how do i figer out what type of 351 V8 i have?

55

Asked by Apr 02, 2012 at 06:36 AM about the 1981 Ford F-150

Question type: Maintenance & Repair

need to figer out what type of C6 to buy, because of the differnt bellhouseings with the 351 windsor/modifed /cleveland

2 Answers

35

Now a 351 Windsor is really a slightly enlarged 289/302, as it's name implies it comes from Fords "Windsor" engine family (a.k.a. the 90-degree V engine family). The thin-wall cast SMALL BLOCK accepts regular sized spark plugs, uses a timing chain in the block, routes water through the intake manifold, features thin main-bearing caps, a very good oiling system, and uses the same heads for 2V & 4V versions. The heads are are small, utilizing in-line valves with relatively small ports. The valves are 1.78" intake and 1.54" exhaust, i.e. the same size as a 289/302. The valve covers are straight (front to rear), attached by 5 bolts, and when removed you can see 351 cast in the lifter valley. The small side-by side (in-line) valves are the dead give- away. The 351 Cleveland, on the other hand, belongs to Ford's 335 engine family. This thin-wall cast BIG SMALL BLOCK uses the smaller 14mm spark plugs, has a separate front cover (bolted to the block) housing the timing chain and routing water - so that water does not go through the intake manifold, features beefy main caps (wide enough to drill for 4-bolt mains), a poor oiling system, and uses different heads for 2V & 4V versions. The heads make all the difference and these fire breathing babies make this motor the legend it is. On the 4V, the valves are HUGE, measuring 2.19" intake and 1.7n" exhaust (don't remember exactly). Valves this large are only possible via a canted valve arrangement, forming what Ford refers to as a "poly-angle" combustion chamber. The valve covers are not straight - the front is flat and parallel to the ground, but a curve twists the rear parallel to the head. They are attached by 8- bolts and when removed, there is a 4 cast into the corner of the 4V and a 2 cast into the corner of the 2V (at least in 1970). The canted valves are the dead giveaway.

55

ok thanks, this helped alot i belive i have a 351 modified. not a windsor, my bolt paterns for the trans are the same a as a c6 for a 460 big block, the top bolts holes are 7 and a bit inchs apart so a big block configeration

Your Answer

Ford F-150 Experts

  • #1
    OJ
    Reputation
    8,930
  • #2
    dandyoun
    Reputation
    4,550
  • #3
    tennisshoes
    Reputation
    3,060
View All

Related Models For Sale

Used Ford Mustang
730 Great Deals out of 38,316 listings starting at $895
Used Ford F-250
477 listings starting at $6,694

Used Cars For Sale

2018 Ford F-150 For Sale
32,348 listings starting at $20,236
2017 Ford F-150 For Sale
120 Great Deals out of 80,203 listings starting at $17,990
2016 Ford F-150 For Sale
134 Great Deals out of 7,741 listings starting at $18,989
2015 Ford F-150 For Sale
293 Great Deals out of 10,715 listings starting at $14,999
2014 Ford F-150 For Sale
422 Great Deals out of 13,817 listings starting at $10,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.