351 Cleveland Blocks
#1
The 351-C was in production from 1970-1974, so there are few block casting numbers to look for. Note that the 351-C is NOT the same as a 351/400-M or a 400-C. The first table just shows casting numbers. The second table shows technical information on the various blocks.

   

From the table below, note that the 289, 302, 351W, 351-C, 351/400M and 400-C all have a 4.00" bore. The displacement difference comes through the stroke. However, there are other significant block differences that are not apparent from just looking at the bore and stroke. Within a family, there are some similarities, but not complete similarity. For example, within the 335 family there are differences in the crank centerline to top of deck change. This results in differences in the intakes, connecting rods and pistons. The 351-C has its own heads that don't interchange with any other block outside the 335 family. The 351-C 2V, 4V and Austrailian heads, as well as the 351/400M and 400 heads, can all be used on any 351-C block as long as the intakes and exhausts are compatible. However, they are not all equal in performance. See the heads discussion for more information.

Since the bore spacing for all the small blocks (including the 351-W, 351-C, 400-C and 351/400M) is the same, you can get some interesting interchanges if you are willing to perform additonal machining, such as boring some additional water passage holes. A 351-C head can be put on a 351-W, called a Clevor. TRW sells special Clevor pistons. The canted valves in the Cleveland heads mean you can't use the Windsor pistons. The Boss 302 was, essentially, a 351 Cleveland, 4V head put on a 302. Any 351-C head can be used on a 302 with some adjustments to water passages (I have forgotten exactly whether you plug some, drill some or both) and special pistons.

The 400C has a taller deck height than the 351-C so it can accommodate the longer stroke. Since the 351M is basically a destroked 400M, it also has a taller deck height. A taller deck means wider too. You can see that the Crank Centerline to Top of Deck dimension for the 351/400-M and 400-C are nearly the same as the FE family (390, 427, 428) and 385 family (429/460). Therefore the 335 family is often considered a "Big Block" engine. The 351/400M and 400-C all require a "big block" bell housing. However, the 351-C has a smaller deck height and needs a small block bell housing. So, the 351-C is part of the 335 family, which is thought of as a big block family, but it has many attributes of the small block 90 degree V family. Since it is smaller, there is much less weight in the 351-C so the HP to weight ratio is very high.

   

1) This is for 1971-1972. Starting in 1973, height is 9.503"
2) I calculated this using the deck height, stroke and rod length of the 400C
3) Compression height is for 1961-1968. From 1969-1971 Comp. Height is 1.776". I don't know how compression ratio was maintained in this change because the deck height, stroke and rod length see to stay fixed for all years.
Reply


Possibly Related Threads…
Thread Author Replies Views Last Post
  All-Aluminum 351 Cleveland Engine Build Mach 1 Club 1 9,144 10-13-2017, 08:26 AM
Last Post: Steven Harris
  351 Cleveland Thermostat Steven Harris 2 12,883 03-21-2014, 02:06 PM
Last Post: Steven Harris
  351 Cleveland factory info djjsc 0 8,178 03-21-2014, 02:35 AM
Last Post: djjsc
  Mating 351 Cleveland Heads To 289/302/352W Blocks Mach 1 Club 0 7,706 01-27-2014, 11:00 PM
Last Post: Mach 1 Club
  351 Cleveland Engine Mustangs, Shelby and Cobra Data Mach 1 Club 2 14,141 01-16-2014, 01:11 AM
Last Post: Steven Harris
  The Perfect Cleveland Nov 1994 Super Ford Mach 1 Club 1 10,048 01-06-2014, 04:31 PM
Last Post: gxr02190
  Supercharging a carbureted 351 Cleveland Mach 1 Club 3 16,895 01-06-2014, 11:39 AM
Last Post: JTS71 Mach1
  351 Cleveland Confidential Mach 1 Club 0 7,655 01-06-2014, 04:57 AM
Last Post: Mach 1 Club
  351 Cleveland Superstock - old magazine article Mach 1 Club 0 7,791 01-06-2014, 04:54 AM
Last Post: Mach 1 Club
  351 Cleveland Engine Mach 1 Club 4 20,458 07-22-2013, 01:01 PM
Last Post: JTS71 Mach1

Forum Jump:


Users browsing this thread: 1 Guest(s)
[-]
Latest Threads
What's One More Iron In The Fire!
Last Post: fram lee666
03-18-2024 06:21 PM
» Replies: 125
» Views: 238165
"Jacobra"
Last Post: JTS71 Mach1
06-30-2023 11:13 PM
» Replies: 86
» Views: 150942
My old Queensland Ambulance
Last Post: JTS71 Mach1
06-30-2023 11:08 PM
» Replies: 5
» Views: 1713
New member from San Jose, CA
Last Post: JTS71 Mach1
05-09-2023 08:39 AM
» Replies: 12
» Views: 3974
Saving Seatbelts
Last Post: Jim
02-19-2023 10:23 PM
» Replies: 2
» Views: 9116
Sourcing new wheels
Last Post: JTS71 Mach1
01-25-2023 02:34 PM
» Replies: 1
» Views: 2005
Shaker Air Filter
Last Post: JTS71 Mach1
01-08-2023 02:24 AM
» Replies: 3
» Views: 1469
1971 Mach 1 parting out interior parts -...
Last Post: ylwhrse
12-22-2022 01:38 PM
» Replies: 0
» Views: 642
Painting
Last Post: Rare Pony
12-14-2022 06:24 PM
» Replies: 2
» Views: 1972
WELCOME ALL NEW MEMBERS INTRODUCE YOURSE...
Last Post: JTS71 Mach1
08-31-2022 01:36 PM
» Replies: 82
» Views: 157100
1970 mach 1 matching numbers
Last Post: Kstweeter
08-31-2022 10:31 AM
» Replies: 1
» Views: 1088
Brake booster/servo hose length
Last Post: JTS71 Mach1
08-23-2022 09:40 AM
» Replies: 7
» Views: 3013
New Member
Last Post: JTS71 Mach1
08-20-2022 11:18 AM
» Replies: 2
» Views: 1503
smooth window operation on 70 Mach
Last Post: CUSTOMMISER
08-15-2022 12:10 PM
» Replies: 2
» Views: 1482
Blinkers on solid
Last Post: busted21
08-09-2022 03:58 AM
» Replies: 14
» Views: 8732
Blinkers on solid when lights on.
Last Post: JTS71 Mach1
08-08-2022 12:06 PM
» Replies: 1
» Views: 1723
351 cj running hot
Last Post: busted21
08-08-2022 12:13 AM
» Replies: 5
» Views: 3419
Major Winter projects
Last Post: JTS71 Mach1
07-09-2022 05:12 AM
» Replies: 49
» Views: 21309
Happy Fathers Day!!!
Last Post: JTS71 Mach1
06-20-2022 02:34 AM
» Replies: 0
» Views: 1686
1969 Raven Black 390 Looking For
Last Post: mason1958
06-11-2022 09:48 AM
» Replies: 10
» Views: 15093

>