bolt patterns

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May 27, 2001 | 11:45 PM

orangeford

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Laughing Gas

Joined: Aug 2000

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From: Eastern, Idaho

bolt patterns

Do 351 windsors have the same trans bolt pattern as a 351m during the late 70s? What about late 70s 351w and 90s 351w?

May 28, 2001 | 03:05 AM

Bill_Beyer

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From: PacNW

bolt patterns

[font size="1" color="#FF0000"]LAST EDITED ON 28-May-01 AT 04:06 AM (EST)[/font][p]Ws and Ms never had the same bolt pattern.

May 29, 2001 | 10:15 PM

brown 4x4

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From: Nebraska

bolt patterns

All 351W's have the small block pattern (300-6, 302) while all 351M's have the big block pattern (429, 460).

Jun 18, 2001 | 07:44 PM

dinosaurfan

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From: SW Michigan

bolt patterns

Guys we have to be careful with statements like 'all 351Ms' or the 351M 'never' came with whatever bolt pattern. The 351M started life with the 302/351 small bell pattern on the back. My 76 torino had a 351M with an FMX automatic tranny,. I found the small pattern when the engine was pulled because of a cracked block- apparently this was a common problem with the early Ms. A 77 351M replacement would not fit, it had the far more common big bell pattern. After some searching we found a 1975 400 that also had the small bell. I believe the frequent cracks were part of the reason that Ford changed the bell pattern on these engines. How many were produced with the small bell I do not know, if I had not seen it myself I would not have believed it, but there are a few of them out there. DF

Jun 18, 2001 | 10:24 PM

Bill_Beyer

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From: PacNW

bolt patterns

[font size="1" color="#FF0000"]LAST EDITED ON 18-Jun-01 AT 11:27 PM (EST)[/font][p]Both engines you had were 400 blocks cast in 1973. You may have had a 351M in your vehicle but it started life as a 400. So as I said before, 351Ms and 351Ws never had the same bellhousing bolt pattern.

Jul 19, 2001 | 05:06 AM

Octane_addict

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bolt patterns

Since we're on the topic of bolt patterns, I have this question from my son. Will a C-6 Bolt up to a 351m that has a fmx behind it? He wants to know before he drops it and finds he may have screwed up.