Are the 4.6's and 5.4's big blocks or small blocks?

Discussion in 'SN95 4.6L Mustang Tech' started by 1badII, Dec 8, 2003.

  1. The mod motors are wide because the height of the heads are huge since the cams sit on top.

    The V8's you speak of above from Ford are ALL 90 degrees. In fact, I can't think of any V8 (Ford, GM, Chrysler...) that isn't 90 deg. Not sure about the small V8s like the SHO and the LS for example.

    The term "big block" and "smal block" are old school terms and really don't apply to the modular motors.
  2. So what do they call the 351M?
  3. Its not a mod motor, because mod motor is the name ford gave to the newer ones because alot of the parts are interchangeable/or not much different so they can use some of the same dies and such during production to save money.

  4. This is not correct :bs:

    All Ford V8's, are 90 degree V engines.

    8 cyl engines have to be 90 or 180 degrees in order to get an even firing order without resorting to split rod journals on the crankshaft.

    6 cyl V engines such as the Duratec 2.5 & 3.0 and the Vulcan 3.0 are 60 degree engines.
  5. The 351M is bastard engine.

    At the end of 1974 Ford shut down production of the 351C engine and shipped the tooling to Australia (Those lucky SOB's).

    In a year Ford found it couldn't keep up with demand for 351W engines so it took the 400 block and put in a new crank and rods to shorten the stroke and reduce the displacement back down to 351 CID. They called this abomination the 351M.

    Stupidest thing Ford ever did was to discontinue the 351 Cleveland.
  6. The 289 & 302 have very similar blocks both with a 4.00" bore. The difference in displacement is due to the stroke.

    Same with the 429 / 460, they have the same block and same bore, just a different stroke.

    The Modular V8 Family has nothing to do with Mazda. The idea of the Modular family was that the same basic engine configuration could be made as a V6, V8, V8, or V12 using the same bore spacing and basic engine geometry. In addition different heads, SOHC, DOHC could be bolted onto the same blocks. Much of the same production tooling could be used on different engine models.

    The V6 version of the Mod motor never saw the light of day as 90 degree V's do not make for good V6 engines, too big, too heavy and requries split rod journals to get an even firing order.

    As you guys are aware, the V8 and V10 mod motors are the only ones that made it into production.
  7. Actually that is not quite corrcect.

    In 1962 the 406 was introduced. It is a pushrod engine. 4.13 bore x 3.78 stroke.

    In 1963 the bore was increased to 4.23" making it 425 CID, but Ford called it a 427.

    The 406 and 427 were intended as race car engines. They had solid lifters and used the famous side oiler block.

    In 1965 the 427 SOHC Cammer came out. It was never sold in a production car and is was never raced in NASCAR. NASCAR made a decision in 1965 to NEVER allow OHC engines. A decision is still sticks with today. You could buy a 427 Cammer as a crate engine at your local Ford dealer.

    The 428 was introduced in 1966. Since it's bore is bigger than its stroke, 4.13 x 3.98, you can't exactly call it a long stroke station wagon engine. In fact most of the famed 427 Shelby Cobras had 428 engines. You only got the 427 side oiler if you bought the race model of the Cobra. The street 427 Cobras came with 428 engines.

    A somewhat popular mod. for 427 engines is to put the 428 crank in it which gives you 447 CID and a lot more low end torque.
  8. What about GM's 4.3L V6?
  9. SHO engine is a Yamaha
  10. And your point is?
  11. that it is not a Ford Engine, also I will check to be sure but I don't believe all the engines are 90 deg v. Where do you get your info... now I am wondering If I am correct. I have not built many engines, but I have torn a lot down for others. I seems that most were about 60 deg v.
  12. Interesting... My buddy has one in his 79 Broncho.
  13. It may be built by Yamaha but there are quite a bit Fords with them in it. You must be tearing down a lot V6's then.
  14. I'm with you!

    I keep asking why Ford would want 2 different deck height blocks. Seems dumb to me! Different bores or strokes on the same block makes more sense.
  15. They're good truck engines. They make good low end torque.