How to time my 351 modified

Asked by Dec 01, 2015 at 05:46 PM about the 1993 Ford F-150

Question type: Maintenance & Repair

5 Answers

35,425

It is properly called a 351M. Modified Cleveland or 400 it is not. Do you have a timing light? Are you doing cam timing or ignition timing? Why are you messing with the timing? Repairs of some sort? From Wikipedia..........351M/400 naming convention confusion[edit] There exists debate as to what Ford intended the "M" designation of the 351M to refer to. Some claim the "M" stands for “Modified” - being modified from a 400 V8 with a shortened stroke - though others claim that the "M" refers to the Michigan Casting Center, where the 351M began production. There is also some who say that the "M" designation has no official meaning, and it was just Ford's way of distinguishing the 351M for the 351C and 351W.[28] Likewise, Ford's use of the 400 block in the creation of the 351M engine has resulted in the 400 mistakenly being referred to as the "400M" or "400 Modified." This is despite the 400 having been the design basis from which the "modified" 351M was derived and it was in production several years before Ford used the "M" designation. Further confusion arises from Ford printing "351M/400" on the emission stickers for the engine. The "351M/400" referenced the engine family, and some confused this with the engine name. This sticker also listed the engine displacement below the engine family. Ford's official name for the 400 V8 contains no additional designations - the proper nomenclature is simply "400."

1 out of 1 people think this is helpful.
18,875

351M, basically a de-stroked 400. I've always heard it referred to as "modified." I have a 75 Elite with one of these. Ford developed these to reduce the compression, a big concern in the era of unleaded low octane gas. A good resource for you to check out is: M-Block Ford V8 Workshop - http://grantorinosport.org/BubbaF250/history/history03.html

16,130

Why do you suspect the timing is off? If you do not have a timing light and a distributor wrench just bring it to a shop and ask them to check the timing. Probably will not cost more than the combined cost of the tools, if purchased.

35,425

I am pretty sure on those engines you have to disconnect the "spout" connector to check the ignition timing.

45

Haynes and Chiltons have put out good automotive repair manuals produced by make, model and year. Some manuals for older vehicles can still be found in auto part stores or online. Are you looking for the firing order?

Your Answer

Add photo

Related Questions

F-150

Looking for a Used F-150 in your area?

CarGurus has 207,755 nationwide F-150 listings starting at $1,000.

ZIP:

Search Ford F-150 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Ford F-150 Experts

#1 OJ
OJ
Reputation 6,720
#2 dandyoun
dandyoun
Reputation 4,140
#3 tennisshoes
tennisshoes
Reputation 2,470
View All

Related Models For Sale

Used GMC Sierra 1500
975 Great Deals out of 60,125 listings starting at $1,299
Used Dodge Ram 1500
501 Great Deals out of 13,070 listings starting at $1,495
Used Ford F-250
559 listings starting at $1,342
Used Ford Mustang
532 Great Deals out of 42,736 listings starting at $1,699
Used Ford Explorer
1,072 Great Deals out of 71,554 listings starting at $1,000
Used Ford Ranger
195 Great Deals out of 6,753 listings starting at $1,595
Used Jeep Wrangler
509 Great Deals out of 18,412 listings starting at $2,500

Used Cars For Sale

2017 Ford F-150 For Sale
4 Great Deals out of 83,301 listings starting at $17,710
2016 Ford F-150 For Sale
184 Great Deals out of 56,027 listings starting at $4,922
2015 Ford F-150 For Sale
214 Great Deals out of 7,514 listings starting at $18,296
2014 Ford F-150 For Sale
485 Great Deals out of 11,455 listings starting at $11,479
2013 Ford F-150 For Sale
656 Great Deals out of 13,986 listings starting at $8,450