wrong with a little more valve train stability.
also how much are you willing to spend?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
What year is the vehicle and motor? The 351C was never offered in trucks, cars only, so unless this has been swapped in you don't have a 351C. If you did have a "C" you probably wouldn't be looking for more power, they were 400hp motors in factory trim.
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From: Ottawa, Ontario
That's more like it. All the usual things work, upgrade the cam and exhaust and you'll pretty much have your power, though a 4bbl carb and intake will help as well. Compression on these smog motors was pretty low so if you're doing a complete rebuild try to get pistons to bump it up into the 9:1 range.
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Already swapped to Holley Pro-Jection. 21/2 inch true duals. Planning complete rebuild with shaved heads, electric fan. Did not know if roller rockers would help. Heard stock heads flow pretty good up to 5000 rpm.
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FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by scotv
Already swapped to Holley Pro-Jection. 21/2 inch true duals. Planning complete rebuild with shaved heads, electric fan. Did not know if roller rockers would help. Heard stock heads flow pretty good up to 5000 rpm.
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From: CANADA
Originally Posted by Conanski
You can either add 1.7 rockers to get more lift out of the stock cam, or upgrade the cam. These motors have pathetic little cams, and a decent upgrade won't cost much.
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Originally Posted by Conanski
. If you did have a "C" you probably wouldn't be looking for more power, they were 400hp motors in factory trim.
The 335 Series consisted of versions of the 351 and 400 blocks. It lasted from 1970 to 1975.
351 Cleveland
<li> canted-valve cyclinder heads.
bore and stroke of 4.00 X 3.50.
a light weight block to beat.
one of the most desirable V8 engines Ford had to offer.
a two barrel or four barrel setup.
From 1970 to 1971 the 351 boosted between 250 to 240 horsepower.
As time progress, the 351 Cleveland saw lessor horsepower until its' demise in 1975.
the 351 Cleveland four barrel came with dual exhausts, a higher compressions ratio, larger intake/exhaust valves and four bolt mains during the first year of production.
the 351 Windsor, which belongs to the 90 degree V8 family and bears no resemblance or connection to the 351 Cleveland.
351 CJ
Introduced in the fall of 1971
mostly of four bolt mains, however there are some with two bolt mains.
possessed a spread bore bolt pattern cast iron manifold
Autolite carb 4300-D
Horsepower varied from approximately 280 during the first year of production down to 265 by 1973.
351 Boss
Most desirable
only available in the 1971 Boss 351 Mustang
Four bolt mains
high nodular iron crankshaft
solid lifter camshaft with screw in studs
adjustable rockers
an aluminum four barrel intake
351 HO
In 1972, Ford rolled the 351 Boss over into the 351 High Output for the new year.
Slighltly less desirable, the 351 High Output used the spread bore bolt pattern cast iron manifold
Autolite 4300-D.
With a milder camshaft, the output of the 351 HO was about 275 horsepower.
351 M and 400
By 1975 the 351 Modified was issued with Cleveland heads
a two barrel carb.
hydraulic lifters.
a cast iron intake manifold.
a two barrel carb.
the 351 Modified and the 400 which was introduced since 1971, are virtually identical with very few exceptions.
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