HELP!!!!!!
Senior User
Joined: Mar 2009
Posts: 111
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do you have a square sticker on the side of your valve cover?....if you do and can read it then it should have the engine size printed on it....if not you will have to get the nubers off the block near the bell housing and then after you get those numbers, you will need to repost them on here and ask "numberdummy" what it means.....he can tell you any thing you need to know about any part number you can emagine....he knows his stuff...
Posting Guru
Joined: Jan 2009
Posts: 1,145
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The M stands for modified. The 351M is identical to the 400 except it was "modified" with a shorter stroke. The 400 has a 4" and the 351 has a 3.5". The numbers fudge a little if you do the math, the 400 actually has 402 CI.
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shamp
1973 - 1979 F-100 & Larger F-Series Trucks
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May 1, 2010 04:03 PM
