[DeTomaso] Which 351 in each year

Mark McWhinney msm at portata.com
Mon Jun 11 15:31:04 EDT 2007


DeTomaso was (in)famous for building production cars using whatever parts he
had laying around that day.  I cannot imagine that there was any real
consistency with whatever Ford engines he happen to have on hand.

FWIW, this is what I have in my early 71, #1512

www.portata.com/panteraadventure/images/PB093602.JPG




-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Michael Shortt
Sent: Monday, June 11, 2007 12:18 PM
To: List DeTomaso
Subject: [DeTomaso] Which 351 in each year

Just looking around and researching 351 engines.
Exactly which specific model came in the cars originally in each year.
If one believes the stated HP ratings, then most were "Boss 351" with 330
hp.

Here's the poop.


The 335 series was very different internally from the similar-looking
Windsor series. The 335 Cleveland used smaller 14 mm spark plugs in one of
two different cylinder heads, both with 2 valves per cylinder. The
*4V*heads had massive valves canted to the sides with a "poly-angle"
combustion
chamber. A novel feature is the heads are not straight - they are horizontal
in front and angled in the rear with an integrated twist. These covers are
secured with 8 bolts, as opposed to 6 on the Windsor.

A simple differentiator between the Windsor and Cleveland series is the
location of the radiator hose - the Windsor routed coolant through the
intake manifold, with the hose protruding horizontally, while the Cleveland
had a dry manifold with the radiator hose connecting vertically to a
separate timing chain cover.

Inside the block, large main bearing caps are specified for durability,
allowing 4-bolt mains on some engines. The oiling system has been widely
criticized but has not proven any less reliable than the Windsor line.

[edit<http://en.wikipedia.org/w/index.php?title=Ford_335_engine&action=edit&
section=2>
] 351 Cleveland *351 Cleveland engines*  Code Engine type Years Compression
Notes H 351C-2V 1970-1974 Low  M 351C-4V 1970-1971 High  R 351C-4V
"Boss 351<http://en.wikipedia.org/wiki/Ford_Boss_351_engine>
" 1971 High Very rare, solid lifters R 351C-4V HO 1972 Low Very rare, solid
lifters Q 351C-4V "Cobra-Jet" May 1971-1974 Low  *See also the
Cleveland-derived Boss
351<http://en.wikipedia.org/wiki/Ford_Boss_351_engine>and quite
different 351
"Windsor" <http://en.wikipedia.org/wiki/Ford_Windsor_engine#351W>*

The *351 Cleveland* was introduced in 1969 as Ford's new performance car
engine and was built through the end of the 1974 model year. It incorporated
elements learned on the 385
big-block<http://en.wikipedia.org/wiki/Ford_385_engine>series and the
Boss
302 <http://en.wikipedia.org/wiki/Ford_Boss_302_engine>, particularly the
poly-angle combustion chambers with canted valves and the thin-wall casting
technology.

Both a *4V* (4-barrel carburetor) performance version and a *2V* (2-barrel
carburetor) basic version were built, both with 2 valves per cylinder. The
latter had a different cylinder head with smaller valves, smaller ports, and
open combustion chambers to suit its intended applications.

Only the Q-code 351 "Cobra Jet" (1971-1974), R-code "Boss" 351 (1971), and
R-code 351 "HO" (1972) versions have 4-bolt mains although all 335 series
engines (351C/351M/400M) have space for them even in 2-bolt main form. The
main difference between 351W/351C/351M/400M engines is connecting rod length
and main bearing size. The 351/400M engines have the largest bearing size
and the tallest deck height while sharing the 429/460 bell
housing<http://en.wikipedia.org/wiki/Bell_housing>pattern. The 351C
engine has a medium main bearing size and shorter
connecting rods than the 351W and the 351/400M while retaining the SBF
bellhousing pattern. The 400M engine has the longest stroke of any SBF or
335 series engine.

All of the 351C and 351/400M engines differ from the 302/351W by having an
integrated timing cover casting in the front of the block to which the
radiator hose connects.

H-code
<http://en.wikipedia.org/wiki/Image:1973_Ford_Mustang_convertible_351-2V_Cle
veland.JPG>
<http://en.wikipedia.org/wiki/Image:1973_Ford_Mustang_convertible_351-2V_Cle
veland.JPG>
1973 H-code 2V 351 Cleveland

The majority of 351 Cleveland engines are H-code 2V (2-venturi carburettor)
versions with low compression. These were produced from 1970 through 1974
and were used on a variety of Ford models from compact to intermediate.

M-code

The M-code version was produced from 1970 through 1971. It used a high
11.1 compression
ratio <http://en.wikipedia.org/wiki/Compression_ratio> with "4V" quad-barrel
carburetors and the quench head-design 4V heads. Hydraulic lifters were also
specified, with the M-code producing about 300 hp (224 kW). 2-bolt main caps
were used along with a cheaper cast iron intake manifold.

1971 R-code (Boss 351) *See also Ford Boss 351
engine<http://en.wikipedia.org/wiki/Ford_Boss_351_engine>
*

The 1971 R-code "Boss 351" used higher compression (11.7:1) with the quench
head 4V heads, solid lifters, an aluminum intake manifold, and 4-bolt main
caps. It produced about 330 hp (246 kW).

1972 R-code

The R-code 351 Cleveland for 1972 was considerably different. It had reduced
compression for emissions compliance and used open-chamber heads. It had a
Hydraulic camshaft, however a four barrel carburetor was retained. It
produced 277 hp (207 kW) using the new SAE net system.

Q-code (Cobra-Jet)

The Q-code "351 Cobra Jet" version was produced from May 1971 through the
1974 model year. It was a low-compression design that included a special
intake manifold, solid camshaft, special valve springs and dampers, a 750
CFM 4300-D Motorcraft Carburetor, dual-point distributor, and 4-bolt main
bearing caps. It was rated at 266 hp (198 kW) (SAE net) for 1972 when
installed in the Mustang <http://en.wikipedia.org/wiki/Ford_Mustang>, 262 hp
in fullsize Fords and 248 hp in the Ford
Torino<http://en.wikipedia.org/wiki/Ford_Torino>and Mercury
Montego <http://en.wikipedia.org/wiki/Mercury_Montego>. The rating remained
266 hp for the Mustang and dropped to 246 hp (183 kW) for the intermediate
Ford and Mercurys for 1973. The 351 CJ was rated at 255 hp in 1974 and was
only installed in the Ford Torino
<http://en.wikipedia.org/wiki/Ford_Torino>,
Mercury Montego <http://en.wikipedia.org/wiki/Mercury_Montego> and the
Mercury
Cougar <http://en.wikipedia.org/wiki/Mercury_Cougar>.


-- 
Michael L. Shortt
Savannah, Georgia


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